DESC:
Field of the invention
The present invention relates to a herbicide composition, more particularly to a liquid herbicide composition comprising an herbicidally active ingredient, an anionic surfactant and a non-ionic surfactant. The present invention also relates to process for preparation of said composition and use thereof.
Background of the Invention
Pesticides such as fungicides, insecticides and herbicides, are auxiliary agents for agriculture in order to protect and to increase the yield of crops. Improved weed or other undesired vegetation control has the potential to greatly improve crop yields. In order to control weed or other undesired vegetation use of herbicides is increasing in worldwide crop production. The herbicides have gained impetus resulting in overall economic growth. There is increasing demand for such herbicidal products that are stable, easy to handle, have lower worker exposure risks, environment friendly and have high levels of activity. Some herbicides, selectively control weeds without injury or damage to desirable crops. Some others, non-selectively control (or complete control) a broad spectrum of different types of plants/weeds. Depending on the specific needs, a number of active ingredients exist, which show very different chemical structures and behaviours.
It is often a challenge to prepare liquid compositions or solutions of these actives exhibiting a satisfactory stability and use profile.
US5491125 discloses liquid herbicidal formulations of glufosinate including various anionic surfactants and solvents. However, the compositions fail in solubility parameters resulting in haziness, solidification or layer separation at subzero temperatures. In few examples within the patent, the glufosinate compositions are prepared using readily available anionic surfactants, such as olefin sulfonic acid salts. Unfortunately, these examples fail to provide stable compositions, as the stability study in the patent indicates that the compositions solidify at subzero temperatures. These shortcomings highlight the need for significant improvements.
Accordingly, there remains a need for a liquid composition having at least one advantage including high storage stability at subzero temperature.
Object of the invention:
It is an object of the present invention is to provide a liquid herbicide composition comprising an herbicidally active ingredient, olefin sulfonic acid salts and a non-ionic surfactant.
Another object of the present invention is to provide a highly stable and effective liquid composition comprising an herbicidally effective active ingredient.
Yet, another object of the present invention is to provide a stable liquid composition comprising glufosinate its isomer or salts thereof, olefin sulfonic acid salts and a non-ionic surfactant.
Another object of the present invention is to provide a process for preparation of liquid composition comprising an herbicidally active ingredient, olefin sulfonic acid salts and a non-ionic surfactant.
Yet another object of the present invention is to provide a method for controlling weeds/undesired vegetation using present compositions.

Additional objects and advantages of the invention will be presented in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention, the objects and advantages being realized and attained by means of the methods, processes, and improvements disclosed in the present invention.

Summary of the invention:
According to an aspect of the present invention, there is provided a herbicide composition comprising:
a) at least one herbicidally effective active ingredient,
b) at least one anionic surfactant including an olefin sulfonic acid salt/s, and
c) at least one non-ionic surfactant

According to an aspect of the present invention, there is provided a liquid composition comprising:
a) at least one herbicidally effective active ingredient,
b) at least one anionic surfactant including an olefin sulfonic acid salt/s, and
c) at least one non-ionic surfactant.

According to another aspect of the present invention, there is provided a liquid composition comprising:
a) glufosinate, its isomers or salts thereof,
b) at least one olefin sulfonic acid salt,
c) at least one non-ionic surfactant, and
d) at least one organic solvent.

According to another aspect of the present invention, there is provided a liquid composition comprising:
a) L-glufosinate or salts thereof,
b) at least one olefin sulfonic acid salt,
c) at least one non-ionic surfactant, and
d) at least one organic solvent.

According to yet another aspect of the present invention, there is provided a process for preparation of liquid composition comprising mixing at least one herbicide; at least one anionic surfactant including olefin sulfonic acid salts; at least one non-ionic surfactant and at least one organic solvent to obtain the liquid composition.

According to yet another aspect of the present invention, there is provided a method of controlling weeds/undesired vegetation by applying to the plants or to their locus effective amount of present liquid composition comprising:
a) at least one herbicidally active ingredient,
b) at least one anionic surfactant including an olefin sulfonic acid salt, and
c) at least one non-ionic surfactant.

Detailed Description of The Invention
Those skilled in art will be aware that invention described herein is subject to variations and modifications other than those specifically described. It is to be understood that the invention described herein includes all such variations and modifications. The invention also includes all such steps, features, compositions and methods referred to or indicated in this specification, individually or collectively, and any and all combinations of any two or more said steps or features.
Definitions:
For convenience, before further description of the present invention, certain terms employed in the specification, examples are described here. These definitions should be read in light of the remainder of the disclosure and understood as by a person of skill in the art. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by a person of ordinary skill in the art. The terms used throughout this specification are defined as follows, unless otherwise limited in specific instances.
The terms used herein are defined as follows.
As used in the specification and the claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise.

The term "about" shall be interpreted to mean "approximately" or "reasonably close to" and any statistically insignificant variations therefrom. The term refers to a measurable value such as a parameter, an amount, a temporal duration, and the like and is meant to include variations of +/-15% or less, specifically variations of +/-10% or less, more specifically variations of +/-5% or less, even more specifically variations of +/-1% or less, and still more specifically variations of +/-0.1% or less of and from the particularly recited value, in so far as such variations are appropriate to perform in the disclosure described herein.

As used herein, the terms “comprising” “including,” “having,” “containing,” “involving,” and the like are to be understood to be open-ended, i.e., to mean including but not limited to.

The terms “preferred” and “preferably” refer to embodiments of the invention that may afford certain benefits, under certain circumstances. In an embodiment, the aspects and embodiments described herein shall also be interpreted to replace the clause “comprising” with either “consisting of” or with “consisting essentially of” or with “consisting substantially of”.
The use of any and all examples, or exemplary language (e.g., “such as”), is intended merely to better illustrate the disclosure and does not pose a limitation on the scope of the disclosure unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the disclosure as used herein.

While the disclosure has been described with reference to an exemplary embodiment, it will be understood by those skilled in the art that various changes may be made, and equivalents may be substituted for elements thereof without departing from the scope of the disclosure. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the essential scope thereof. Therefore, it is intended that the disclosure is not limited to the particular embodiment disclosed as the best mode contemplated for carrying out this disclosure, but that the disclosure will include all embodiments falling within the scope of the appended claims.

The term “glufosinate” refer to a racemic mixture of L-glufosinate and D-glufosinate. The term “glufosinate” shall be interpreted to mean glufosinate or its salts.
As used herein, the term “L-glufosinate” includes the L-isomer of Glufosinate, a salt or derivatives thereof. The term may also refer to an L-glufosinate wherein the content of L-glufosinate is 51% or greater, preferably 60% or greater and more preferably 80% or greater. Typically, the ratio of L-glufosinate: D-glufosinate can be in the range from about 80:20 to about 99.9:0.1 or 100:0.
“L-glufosinate” is also known as L-phosphinothricin or (S)-2-amino-4-(hydroxy(methyl)phosphonoyl)butanoic acid or Glufosinate-P and is used interchangeably throughout the specification. The term can generically refer to any form of L-glufosinate such as solvates, hydrates, anhydrous form, polymorph forms, pseudo polymorph forms, amorphous form or mixture thereof, and derivatives such as esters; and salts.
The term “L-glufosinate” shall be interpreted to mean L- glufosinate or its salts. The salts of L-glufosinate such as monosodium salt, disodium salt, monopotassium salt, dipotassium salt, calcium salt, ammonium salt, -NH3(CH3)+ salt, -NH2(CH3)2+ salt, -NH(CH3)3+salt, -NH(CH3)2(C2H4OH)+ salt, and -NH2(CH3)(C2H4OH)+ salt are included in the definition. The agronomically acceptable salts include L-glufosinate-ammonium, L-glufosinate-sodium, and L-glufosinate-potassium.
The term '% enantiomeric excess (% ee)' means the enantiomeric purity of a sample, that is, the percentage of one enantiomer that exceeds the other enantiomer in the sample. For example, the enantiomeric excess of L-glufosinate is the percentage of L-glufosinate that exceeds D-glufosinate in the glufosinate.
It should be noted that, as used herein, "derivative" or "analogue" of a molecule refers to a portion derived from or a modified version of the molecule.
The term “room temperature” unless stated otherwise, essentially means temperature in range of 20-35 °C.
The term “subzero temperature” refers to temperatures below the freezing point of water i.e., temperature below 0°C, preferably in the range of -15°C to 0°C.
The term “liquid herbicide composition” and “liquid composition” has same meaning and is used interchangeably, throughout the specification.
The term “isotropic liquid state” as used herein refers to a uniform and pourable liquid composition having physical stability at sub-zero temperature with no formation of precipitated solids or crystals or a liquid that does not exhibit phase separation.
According to an aspect of the present invention, there is provided a herbicide composition comprising:
a) at least one herbicide active ingredient,
b) at least one anionic surfactant comprising an olefin sulfonic acid salt, and
c) at least one non-ionic surfactant.

In an embodiment, there is provided a liquid composition comprising:
a) at least one herbicidally active ingredient,
b) at least one anionic surfactant including an olefin sulfonic acid salt/s, and
c) at least one non-ionic surfactant.

In an embodiment, the herbicidally active ingredient comprises of its salts, isomers or derivatives thereof.

In an embodiment, the herbicide or herbicidally active ingredient used is selected from the group comprising organophosphorous herbicides such as glufosinate, glufosinate-P, glyphosate, fosamine, amiprophos, amiprofos-methyl, bensulide or salts/isomers thereof; aliphatic acid herbicides such as pelargonic acid or salts thereof; amide herbicides such as diphenamid, napropamide, propanil, tetflupyrolimet, benzoylprop, fentrazamide, benzipram, acetochlor, alachlor, propisochlor, metolachlor, S-metolachlor, quinonamid, benzofluor, dimesulfazet, mefluidide or salts thereof; aromatic acid herbicides such as diflufenzopyr, dicamba, bispyribac, pyribenzoxim, aminopyralid, picloram, aminocyclopyrachlor, quinclorac or salts thereof; benzofuran herbicides such as benfuresate, ethofumesate or salts thereof; benzonitrile herbicides such as dichlobenil; bromobonil, chloroxynil; benzophenone herbicides such as methoxyphenone or salts thereof; benzothiadiazinone herbicides such as bentazone; benzyl ether herbicides methiozolin or salts thereof; botanical herbicides such as herbimycin or salts thereof; carbamate herbicides such as asulam, fenasulam, chlorpropham or salts thereof; cyclohexanedione oxime herbicides such as clethodim, cloproxydim or salts thereof; dinitroaniline herbicides such as pendimethalin or salts thereof; dinitrophenol herbicides such as dinofenate, bromofenoxim or salts thereof; diphenyl ether herbicides such as aclonifen, lactofen, fomesafen or salts thereof; diphenyl heterocycle herbicides such as fluridone, flurtamone or salts thereof; dithiocarbamate herbicides such as dazomet, metam or salts thereof; imidazolinone herbicides such as imazamox, imazapic, imazapyr, imazethapyr or salts thereof; inorganic herbicides such as ammonium sulfamate, borax, or salts thereof; isoxazole herbicides such as isoxacarbole, Isoxaflutole or salts thereof; isoxazolidinone herbicides such as clomazone, broclozone or salts thereof, isoxazoline herbicides such as pyroxasulfone, fenoxasulfone or salts thereof; N-phenyl heterocycle herbicides such as flurochloridone or salts thereof; N-phenylimide herbicides such as saflufenacil, flufenpyr, flumioxazin or salts thereof; N-phenyloxadiazolone herbicides such as oxadiazon, oxadiargyl or salts thereof; N-phenyltriazolinone herbicides such as sulfentrazone, carfentrazone or salts thereof; organochlorine herbicides such as o-dichlorobenzene or salts thereof; oxirane herbicides such as indanofan or salts thereof; oxyacetamide herbicides such as flufenacet or salts thereof; phenol herbicides such as cresol; phenoxy herbicides such as 2,4-D, 3,4-DA, MCPB, clomeprop, dichlorprop, clodinafop, fenoxaprop, metamifop, quizalofop or salts thereof; phenylcarboxylic acid herbicides such as chlorfenac, or salts thereof; phenyl ether herbicides such as diflufenican or salts thereof; phenylthiourea herbicides such as topramezone, pyraflufen, pinoxaden, pyraclonil or salts thereof; pyridazine herbicides; pyridazinone herbicides, pyridine herbicides, pyrimidinediamine herbicides, pyrimidinyloxybenzylamine herbicides, quaternary ammonium herbicides, quinone herbicides, alpha-thioacetamide herbicides, thiocarbamate herbicides, thiocarbonate herbicides, triazine herbicides, triazinone herbicides, triazole herbicides, triazolone herbicides, triazolopyrimidine herbicides, triketone herbicides, uracil herbicides, urea herbicides or any unclassified herbicides or combinations thereof.

In an embodiment, the herbicide used is glufosinate or isomers/salts thereof.

In an embodiment, the herbicide used is glufosinate-P or salts thereof.

In an embodiment, the composition comprises herbicide in an amount from about 1% w/w to about 70% w/w of the total weight of the composition.

In an embodiment, there is provided a liquid composition comprising
a) glufosinate, its isomers or salts thereof,
b) at least one anionic surfactant including an olefin sulfonic acid salt/s, and
c) at least one non-ionic surfactant.

In an embodiment, the liquid composition according to present invention is stable at subzero temperature and remains in isotropic liquid state.

In another embodiment, the liquid composition according to present invention is stable at temperature ranging from about -15°C to about 0°C and remains in isotropic liquid state.

In an embodiment, the glufosinate, its isomer or salts thereof is racemic glufosinate or salt thereof; or L-glufosinate or salt thereof.

In an embodiment, the composition comprises at least one a- olefin sulfonic acid salt/s.

In an embodiment, the composition comprises a- olefin sulfonic acid salt/s in an amount from about 0.1% w/w to about 30% w/w of the total weight of the composition.

In an embodiment, the composition comprises a- olefin sulfonic acid salt/s selected from (C8 to C26) a- olefin sulfonic acid salt/s or combination thereof.

In an embodiment, the composition comprises one or more of (C8-C26) a- olefin sulfonic acid salt/s, preferably (C10-C20) a- olefin sulfonic acid salt/s. In an embodiment, more preferably (C12-C18) a- olefin sulfonic acid salt/s.

The salts of (C8-C26) a- olefin sulfonic acid may be selected from potassium, sodium, ammonium and the likes.

In an embodiment, the composition comprises (C8 to C26) a- olefin sulfonic acid salt/s or combinations thereof, in an amount from about 0.1% w/w to about 30% w/w of the total weight of the composition.

In an embodiment, the non-ionic surfactant is selected from group comprising of alkylpolyglycosides, alcohol alkoxylate, alkyl glucamide, alkyl amine oxides having C8 to C20 carbon atoms, fatty acid methyl ester, sorbitan ester and ethoxylated sorbitan ester, ethoxylated alkylphenol, ethoxylated tristyrylphenol and alkyl amide, fatty alcohols having 10-24 carbon atoms with 0-60 EO and/or 0-20 PO and/or 0-15 BO in any order; fatty acid alkoxylates and triglyceride alkoxylates; fatty acid amide alkoxylates; alkylene oxide adducts of alkynediols; sugar derivatives such as amino sugars and amido sugars; polyacrylic and polymethacrylic derivatives; polyamides such as modified gelatins or derivatized polyaspartic acid; surfactant polyvinyl compounds such as modified polyvinylpyrrolidone (PVP); polyol-based alkylene oxide adducts; polyglycerides and derivatives, or combinations thereof.

In an embodiment, at least one of the non-ionic surfactants is selected from those that remain liquid at room temperature.

The combination of a liquid non-ionic surfactant, olefin sulfonic acid salt/s and appropriate solvent used in the composition ensures the uniformity of composition at subzero temperature, thereby maintaining the liquid composition in stable isotropic liquid state.

In an embodiment, the non-ionic surfactant used is selected from alkylpolyglycosides, alcohol alkoxylate, alkyl glucamide, alkyl amine oxides having C8 to C20 carbon atoms and the likes.
In an embodiment, the composition comprises non-ionic surfactant in an amount from about 0.1% w/w to about 30% w/w of the total weight of the composition.

In an embodiment, there is provided a liquid composition comprising
a) glufosinate, its isomers or salts thereof,
b) at least one a- olefin sulfonic acid salt/s, and
c) at least one non-ionic surfactant selected from alkyl polyglucoside, alkyl glucamide or alkyl amine oxide.

In an embodiment, the composition further comprises a solvent.

In an embodiment, the solvent is selected from an organic solvent, water or combination thereof.
In an embodiment, there is provided a liquid composition comprising:
a) at least one herbicidally active ingredient,
b) at least one anionic surfactant including olefin sulfonic acid salts,
c) at least one non-ionic surfactant; and
d) at least one organic solvent.

According to another aspect of the present invention, there is provided a liquid composition comprising:
a) at least one organophosphorous herbicide, isomers or a salts thereof,
b) at least one olefin sulfonic acid salt,
c) at least one non-ionic surfactant, and
d) at least one organic solvent.

In an embodiment of the present invention, there is provided an aqueous liquid composition comprising:
a) at least one organophosphorous herbicide, isomers or salts thereof,
b) at least one olefin sulfonic acid salt,
c) at least one non-ionic surfactant, and
d) at least one organic solvent.

The composition further comprises water.

According to another aspect of the present invention, there is provided a liquid composition comprising
a) glufosinate, its isomers or a salt thereof,
b) at least one olefin sulfonic acid salt,
c) at least one non-ionic surfactant; and
d) at least one organic solvent.

In an embodiment the organic solvent is selected from the group comprising of glycols and their derivatives; alcohols; or combinations thereof.

The glycol and its derivative is selected from group comprising of propylene glycol, dipropylene glycol, polypropylene glycol, monoethylene glycol, diethylene glycol, polyethlene glycol 300, 1-methoxy-2-propanol, butyl cellosolve, or combinations thereof, can be used.

The alcohol is selected from group comprising of methanol, ethanol, propanol, isopropanol, tetrahydrofurfuryl alcohol and/or combinations thereof, can be used.

In an embodiment, the organic solvent used is selected from
a) propylene glycol,
b) combination of propylene glycol and diethylene glycol,
c) combination of propylene glycol and butyl cellosolve,and
d) combination of propylene glycol and polyethylene glycol;

In an embodiment, the solvent used is propylene glycol.
In an embodiment, the solvent used is a combination of propylene glycol and diethylene glycol.

In an embodiment, the combination of propylene glycol and diethylene glycol is used in weight ratio of about 1:1 to about 7:1.

In an embodiment, the solvent used is combination of propylene glycol and Butyl cellosolve.

In an embodiment, the combination of propylene glycol and butyl cellosolve is used in weight ratio of about 1:1 to about 10:1.

In an embodiment, the solvent used is combination of propylene glycol and polyethlene glycol.

In an embodiment, the combination of propylene glycol and polyethlene glycol is used in weight ratio of about 1:1 to about 5:1.

In an embodiment, the composition comprises from about 1% w/w to about 40% at least one organic solvent of the total weight of the composition.
In an embodiment, there is provided a liquid composition comprising:
a) glufosinate, its isomer or salts thereof,
b) at least one a- olefin sulfonic acid salt/s,
c) at least one non-ionic surfactant selected from alkyl polyglucoside, alkyl glucamide or alkyl amine oxide, and
d) at least one organic solvent selected from group comprising of glycols and their derivatives, alcohols, or combinations thereof.

In an embodiment, there is provided a liquid composition comprising
a) glufosinate, its isomers or salts thereof,
b) at least one a- olefin sulfonic acid salt/s,
c) at least one non-ionic surfactant selected from alkyl polyglucoside, alkyl glucamide or alkyl amine oxide, and
d) organic solvent selected from group comprising of selected from
i) propylene glycol
ii) combination of propylene glycol and diethylene glycol;
iii) combination of propylene glycol and butyl cellosolve;
iv) combination of propylene glycol and polyethlene glycol.

In an embodiment, the liquid composition comprises racemic glufosinate or salts thereof.
In another embodiment, the liquid composition comprises L-glufosinate or salts thereof.

According to another aspect of the present invention, there is provided a liquid composition comprising
a) L-glufosinate or a salt thereof,
b) at least one olefin sulfonic acid salt,
c) at least one non-ionic surfactant, and
d) at least one organic solvent.

According to an embodiment, there is provided a liquid composition comprising
a) L-glufosinate or a salt thereof;
b) at least one a- olefin sulfonic acid salt/s,
c) at least one non-ionic surfactant selected from alkyl polyglucoside, alkyl glucamide or alkyl amine oxide, and
d) at least one organic solvent selected from group comprising of glycols and their derivatives; alcohols; or combinations thereof.

In another embodiment, the liquid composition comprises L-glufosinate ammonium.
According to an embodiment, there is provided a liquid composition comprising
a) L-glufosinate ammonium;
b) at least one olefin sulfonic acid salt;
c) at least one non-ionic surfactant selected from alkyl polyglucoside, alkyl glucamide or alkyl amine oxide, and
d) at least one organic solvent selected from group comprising of glycols and their derivatives; alcohols; or combinations thereof.

In an embodiment, the composition may further comprise additional anionic surfactants.

The anionic surfactants are selected from anionic derivatives of fatty alcohols having 10-24 carbon atoms in the form of ether carboxylates, sulfonates, sulfates, and phosphates, and their inorganic salts (e.g., alkali metal salts and alkaline earth metal salts) and organic salts (e.g., salts based on amine or alkanolamine); anionic derivatives of copolymers consisting of ethylene oxide (EO), propylene oxide (PO) and/or butylene oxide (BO) units, in the form of ether carboxylates, sulfonates, sulfates, and phosphates, and their inorganic salts (e.g., alkali metal salts and alkaline earth metal salts) and organic salts (e.g., salts based on amine or alkanolamine); derivatives of alkylene oxide adducts of alcohols, in the form of ether carboxylates, sulfonates, sulfates and phosphates, and their inorganic salts (e.g., alkali metal salts and alkaline earth metal salts) and organic salts (e.g., salts based on amine or alkanolamine); derivatives of fatty acid alkoxylates, in the form of ether carboxylates, sulfonates, sulfates and phosphates, and their inorganic salts (e.g., alkali metal salts and alkaline earth metal salts) and organic salts (e.g., salts based on amine or alkanolamine); alkyl ether phosphate, alkyl sulfate and its salts, alkyl sulfosuccinate mono ester and diester salts, or combinations thereof.

In an embodiment, the composition may further comprise a cationic surfactant or a zwitterionic surfactant.

The cationic surfactants or zwitterionic surfactants may be selected from alkylene oxide adducts of fatty amines, quaternary ammonium compounds having 8 to 22 carbon atoms (C8-C22), surface-active zwitterionic compounds such as taurides, betaines and sulfobetaines, or combinations thereof.

According to an embodiment of the present invention, the liquid composition may optionally comprise further customary formulating assistants (excipients) such as solvents, inert materials, such as stickers, wetters, binders, stabilizers, dispersants, emulsifiers, penetrants, preservatives, fillers, carriers and colorants, and pH modifiers (buffers, acids and bases) or viscosity modifiers (e.g., thickeners), and optionally also defoamers.
In an embodiment, the present composition according to present invention may comprise additional herbicidally active ingredient.
In an embodiment, the additional herbicidally active ingredient used is selected from group comprising of organophosphorous herbicides; aliphatic acid herbicides; amide herbicides; aromatic acid herbicides; benzofuran herbicides; benzonitrile herbicides; benzophenone herbicides; benzothiadiazinone herbicides; benzyl ether herbicides; botanical herbicides; carbamate herbicides; cyclohexanedione oxime herbicides; dinitroaniline herbicides; dinitrophenol herbicides; diphenyl ether herbicides; diphenyl heterocycle herbicides; dithiocarbamate herbicides; imidazolinone herbicides; inorganic herbicides; isoxazole herbicides; isoxazolidinone herbicides; isoxazoline herbicides; N-phenyl heterocycle herbicides; N-phenylimide herbicides; N-phenyloxadiazolone herbicides; N-phenyltriazolinone herbicides; organochlorine herbicides; oxirane herbicides; oxyacetamide herbicides; phenol herbicides; phenoxy herbicides; phenylcarboxylic acid herbicides; phenyl ether herbicides; phenylthiourea herbicides; pyridazine herbicides; pyridazinone herbicides, pyridine herbicides, pyrimidinediamine herbicides, pyrimidinyloxybenzylamine herbicides, quaternary ammonium herbicides, quinone herbicides, alpha-thioacetamide herbicides, thiocarbamate herbicides, thiocarbonate herbicides, triazine herbicides, triazinone herbicides, triazole herbicides, triazolone herbicides, triazolopyrimidine herbicides, triketone herbicides, uracil herbicides, urea herbicides or any unclassified herbicides or combinations thereof.

In an embodiment, the present composition according to present invention may comprise additional herbicidally active ingredient selected from group comprising of, but not limited to, imidazolinone herbicides, organophosphorous herbicides, phenoxy herbicides and the like.
In an embodiment, the additional herbicidally active ingredient is imidazolinone herbicides selected from imazamox, imazapic, imazapyr, imazethapyr or salts thereof; organophosphorous herbicides selected from glyphosate, fosamine, amiprophos, amiprofos-methyl, bensulide or salts thereof; or phenoxy herbicides selected from 2,4-D, 3,4-DA, MCPB, clomeprop, dichlorprop, clodinafop, fenoxaprop, metamifop, quizalofop or salts thereof.
In an embodiment, the additional herbicide is imidazolinone herbicide such as imazamox, imazapic, imazapyr, imazethapyr or salts thereof.
In an embodiment, the additional herbicide is imazethapyr ammonium.
In an embodiment, the additional herbicide is selected from organophosphorous herbicides such as glyphosate, fosamine, amiprophos, amiprofos-methyl, bensulide or salts thereof.
In an embodiment, the additional herbicide is glyphosate isopropyl ammonium.
In an embodiment, the additional herbicide is phenoxy herbicides such as 2,4-D, 3,4-DA, MCPB, clomeprop, dichlorprop, clodinafop, fenoxaprop, metamifop, quizalofop or salts thereof.
In an embodiment, the additional herbicide is 2,4-D sodium.
In an embodiment, the composition optionally, comprises from about 0.1% w/w to about 20% w/w at least one additional herbicide of the total weight of the composition.

According to an embodiment, there is provided a liquid composition comprising
a) glufosinate, its isomer or salts thereof,
b) an additional herbicide selected from imazethapyr, glyphosate, 2,4-D or salts or derivatives thereof,
c) at least one olefin sulfonic acid salt,
d) at least one non-ionic surfactant selected from alkyl polyglucoside, alkyl glucamide or alkyl amine oxide,and
e) at least one organic solvent selected from group comprising of glycols and their derivatives; alcohols; or combinations thereof.

In an embodiment of the present invention, the liquid composition comprises:
a) about 1% w/w to about 70% w/w glufosinate, its isomer or salt thereof,
b) about 0.1% w/w to about 30% w/w at least one olefin sulfonic acid salt,
c) about 0.1% w/w to about 30% w/w at least one non-ionic surfactant, and
d) about 1% w/w to about 40% at least one organic solvent.
In an embodiment of the present invention, glufosinate is selected from racemic glufosinate or salts thereof; or L-glufosinate or salts thereof.
In an embodiment of the present invention, the liquid composition comprises:
a) about 1% w/w to about 70% w/w L-glufosinate or salt thereof;
b) about 0.1% w/w to about 30% w/w at least one olefin sulfonic acid salt;
c) about 0.1% w/w to about 30% w/w at least one non-ionic surfactant; and
d) about 1% w/w to about 40% at least one organic solvent.
In an embodiment of the present invention, L-glufosinate is L-glufosinate ammonium.

According to an embodiment, there is provided a liquid composition comprising:
a) about 1% w/w to about 70% w/w glufosinate, its isomer or salts thereof,
b) about 0.1% w/w to about 20% w/w an additional herbicide selected from imazethapyr, glyphosate, 2,4-D or salts or derivatives thereof,
c) about 0.1% w/w to about 30% w/w at least one olefin sulfonic acid salt,
d) about 0.1% w/w to about 30% w/w at least one non-ionic surfactant selected from alkyl polyglucoside, alkyl glucamide or alkyl amine oxide,and
e) about 1% w/w to about 40% at least one organic solvent selected from group comprising of glycols and their derivatives; alcohols; or combinations thereof.

According to yet another aspect of the present invention, there is provided a process for preparation of liquid composition.

In an embodiment of the present invention, there is provided a process for preparation of a liquid composition comprising mixing at least one herbicidally active ingredient; at least one anionic surfactant including olefin sulfonic acid salts; and at least one non-ionic surfactant to obtain said composition.

In an embodiment of the present invention, there is provided a process for preparation of a liquid composition comprising mixing glufosinate, its isomers or salts thereof; at least one anionic surfactant including olefin sulfonic acid salts; and at least one non-ionic surfactant to obtain said liquid composition.

In an embodiment, the process comprises a step of adding at least an organic solvent.

In an embodiment, the liquid composition according to present invention is aqueous based liquid formulation selected from group comprising of soluble liquid, emulsion in water, microemulsion, emulsifiable concentrate, suspension concentrates, and the likes.

In an embodiment, the liquid composition according to present invention is soluble liquid formulation.

In an embodiment, the composition according to present invention maintain uniformity in its properties such as flowability, pourability, viscosity, etc., at sub-zero temperatures.

In an embodiment of the present invention, there is provided a process for preparation of a liquid composition comprising mixing at least one herbicidally active ingredient, its salt/s, isomer/s or derivative/s thereof; at least one anionic surfactant including olefin sulfonic acid salts; at least one non-ionic surfactant and at least a solvent to obtain the liquid composition.

In an embodiment of the present invention, there is provided a process for preparation of a liquid composition comprising mixing glufosinate, its isomer or salts thereof; at least one anionic surfactant including olefin sulfonic acid salts; at least one non-ionic surfactant and at least a solvent to obtain the liquid composition.

In an embodiment, the process is carried out at temperature ranging from 15°C to 60°C.
In another embodiment, the process is carried out at temperature ranging from 25°C to 50°C.

In an embodiment, at least one of herbicidally active ingredient/s is glufosinate, its isomer or salt thereof.

In an embodiment, racemic glufosinate, or salt is used.
In another embodiment, glufosinate-P, or salt is used.

In another embodiment, the mixing of glufosinate, its isomer or salts thereof; anionic surfactant/s including olefin sulfonic acid salts; non-ionic surfactant/s and a solvent is carried out in any sequence.

According to an embodiment, the process for preparation of liquid composition comprises steps of
i) adding anionic surfactant/s including olefin sulfonic acid salts; non-ionic surfactant/s and a organic solvent to obtain a mixture;
ii) mixing the said mixture at temperature ranging from 25°C to 50°C; and
iii) adding glufosinate, its isomer or salts thereof and water to obtain a composition according to present invention.

In an embodiment, the liquid composition according to present invention is aqueous based liquid composition selected from group comprising of soluble liquid, emulsion in water, microemulsion, emulsifiable concentrate, suspension concentrates, and the likes.

In an embodiment the composition prepared according to the present invention is soluble liquid composition.

According to yet another aspect of the present invention, there is provided a method of controlling weeds/undesired vegetation by applying to the plants or to their locus effective amount of present composition comprising
a) at least one herbicidally active ingredient,
b) at least one anionic surfactant including olefin sulfonic acid salts, and
c) at least one non-ionic surfactant.

In an embodiment, the herbicidally active ingredient is racemic glufosinate, or salts thereof.

In an embodiment, the herbicidally active ingredient is glufosinate-P, or salts thereof.
In an embodiment, there is provided a method of controlling weeds/undesired vegetation by applying to the plants or to their locus effective amount of present composition comprising
a) glufosinate, its isomer or salts thereof;
b) at least one anionic surfactant including olefin sulfonic acid salts; and
c) at least one non-ionic surfactant.

In an embodiment, glufosinate the glufosinate is L-glufosinate ammonium.

The composition according to present invention have effective herbicidal activity against a broad spectrum of economically important monocotyledonous and dicotyledonous harmful plants. The active substances also act efficiently on perennial weeds which produce shoots from rhizomes, rootstocks or other perennial organs and which are difficult to control. In this context, it does not matter whether the substances are applied before sowing, pre-emergence or post-emergence.
Examples of weed species on which the herbicidal compositions act efficiently are, from amongst the monocots, Echinochloa spp., Setaria spp., Digitaria spp., Brachiaria spp., Panicum spp., Agropyron spp., wild cereal forms and Sorghum spp., but also Alope curus spp., Avena spp., Apera spica venti, Lolium spp. and Phalaris spp., Poa spp., and Cyperus species and Imperata. In the case of the dicotyledonous weed species, the spectrum of action extends to species such as, for example, Chenopodium spp., Amaranthus spp., Abutilon spp., Ipo moea spp., Polygonum spp., Xanthium spp. and Equisetum, but also Anthemis spp., Lamium spp., Matricaria spp., Stellaria spp., Kochia spp., Viola spp., Datura spp., Chry Santhemum spp., Thlaspi spp., Pharbitis spp., Sida spp., Sinapis spp., Cupsella spp., Ambrosia spp., Galium spp., Emex spp., Lamium spp., Papaver spp., Solanum spp., Cirsium spp., Veronica spp., Convolvulus spp., Rumex and Artemisia.
In an embodiment, the composition according to present invention effectiently controls weeds from Chenopodium spp., such as Chenopodium album (Lamb’s quarter).
In an embodiment, the composition according to present invention efficiently controls weeds from Digitaria spp., such as Digitaria sanguinalis.
In view of the above, it will be seen that the several advantages of the disclosure are achieved, and other advantageous results are attained. Although the present disclosure has been disclosed in full, it will be understood that numerous additional modifications and variations could be made thereto without departing from the scope of the disclosure. The embodiments may be combined together for better understanding of the disclosure, without departing from the scope of the disclosure.

In another embodiment, alternative or multiple embodiments of the disclosure disclosed herein are not to be construed as limitations. Each embodiment can be referred to and claimed individually or in any combination with other embodiments of the disclosure. One or more embodiments of the disclosure can be combined together to exhibit the teaching of the invention, without departing from the scope of the disclosure.

EXAMPLES
The following examples are presented to provide what is believed to be the most useful and readily understood description of procedures and conceptual aspects of this invention. The examples provided below are merely illustrative of the invention and are not intended to limit the same to disclosed embodiments. Variations and changes obvious to one skilled in the art are intended to be within the scope and nature of the invention.

Example 1
L-glufosinate ammonium (200g/l) composition
Table 1
Ingredients Amount in % w/w
L-Glufosinate ammonium (a.i) 18.50
Propylene Glycol 18
a-olefin sulfonic acid salt 13
Alkyl polyglucoside 18
Alkyl ether phosphate 3.5
Water Q.S.
Total 100

To the formulation vessel was added propylene glycol, a-olefin sulfonic acid salt and other surfactants such as alkyl polyglucoside and alkyl ether phosphate, the mixture was then stirred at a temperature ranging from 30°C to about 45°C to obtain a solution. To this solution was then added L-glufosinate under agitation, followed by addition of water. The mixture was stirred for another about 300 to 360 minutes at said temperature to get a clear solution. The solution was then filtered to get final product, i.e., soluble liquid formulation according to present invention. The formulation obtained was clear and no phase separation was observed at 25°C and 54°C after 14 days as per CIPAC guidelines (MT 46.3) indicating composition is stable. Sub-zero stability test was done by keeping samples at -5°C for 14 days as per CIPAC guidelines (MT 39.3).

General process for preparation of a soluble liquid formulation according to the present invention:
Number of formulations were prepared, using following general process and the formulations are presented in table 2, 3, 4 and 5.
Process:
To the formulation vessel was added solvent/s, surfactant/s and olefin sulfonic acid salt/s and the mixture was stirred at a temperature ranging from 30 °C to about 45°C to obtain a solution. To this solution was then added active ingredients under agitation, followed by addition of water. The mixture was stirred for another about 300 to 360 minutes at said temperature to get a clear solution. The solution was then filtered to get final product, i.e., liquid formulation according to present invention. The formulation obtained was clear and no phase separation was observed at 25°C and 54°C after 14 days as per CIPAC guidelines (MT 46.3) indicating composition is stable. Sub-zero stability test was done by keeping samples at -5°C for 14 days as per CIPAC guidelines (MT 39.3).

Inventors of present invention succeeded in formulating a stable composition by using the specific combination of glufosinate, its isomers or salts thereof with a-olefin sulfonic acid salts, non-ionic surfactant/s and organic solvent/s. The optimum concentration of adjuvants as well as solvents which led to a stable composition has been arrived at by experiments as exemplified below.

Example 2
L-glufosinate ammonium (200g/l)
Composition was prepared in accordance with the general process described above.
Table 2
Ingredients Amount in % w/w
L-Glufosinate ammonium (a.i) 18.5
Propylene Glycol 12
Diethylene glycol 4
a-olefin sulfonic acid salt 13
Alkyl polyglucoside 18
Lauryl ether sulfate sodium salt 3
Water Q.S.
Total 100

The formulation remained clear and stable, with no phase separation observed at both 25°C and 54°C after 14 days, in accordance with CIPAC guidelines (MT 46.3). Additionally, the sub-zero stability test, conducted by storing samples at -10°C for 14 days as per CIPAC guidelines (MT 39.3), showed that the composition remained in isotropic liquid state without any phase separation or solidification.

Example 3
L-glufosinate ammonium (150g/l)
Table 3
Ingredients Amount in % w/w
L-Glufosinate ammonium (a.i) 13.5
Propylene Glycol 14
Butyl cellosolve 2
a-olefin sulfonic acid salt 13
Alkyl polyglucoside 15
Alkyl ether phosphate 2.5
Water Q.S.
Total 100

Example 4 to 12:
Table 4 provides examples of composition according to the invention.
Compositions were prepared in accordance with the general process by combining the components listed in amounts as % weight/weight of concentrate composition.
Table 4
Ingredients Example No.
4 5 6 7 8 9 10 11 12
L-Glufosinate ammonium (a.i) 25.77 25.77 25.77 25.77 25.77 25.77 25.77 25.77 --
Glufosinate ammonium (a.i) -- -- -- -- -- -- -- 25.77
Propylene Glycol 14 14 17 17 13.5 12 14 14 14
Diethylene glycol 5 5 5 5 5 5 5 5 5
a-olefin sulfonic acid salts 7 10 12 12 13 15 13 13 13
Alkyl polyglucoside 15 14 15 15 20 18 15 18 18
Ethoxylated alcohol 7.5 -- 7.5 -- -- -- -- -- --
Alkyl ether phosphate 3 7.50 -- 7.5 2.5 3.5 5.5 3.5 3.5
Water Q.S. Q.S. Q.S. Q.S. Q.S. Q.S. Q.S. Q.S. Q.S.
Total 100 100 100 100 100 100 100 100 100
Stability at 25°C & 54°C Stable Stable Stable Stable Stable Stable Stable Stable Stable
Stability at -5°C Stable Stable Stable Stable Stable Stable Stable Stable Stable
* Stability at 25°C & 54°C after 14 days as per CIPAC guidelines (MT 46.3) indicating composition is stable.
* Stability at -5°C after 14 days as per CIPAC guidelines (MT 39.3) (Sub-zero stability test

Example 13 to 24:
Table 5 provides examples of composition according to the invention.
Compositions were prepared in accordance with the general process by combining the components listed in amounts as % weight/weight of concentrate composition.
Table 5
Ingredients Example No.
13 14 15 16 17 18 19 20 21 22 23 24
L-Glufosinate ammonium (a.i) 18.50 18.5 18.5 18.5 18.5 18.5 18.5 13.5 13.5 -- -- --
Glufosinate ammonium (a.i) -- -- -- -- -- -- -- -- -- 18.5 13.5 25.77
Propylene Glycol 14 14 17 17 14 12 12 14 12 14 14 14
Diethylene glycol 5 5 5 5 4 4 4 -- -- 5 -- 5
Butyl cellosolve -- -- -- -- -- -- -- 2 -- -- -- --
Polyethylene glycol 300 -- -- -- -- -- -- -- -- 5 -- 5 --
a-olefin sulfonic acid salts 7 10 12 12 15 15 13 13 12 13 13 13
Alkyl polyglucoside 15 14 15 -- -- -- 18 15 15 15 15 18
Ethoxylated alcohol 7.5 -- -- 7.5 -- -- -- -- -- -- -- --
Alkyl glucamide -- -- -- -- 7.5 -- -- -- -- -- -- --
Alkyl amine oxide -- -- -- -- -- 15 -- -- -- -- -- --
Alkyl ether phosphate 3 7.50 -- -- -- -- -- 2.5 3.5 5.5 3.5 3.5
Sulfosuccinate -- -- -- -- 3 3 -- -- -- -- -- --
Alkyl Sulfates -- -- -- 2 -- -- -- -- -- -- -- --
Alkyl benzene sulfonates -- -- -- -- -- -- 3 -- -- -- -- --
Water Q.S. Q.S. Q.S. Q.S. Q.S. Q.S. Q.S. Q.S. Q.S. Q.S. Q.S. Q.S.
Total 100 100 100 100 100 100 100 100 100 100 100 100
Stability at 25°C & 54°C Stable Stable Stable Stable Stable Stable Stable Stable Stable Stable Stable Stable
Stability at -5°C Stable Stable Stable Stable Stable Stable Stable Stable Stable Stable Stable Stable
*Quantities in above table is provided in weight percentages
* Stability at 25°C & 54°C after 14 days as per CIPAC guidelines (MT 46.3) indicating composition is stable.
* Stability at -5°C after 14 days as per CIPAC guidelines (MT 39.3) -Sub-zero stability test

Example 25 to 28:
Table 6 provides examples of soluble liquid composition according to the invention wherein more than one active ingredient is used.

Compositions were prepared in accordance with the general process by combining the components listed in amounts as % weight/weight of concentrate composition.
Table 6
Ingredients Example no.
25 26 27 28
L-glufosinate ammonium (a.i) 15.3 15.3 15.3 15.3
Imazethapyr ammonium (a.i) 3.75 3.75 - -
Glyphosate Isopropyl ammonium (a.i) - - 3.75 -
2,4-D sodium (a.i) - - - 3.75
Propylene Glycol 14 14 14 14
Diethylene glycol 5.0 5.0 5.0 5.0
Alkyl polyglucoside 21.6 21.6 21.6 21.6
Alkyl ether phosphate 5.50 5.50 5.0 6.0
a-olefin sulfonic acid salts 18.0 9.0 18.0 18.0
Ethoxylated alcohol - 9.20 - -
Water Q.S. Q.S. Q.S. Q.S.
Total 100 100 100 100
Stability at 25°C & 54°C Stable Stable Stable Stable
Stability at -5°C Stable Stable Stable Stable
*Quantities in above table is provided in weight percentages
* Stability at 25°C & 54°C after 14 days as per CIPAC guidelines (MT 46.3) indicating composition is stable.
* Stability at -5°C after 14 days as per CIPAC guidelines (MT 39.3) -Sub-zero stability test

Example 29
L-glufosinate ammonium (211g/l)
Soluble liquid composition was prepared in accordance with the general process described above.
Table 7
Ingredients Amount in % w/w
L-Glufosinate ammonium (a.i) 18.7
Propylene Glycol 12
Diethyl glycol 5
a-olefin sulfonic acid salt 15
Alkyl polyglucoside 18
Alkyl ether phosphate 3.5
Water Q.S.
Total 100

The formulation remained clear and stable, with no phase separation observed at both 25°C and 54°C after 14 days, in accordance with CIPAC guidelines (MT 46.3). Additionally, the sub-zero stability test, conducted by storing samples at -10°C for 14 days as per CIPAC guidelines (MT 39.3), showed that the composition stayed as an isotropic liquid without any phase separation or solidification.

Comparative example 1 & 2:
Comparative examples 1 and 2 correspond to formulations 20 and 21 as described in US Patent 5,491,125, which utilize a-olefin sulfonic acid salts. Stability studies indicate that these two formulations solidify at -5°C i.e., they are not stable at sub-zero temperature and hence, are not preferred.

Example 30
Bio-efficacy trial data:
I. Field trials were carried out for determination of efficacy of liquid composition according to the present invention against Chenopodium album (Lamb’s quarter).
Experimental details:
Sr No Particular Details
1 Crop Non cropped area
2 Type of Nozzle Flat Fan
3 Water Dilution 450 Litre/ha
4 Treatment Dose 275 g a.i/ha
5 Average temperature during application Minimum :20 °C
Maximum: 30°C

Methodology & Observations:
4 composition (Example 6, 7 & 8) of 280g/L L-glufosinate-ammonium were tested against selected weeds. Weed plants were evaluated on 5th, 10th and 15th days after treatment (Table 4), at which time-point, burn down effect was observed in regions treated with the liquid composition of (Example 2, 9, 10 & 11) comprising a-olefin sulfonic acid salts, non-ionic surfactant (Alkyl polyglucoside) and organic solvents (Propylene Glycol and Diethylene glycol).

Example No. Percent weed control against Chenopodium album (Lamb’s quarter)
5 DAT 10 DAT 15 DAT
6 85 93 86
7 75 90 80
8 80 96 90
* Percent weed control against Chenopodium album (Lamb’s quarter) provided in % control * DAT: Days after treatment
II. Field trials were carried out for determination of efficacy of liquid composition according to the present invention against Digitaria sanguinalis
Sr No Particular Details
1 Crop Non cropped area
2 Type of Nozzle Flat Fan
3 Water Dilution 200 Litre/ha
4 Treatment Dose 358 g a.i/ha
5 Average temperature during application Minimum :10 °C
Maximum: 30°C

Methodology & Observations:
2 composition (Example 4 & 5) of 280g/L L-glufosinate-ammonium were tested against selected weeds. Percent biomass reduction was evaluated on 9th day after treatment (Table 5), at which time-point, burn down effect was observed as high as 94% in Digitaria sanguinalis.
Table 5
Composition of Example No. Percent biomass reduction (9 DAT)
Digitaria sanguinalis
4 94
5 92

,CLAIMS:
1. A liquid composition comprising:
a) glufosinate, its isomers or salts thereof;
b) at least one anionic surfactant including an olefin sulfonic acid salt; and
c) at least one non-ionic surfactant.

2. The composition as claimed in claim 1, wherein the liquid composition is stable at subzero temperature and remains in isotropic liquid state.

3. The composition as claimed in claim 1, wherein the glufosinate is racemic glufosinate, or salt thereof; or L-glufosinate or salt thereof.

4. The composition as claimed in claim 1, wherein the glufosinate is L-glufosinate ammonium.

5. The composition as claimed in claim 1, wherein the composition comprises at least one a- olefin sulfonic acid salt.

6. The composition as claimed in claim 1, wherein the a- olefin sulfonic acid salt/s selected from (C8 to C26) a- olefin sulfonic acid salt/s or combination thereof.

7. The composition as claimed in claim 1, wherein the composition comprises (C8 to C26) a- olefin sulfonic acid salt/s or combination thereof, in an amount from about 0.1% w/w to about 30% w/w of the total weight of the composition.

8. The composition as claimed in claim 1, wherein the non-ionic surfactant is selected from group comprising of alkylpolyglycosides, alcohol alkoxylate, alkyl glucamide, alkyl amine oxides having C8 to C20 carbon atoms, fatty acid methyl ester, sorbitan ester and ethoxylated sorbitan ester, ethoxylated alkylphenol, ethoxylated tristyrylphenol and alkyl amide, fatty alcohols having 10-24 carbon atoms with 0-60 EO and/or 0-20 PO and/or 0-15 BO in any order; fatty acid alkoxylates and triglyceride alkoxylates; fatty acid amide alkoxylates; alkylene oxide adducts of alkynediols; sugar derivatives such as amino sugars and amido sugars; polyacrylic and polymethacrylic derivatives; polyamides such as modified gelatins or derivatized polyaspartic acid; surfactant polyvinyl compounds such as modified polyvinylpyrrolidone (PVP); polyol-based alkylene oxide adducts; polyglycerides and derivatives, or combinations thereof.

9. The composition as claimed in claim 8, wherein at least one of the non-ionic surfactants is selected from those that remain liquid at room temperature.

10. The composition as claimed in claim 1, wherein the composition further comprises an organic solvent selected from group comprising of glycols and their derivatives, alcohols, or combinations thereof.

11. The composition as claimed in claim 10, wherein the glycol is selected from the group comprising of propylene glycol, dipropylene glycol, polypropylene glycol, monoethylene glycol, diethylene glycol, polyethlene glycol 300, 1-methoxy-2-propanol, butyl cellosolve or combinations thereof; and the alcohol is selected from the group comprising of methanol, ethanol, propanol, isopropanol, tetrahydrofurfuryl alcohol or combinations thereof.

12. The composition as claimed in claim 1, further comprises additional herbicidally active ingredient selected from the group comprising of organophosphorous herbicides, aliphatic acid herbicides, amide herbicides, aromatic acid herbicides, benzofuran herbicides, benzonitrile herbicides, benzophenone herbicides, benzothiadiazinone herbicides, benzyl ether herbicides, botanical herbicides, carbamate herbicides, cyclohexanedione oxime herbicides, dinitroaniline herbicides, dinitrophenol herbicides, diphenyl ether herbicides, diphenyl heterocycle herbicides, dithiocarbamate herbicides, imidazolinone herbicides, inorganic herbicides, isoxazole herbicides, isoxazolidinone herbicides, isoxazoline herbicides, N-phenyl heterocycle herbicides, N-phenylimide herbicides, N-phenyloxadiazolone herbicides, N-phenyltriazolinone herbicides, organochlorine herbicides, oxirane herbicides, oxyacetamide herbicides, phenol herbicides, phenoxy herbicides, phenylcarboxylic acid herbicides, phenyl ether herbicides, phenylthiourea herbicides, pyridazine herbicides, pyridazinone herbicides, pyridine herbicides, pyrimidinediamine herbicides, pyrimidinyloxybenzylamine herbicides, quaternary ammonium herbicides, quinone herbicides, alpha-thioacetamide herbicides, thiocarbamate herbicides, thiocarbonate herbicides, triazine herbicides, triazinone herbicides, triazole herbicides, triazolone herbicides, triazolopyrimidine herbicides, triketone herbicides, uracil herbicides, urea herbicides or any unclassified herbicides or combinations thereof.

13. The composition as claimed in claim 12, wherein the additional herbicidally active ingredient is imidazolinone herbicides selected from imazamox, imazapic, imazapyr, imazethapyr or salts thereof; organophosphorous herbicides selected from glyphosate, fosamine, amiprophos, amiprofos-methyl, bensulide or salts thereof; or phenoxy herbicides selected from 2,4-D, 3,4-DA, MCPB, clomeprop, dichlorprop, clodinafop, fenoxaprop, metamifop, quizalofop or salts thereof.

14. A liquid composition comprising
a) glufosinate, its isomers or salts thereof;
b) at least one a- olefin sulfonic acid salt;
c) at least one non-ionic surfactant selected from alkyl polyglucoside, alkyl glucamide or alkyl amine oxide; and
d) organic solvent selected from the group comprising of
i) propylene glycol
ii) combination of propylene glycol and diethylene glycol;
iii) combination of propylene glycol and butyl cellosolve;
iv) combination of propylene glycol and polyethylene glycol.
15. A liquid composition comprising
a) 1% w/w to about 70% w/w glufosinate, its isomer or salt thereof;
b) 0.1% w/w to about 30% w/w at least one a- olefin sulfonic acid salt;
c) 0.1% w/w to about 30% w/w at least one non-ionic surfactant; and
d) 1% w/w to about 40% at least one organic solvent.

16. A process for preparation of a liquid composition comprising mixing glufosinate, its isomer or salts thereof; at least one anionic surfactant including olefin sulfonic acid salts; and at least one non-ionic surfactant to obtain said liquid composition.

17. The process as claimed in claim 16, wherein the process comprises a step of adding at least one an organic solvent.

18. The process as claimed in claim 16, wherein the process is carried out at temperature ranging from 15°C to 60°C.

19. A method of controlling weeds/undesired vegetation by applying to the plants or to their locus, an effective amount of a liquid composition comprising
a) glufosinate, its isomer or salts thereof;
b) at least one anionic surfactant including olefin sulfonic acid salts; and
c) at least one non-ionic surfactant.

20. The method as claimed in claim 19, wherein the glufosinate is L-glufosinate ammonium.