DESC:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2016
COMPLETE SPECIFICATION
(See section 10 and rule 13)

TITLE OF THE INVENTION
A SYNERGISTIC HERBICIDE COMPOSITION

APPLICANT
Godrej Agrovet Limited an Indian company, having its address at Godrej One, 3rd Floor, Eastern Express Highway, Vikhroli (East), Mumbai 400079, Maharashtra, India; an Indian Company.

PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed.
FIELD OF THE INVENTION
[001] The invention relates to herbicidal compositions, more particularly to a broad spectrum synergistic herbicidal formulation and a preparation method thereof.

BACKGROUND OF THE INVENTION
[002] Modern science has been a great influence on the various developments in farming that led to the food safety we enjoy now. There are many factors that influence quantity and quality of yield, but ultimately agriculture is an essential practice without which human life is not possible. The types of weeds that infest fields now are a result of historical events since they are connected to the development of crops and farming techniques.
[003] Tillage is one tool for weed management that is particularly effective. However, mechanical weed control is time-consuming, labor-intensive, and uses a lot of energy. Unfortunately, it has also led to significant erosion issues on a global scale. The use of inorganic substances started more than a century ago and at present chemical weed control has evolved into the era of organic herbicides. Herbicide research with a specific purpose has produced a continual supply of profitable goods. Despite major changes in the use of agrochemicals, the most dominant weeds have remained the same for decades. Wheat is one such crop which is widely cultivated but is affected by multiple weeds that compete with wheat for sunlight, water, nutrients, and space. In addition, they harbor insects and pathogens, which attack crops.
[004] To successfully control the growth of multiple weeds at once, the efficacy of herbicides must be increased by extending their spectrum. Rarely formulations with a single active ingredient satisfy such broad-spectrum demands. As a result, two or more active compositions are needed. Moreover, such compositions comprising two or more actives have several additional advantages such as reduction in inventory products; saving in time and money; and a reduction in the number of times the crop is sprayed with the herbicide.
[005] Combinations containing different herbicide compositions have been practiced in the art, but problems with the stability of such combinations have caused issues with respect to the application and efficacy in many cases. There are chemicals that act as non-selective herbicides which can be used to clear waste ground. No single molecule or composition is known to control all the weeds and not harm the agricultural/horticultural crops. In addition, a part of known herbicide has high toxicity, and many plants develop a resistance to the chemicals over time.
[006] Therefore, there exists a need for a novel synergistic herbicide composition controlling a wide spectrum of weeds along with low toxicity and chemical stability.

SUMMARY OF THE INVENTION
[007] In one aspect, the present invention discloses a synergistic herbicidal composition comprising pyrithiobac acid, its salts or combination thereof and a protoporphyrinogen oxidase (PPO) inhibitor.
[008] In another aspect, the present invention relates to a process of preparing the synergistic herbicidal composition of the present invention.
[009] In another aspect, the present invention relates to a method of effective weed control in plants, said method comprising applying to the soil, a plant and/or propagation material thereof, an effective amount of the synergistic herbicidal composition of the present invention.
[010] In yet another aspect, the present invention relates to the use of the synergistic herbicidal composition in weed control in soil, a plant and/or propagation material thereof.

DETAILED DESCRIPTION OF THE INVENTION
[011] Discussed below are some representative embodiments of the present invention. The invention in its broader aspects is not limited to the specific details and representative methods. An illustrative example is described in this section in connection with the embodiments and methods provided.
[012] It is to be noted that, as used in the specification, the singular forms “a”, “an” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to a composition containing “a compound” includes a mixture of two or more compounds. It should also be noted that the term “or” is generally employed in its sense including “and/or” unless the content clearly dictates otherwise.
[013] The expression of various quantities in terms of “%” or “% w/w” means the percentage by weight of the total solution or composition unless otherwise specified.
[014] In one aspect, the present invention discloses a synergistic herbicidal composition comprising at least two herbicides for a broad-spectrum control of weeds and a process of preparation thereof. The composition preferably comprises an effective amount of pyrithiobac acid, its salt or combination thereof, a protoporphyrinogen oxidase (PPO) inhibitor and optionally comprising agrochemically acceptable excipient.
[015] In an embodiment, the herbicidal composition comprises 1 – 99 % w/w of protoporphyrinogen oxidase (PPO) inhibitor based on the total weight of the composition.
[016] In an embodiment, the herbicidal composition comprises 1 – 99 % w/w of pyrithiobac acid and its salts or combination thereof based on the total weight of the composition.
[017] In an embodiment, the herbicidal composition comprises protoporphyrinogen oxidase (PPO) inhibitor compound preferably selected from a N-Phenyl-imide, its derivatives or combination thereof.
[018] The N-Phenyl-imide derivative compound is preferably selected from, but not limited to, Azafenidin, Carfentrazone-ethyl and Sulfentrazone herbicides. These compounds are used as post emergence herbicide known to control weeds such as Ludwigia parviflora, Digera arevensis, Phyllanthus niruri, Spilanthes sp, 5 Eclipta alba, Cyperus sp (More than 11 Weed genera) in various crops (paddy and wheat).
[019] In an embodiment, the herbicidal composition comprises protoporphyrinogen oxidase (PPO) inhibitor compound is preferably selected from Carfentrazone-ethyl.
[020] In an embodiment, the herbicidal composition comprises pyrothiobac acid or its salt or combination thereof. The pyrothiobac acid and its salts are acetolactate synthase inhibitors used as early post emergence herbicide which controls Trianthema Spp, Amaranthus Spp, Chenopodium Spp, Digera Spp, Celosia argentia weeds (more than 5 weed in cotton).
[021] In a preferred embodiment of the present invention, the herbicidal composition comprises synergistically effective amount of pyrithiobac acid and Carfentrazone-ethyl i.e. 1 - 99 % w/w of pyrithiobac acid and 1 – 99 % w/w Carfentrazone-ethyl based on total wight of the composition.
[022] In yet another preferred embodiment, the herbicidal composition comprises 1 – 25 % w/w of pyrithiobac acid, its salt or combination thereof and 1 – 25 % w/w of Carfentrazone-ethyl based on the total weight of composition to achieve the synergistically effective herbicidal composition.
[023] In an embodiment, the composition optionally comprises agrochemically acceptable excipient selected from the group consisting of, but not limited to, emulsifier, adjuvant, co-solvent, surfactant, aromatic hydrocarbon, polymer, dyes, sand, suspension aids, carriers, solvents, stabilizers, anti-foaming agents, anti-freezing agents, wetting agent, preservatives, antioxidants, colorants, thickeners, solid adherents, inert fillers, dispersing agents, diluents, chelating agents, surfactants, and clays and/or mixtures thereof. The agrochemically acceptable excipients in a pre-determined ratio aids to improving the physical stability and prevents the degradation of the composition leading to long term stability and wide spectrum activity. The employment of excipients used in the composition will depend upon the type of formulation and/or the manner in which the formulation is to be applied by the end user.
[024] In an embodiment the agrochemically acceptable excipients are selected from Polymethyl methacrylate-polyethylene glycol graft copolymer, Polyalkylene oxide block copolymer, Butyl based block copolymer, Nonylphenol surfactant and linear calcium sulfonate blend, Linear dodecyl benzene sulfonate in 2-ethyl hexanol, Tristrylphenol 16 mole ethoxylate, Ethoxylated tristyrylphenol phosphate potassium salt, Polyoxyethylene polyoxypropylene condensate, Linear dodecyl benzene sulfonate in 2-ethyl hexanol, Polyalkoxylated butyl ether, Non-ionic emulsifier Castor oil ethoxylate, Mixture of linear dodecylbenzensulphonic acid, calcium salt and isobutyl alcohol; Non-ionic emulsifier Nonylphenol ethoxylate, Xanthan Gum, Polydimethylsiloxane, 1,2-propanediol (Propylene Glycol), 1, 2 - Benzisothiazoline - 3 – one, Solvent C-9, Water or combination/mixture thereof.
[025] In an embodiment of the invention, the agrochemically acceptable excipients include tristyryl phenol ethoxylate at a concentration of at least 1 % w/w to 10 % w/w based on total weight of the composition, preferably 3 % w/w to 7 % w/w based on total weight of the composition.
[026] In an embodiment, the herbicidal composition can be formulated in any form known to a person skilled in the art selected from the group consisting of, but not limited to, a Dry Flowable (DF), Emulsion in water (EW), Emulsifiable Concentrate (EC), Granules (GR), suspension concentrate (SC) formulation, Water Dispersible Granules (WG), Wettable Powder (WP), ZC a 10 mixed formulation of capsule suspension (CS) and suspension concentrate (SC), Suspoemulsion (SE), Oil Dispersion(OD), Flowable suspension (FS), water dispersible powder for slurry treatment (WS) or powder for dry seed treatment (DS).
[027] In a preferred embodiment of the present invention, the herbicidal composition is formulated in the form of a Dry Flowable (DF) or Emulsion in water (EW) formulation. Typically, the herbicidal composition in the form of a ready-to use stable Dry Flowable (DF) or Emulsion in water (EW) formulation demonstrates synergistic effects with good physical and chemical stability.
[028] Another aspect of the present invention provides a process of preparing the herbicidal composition of the present invention. The process comprises the following steps:
a. Preparation of oil phase based on solvent C9, protoporphyrinogen oxidase (PPO) inhibitor compound preferably selected from a N-Phenyl-imide, its derivatives or combination thereof by mixing with surfactants under slow stirring to form the oil phase;
b. Preparation of aqueous phase based on charge water and agrochemically acceptable excipients in a mixing vessel fitted with homogenizer to form the aqueous phase;
c. Emulsification by slowly adding the oil phase into the aqueous phase and form an emulsion using high speed homogenizer;
d. Adding xanthan gum into the emulsion with simple mixing process using a propeller stirrer to obtain herbicidal composition.
[029] In a preferred embodiment of the present invention, preparation of oil phase is done by charging required quantity of solvent C-9 in a vessel with propeller type stirring. Add Carfentrazone ethyl and Pyrithiobac sodium and mix for 15 minutes to form a mixture. Add surfactants polymethyl methacrylate-polyethylene glycol graft copolymer (Atlox 4913) and Polyalkylene oxide block copolymer (Atlas G 5002L) under slow stirring to form the oil phase.
[030] In a preferred embodiment of the present invention, preparation of aqueous phase is done by putting charge water, polydimethylsiloxane, 1,2-propanediol, and 1, 2 - Benzisothiazoline-3-one to the mixing vessel fitted with homogenizer and mix for 30 minutes to form the aqueous phase.
[031] Yet another aspect of the present invention provides a method of effective weed control in plants, said method comprising applying to the soil, a plant and/or propagation material thereof, an effective amount of the synergistic herbicidal composition.
[032] Advantageously, the synergistic herbicidal composition demonstrates broad spectrum control of weed flora in paddy as an early post emergence herbicide to control more than 11 weed genera. Accordingly, the herbicidal composition is used to control weed species such as Ludwigia parviflora, Digera arevensis, Phyllanthus niruri, Spilanthes spp., Eclipta alba, Cyperus spp. (More than 11 Weed genera) in various crops (paddy and wheat) or combination thereof.
EXAMPLES
[033] The following examples are illustrative of the present invention but not limitative of the scope thereof:
[034] Materials and Methods
[035] Materials: Pyrithiobac Sodium, Carfentrazone ethyl, Solvent C-9, Polymethyl methacrylate-polyethylene glycol graft copolymer (Atlox 4913), Polyalkylene oxide block copolymer (Atlas G 5002L), Butyl based block copolymer (Toximul 8320), Nonylphenol surfactant and linear calcium sulfonate blend (Toximul - 3479F), Linear dodecyl benzene sulfonate in 2-ethyl hexanol(Witconate P 1220EH), Tristrylphenol 16 mole ethoxylate (Emulsogen TS 160), Ethoxylated tristyrylphenol phosphate potassium salt (Soprophor FLK), Polyoxyethylene polyoxypropylene condensate (Unitop - 203), Linear dodecyl benzene sulfonate in 2-ethyl hexanol (Witconate P 1460EH), Polyalkoxylated butyl ether (Ethylan NS 500LQ), Non ionic emulsifier Castor oil ethoxylate (Emulsogen EL 360), Mixture of linear dodecylbenzensulphonic acid, calcium salt and isobutyl alcohol (Rhodacal 60/B), Non ionic emulsifier Castor oil ethoxylate (Teric CO 36), Non ionic emulsifier Nonylphenol ethoxylate (Unitop - 101), Xanthan Gum (2%)(Rhodopol 23/W), Polydimethylsiloxane (SAG 1572), 1,2-propanediol (Propylene Glycol), 1, 2 - Benzisothiazoline - 3 – one and Water.
[036] Method: Six herbicidal EW formulations comprising the Pyrithiobac Acid and its salts, Carfentrazone-ethyl and agrochemically acceptable excipients were prepared by the following steps:
a) Preparation of oil phase – charge required quantity of solvent C-9 in a vessel with propeller type stirring. Add Carfentrazone ethyl and Pyrithiobac sodium and mix for 15 minutes to form a mixture. Add surfactants polymethyl methacrylate-polyethylene glycol graft copolymer (Atlox 4913) and Polyalkylene oxide block copolymer (Atlas G 5002L) under slow stirring to form the oil phase;
b) Preparation of aqueous phase – Charge water, polydimethylsiloxane, 1,2-propanediol, and 1, 2 - Benzisothiazoline-3-one to the mixing vessel fitted with homogenizer and mix for 30 minutes to form the aqueous phase;
c) Emulsification – Slowly add the oil phase into the aqueous phase and form an emulsion using high speed homogenizer;
d) Add xanthan gum into the emulsion with simple mixing process using a propeller stirrer to obtain EW formulation.
[037] The composition of herbicidal EW formulation prepared according to the above-described method are provided in Table 1 as follows:

[038] Table 1

S. No. Pyrithiobac Sodium (wt/wt%) Carfentrazone ethyl (wt/wt%) Adjuvants/
Emulsifiers
(wt/wt%)
Dose/Ha
(ml)
Formulation Example-1 9.6 3.2 87.2 625
Formulation Example-2 14.4 4.8 80.8 416.6
Formulation Example-3 19.2 6.4 74.4 312.5
Formulation Example-4 3.2 9.6 87.2 625
Formulation Example-5 4.8 14.4 80.8 416.6
Formulation Example-6 6.4 19.2 74.4 312.5

[039] The amounts of various ingredients used in the herbicidal EW formulations comprising the Pyrithiobac acid and its salts, Carfentrazone-ethyl and agrochemically acceptable excipients is summarized in Table 2-7 below.
[040] Formulation Example-1 (Pyrithiobac Sodium 9.6% + Carfentrazone-ethyl 3.2%)
Table 2
Component Name % w/w
Pyrithiobac Sodium a.i. 9.6
Carfentrazone ethyl a.i. 3.2
Solvent C-9 10
Polymethyl methacrylate-polyethylene glycol graft copolymer (Atlox 4913) 3
Polyalkylene oxide block copolymer (Atlas G 5002L) 2
Xanthan Gum (2%)(Rhodopol 23/W) 10
Polydimethylsiloxane (SAG 1572) 0.25
1,2-propanediol (Propylene Glycol) 5
1, 2 - Benzisothiazoline - 3 – one 0.1
Water q.s. to 100

[041] Formulation Example-2 (Pyrithiobac Sodium 14.4% + Carfentrazone-ethyl 4.8%)

Table 3
Component Name % w/w
Pyrithiobac Sodium a.i. 14.4
Carfentrazone ethyl a.i. 4.8
Solvent C-9 10
Butyl based block copolymer (Toximul 8320) 3
Nonylphenol surfactant and linear calcium sulfonate blend (Toximul - 3479F) 3
Xanthan Gum (2%)(Rhodopol 23/W) 10
Polydimethylsiloxane (SAG 1572) 0.25
1,2-propanediol (Propylene Glycol) 5
1, 2 - Benzisothiazoline - 3 – one 0.1
Water q.s. to 100

[042] Formulation Example-3 (Pyrithiobac Sodium 19.2% + Carfentrazone-ethyl 6.4%)
Table 4
Component Name % w/w
Pyrithiobac Sodium a.i. 19.2
Carfentrazone ethyl a.i. 6.4
Solvent C-9 15
Linear dodecyl benzene sulfonate in 2-ethyl hexanol(Witconate P 1220EH) 2
Tristrylphenol 16 mole ethoxylate (Emulsogen TS 160) 6
Xanthan Gum (2%)(Rhodopol 23/W) 7.5
Polydimethylsiloxane (SAG 1572) 0.25
1,2-propanediol (Propylene Glycol) 5
1, 2 - Benzisothiazoline - 3 – one 0.1
Water q.s. to 100

[043] Formulation Example-4 (Pyrithiobac Sodium 3.2% + Carfentrazone-ethyl 9.6%)
Table 5
Component Name % w/w
Pyrithiobac Sodium a.i. 3.2
Carfentrazone ethyl a.i. 9.6
Solvent C-9 15
Ethoxylated tristyrylphenol phosphate potassium salt (Soprophor FLK) 3
Polyoxyethylene polyoxypropylene condensate (Unitop - 203) 5
Xanthan Gum (2%)(Rhodopol 23/W) 10
Polydimethylsiloxane (SAG 1572) 0.25
1,2-propanediol (Propylene Glycol) 5
1, 2 - Benzisothiazoline - 3 – one 0.1
Water q.s. to 100

[044] Formulation Example-5 (Pyrithiobac Sodium 4.8% + Carfentrazone-ethyl 14.4%)
Table 6
Component Name % w/w
Pyrithiobac Sodium a.i. 4.8
Carfentrazone ethyl a.i. 14.4
Solvent C-9 15
Linear dodecyl benzene sulfonate in 2-ethyl hexanol (Witconate P 1460EH) 3
Polyalkoxylated butyl ether (Ethylan NS 500LQ) 3
Non ionic emulsifier Castor oil ethoxylate (Emulsogen EL 360) 2
Xanthan Gum (2%)(Rhodopol 23/W) 10
Polydimethylsiloxane (SAG 1572) 0.25
1,2-propanediol (Propylene Glycol) 5
1, 2 - Benzisothiazoline - 3 – one 0.1
Water q.s. to 100

[045] Formulation Example -6 (Pyrithiobac Sodium 6.4% + Carfentrazone-ethyl 19.2%)

Table 7

Component Name % w/w
Pyrithiobac Sodium a.i. 6.4
Carfentrazone ethyl a.i. 19.2
Solvent C-9 20
Mixture of linear dodecylbenzensulphonic acid, calcium salt and isobutyl alcohol (Rhodacal 60/B) 3
Non ionic emulsifier Castor oil ethoxylate (Teric CO 36) 3
Non ionic emulsifier Nonylphenol ethoxylate (Unitop - 101) 2
Xanthan Gum (2%)(Rhodopol 23/W) 10
Polydimethylsiloxane (SAG 1572) 0.25
1,2-propanediol (Propylene Glycol) 5
1, 2 - Benzisothiazoline - 3 – one 0.1
Water q.s. to 100
[046] Efficacy Studies
[047] Field trials were performed to evaluate the efficacy of herbicidal EW formulation described above on annual grass control and dicot control in Cotton perennial crops.
[048] Cotton crops were grown on plots under natural outdoor conditions and the weed flora present in the field were, but not limited to, preferably Ludwigia parviflora, Phyllanthus niruri, Spilanthes sp, Eclipta alba, Cyperus sp, Trianthema Spp, Amaranthus Spp, Chenopodium Spp, Digera Spp, Celosia argentia at the 2-4 leaf stage.
[049] Herbicidal formulations of the invention in different doses as mentioned in Tables 2-4 were diluted with water to get desired solution having actives as presented in Table 8 and sprayed on cotton crops with weed flora present in the field. Further, Pyrithiobac Sodium and Carfentrazone-ethyl were individually sprayed on the cotton crops with weed flora present in the field.
[050] The application on the cotton crops with weed flora present in the field was preferably as foliar spray at an application rate of 500 liters water per hectare using knapsack sprayer with flat fan nozzle. The number of individual weeds and total weeds present in the field was recorded at 15, 30 and 60 days after the application of the herbicidal formulations of the invention in comparison with untreated control. The total weed control efficacy at 30 days after treatment is shown in Table 8.
[051] Further, Colby's equation was used to determine the herbicidal effects expected from the mixtures. (See Colby, S. R. Calculation of the synergistic and antagonistic response of herbicide combinations. Weeds 1967, 15, 20 - 22.) The following equation was used to calculate the expected activity of mixtures containing two active ingredients, A and B:
Expected = A + B - (A x B/100)
A = observed efficacy of active component A at the same concentration as used in the mixture; B = observed efficacy of active component B at the same concentration as used in the mixture. The ability of the compositions described herein to afford suitable weed control is illustrated by the efficacy data in Table 8.
[052] Total weed control efficacy influenced by various herbicidal EW formulation at 30 days after application in Cotton perennial crops at the 2-4 leaf stage is represented in Table 8 below.
Table 8

Dose rate: gram a.i./ha Total weed control
efficacy at 30 DAT Colby's Difference (O-E) Synergism/ Antagonism/ Additivity
Observed Efficacy in % (O) Calculated Efficacy in % (E)
Pyrithiobac
Sodium Carfentrazone Ethyl
60 0 84 NA NA NA
62.5 0 89 NA NA NA
75 0 94 NA NA NA
0 15 53 NA NA NA
0 20 63 NA NA NA
60 20 98 94.08 3.92 Synergism
DAT: Days after treatment

[053] Highest weed control efficiency was recorded with the application of herbicidal EW formulations of the invention as compared to individual application of each active ingredient Pyrithiobac Sodium and Carfentrazone-ethyl. Further, the results clearly show that herbicidal composition according to the present invention demonstrated a synergistic increase in the spectrum of weed control in addition to reducing the time and labour in a weed management program.
[054] Further, the synergistic herbicidal composition exhibits extremely useful weed control efficiency and has no phytotoxic impact on paddy, wheat and cotton.
[055] The foregoing description of the invention has been set merely to illustrate the invention and is not intended to be limiting. Since the modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to the person skilled in the art, the invention should be construed to include everything within the scope of the disclosure.
,CLAIMS:We Claim:
1. A synergistic herbicidal composition comprising pyrithiobac acid, its salts or combination thereof and a protoporphyrinogen oxidase (PPO) inhibitor.

2. The herbicidal composition as claimed in claim 1, comprising 1 – 99 % w/w of protoporphyrinogen oxidase (PPO) inhibitor and 1 – 99 % w/w of pyrithiobac acid or its salts or combination thereof based on total weight of the composition.

3. The herbicidal composition as claimed in claim 1or 2, wherein the protoporphyrinogen oxidase (PPO) inhibitor is selected from Carfentrazone-ethyl.

4. The herbicidal composition as claimed in claim 1, further comprising agrochemically acceptable excipients selected from carrier, defoamer, wetting agent, disintegrating agent, anti-caking agent, dispersing agent, anionic emulsifier, colorant, polymeric film forming agent, non-ionic emulsifier sticking agent, anionic surfactant, non-ionic surfactant, polymeric surfactant, oil, stabilizer, preservative, thickener, viscosity modifying agent, rheology modifying agent, anti-freezing agent, and mixtures thereof.

5. The herbicidal composition as claimed in claim 1, wherein said composition is in form of any of Dry Flowable (DF), Emulsion in water (EW), Emulsifiable Concentrate (EC), Granules (GR), suspension concentrate (SC) formulation, Water Dispersible Granules (WG), Wettable Powder (WP), ZC a mixed formulation of capsule suspension (CS) and suspension concentrate (SC), Suspoemulsion (SE), Oil Dispersion(OD), Flowable suspension (FS), water dispersible powder for slurry treatment (WS) or powder for dry seed treatment (DS).

6. The herbicidal composition as claimed in claim 1, wherein said composition is in the form of Dry Flowable (DF) or Emulsion in water (EW) formulation.

7. The herbicidal composition as claimed in claim 1, wherein said composition affords control of weeds selected from a group consisting of Ludwigia parviflora, Digera arevensis, Phyllanthus niruri, Spilanthes spp, Eclipta alba, Cyperus spp (More than 11 Weed genera) in various crops (paddy and wheat) or combination thereof.

8. A method of effective weed control in plants, said method comprising applying to the soil, a plant and/or propagation material thereof, an effective amount of the synergistic herbicidal composition as claimed in claims 1 to 8.

9. A process of preparing herbicidal composition comprising the following steps:
a. Preparation of oil phase comprising solvent C9, protoporphyrinogen oxidase (PPO) inhibitor compound preferably selected from a N-Phenyl-imide, its derivatives or combination thereof by mixing with surfactants under slow stirring to form the oil phase;
b. Preparation of aqueous phase based on charge water and agrochemically acceptable excipients in a mixing vessel fitted with homogenizer to form the aqueous phase;
c. Emulsification by slowly adding the oil phase into the aqueous phase and form an emulsion using high speed homogenizer;
d. Adding xanthan gum into the emulsion with simple mixing process using a propeller stirrer to obtain herbicidal composition.

10. Use of the synergistic herbicidal composition claimed in claims 1 to 8 for weed control in soil, a plant and/or propagation material thereof.

Dated this 7th day of February 2023.
Godrej Agrovet Limited
By their Agent & Attorney

(Nisha Austine)
of Khaitan & Co
Reg. No. IN/PA-1390