FIELD OF INVENTION
The present invention relates to the field of synergistic pesticides.
In particular, the invention relates to a novel, broad-spectrum synergistic
herbicidal composition for the control of sedges, narrow leaved and broad5 leaved weeds on Maize crop.
BACKGROUND OF THE INVENTION
Weeds are a persistent problem faced by farmers. If allowed to grow
unrestricted, they compete with crop plants and cause enormous yield
reductions, increase the irrigation requirement thereby increasing the total cost
10 of agriculture. They further reduce the value of produce and the agricultural land
while also causing health hazards to humans and animals.
Maize (Zea mays L) is one of the most versatile emerging crops having wider
adaptability under varied agro-climatic conditions. In India, maize is the third
most important food crops after rice and wheat and contributes nearly 9 % in the
15 national food basket. It is cultivated throughout the year in all states of the
country for various purposes. In addition to staple food for human being and
quality feed for animals, maize serves as a basic raw material as an ingredient to
thousands of industrial products that includes starch, oil, protein, alcoholic
beverages, food sweeteners, pharmaceutical, cosmetic, film, textile, gum,
20 package and paper industries etc.
Successful cultivation of maize depends largely on the efficacy of weed control.
Weed control during the first six to eight weeks after planting is crucial, because
weeds compete vigorously with the crop for nutrients and water during this
period. Annual yield losses occur as a result of weed infestations in cultivated
25 crops. While a no. of herbicidal compositions have been developed to tackle the
problem, there remains a need for improved herbicidal combinations that can
3
effectively control weeds thereby improving yield and plant health, with reduced
phytotoxicity.
For instance, Chinese application no. CN 109452300 discloses a ternary
herbicidal for control of weeds in corn containing halosulfuron methyl,
5 carfentrazone ethyl and diflufenican in the weight ratio 5:1-10:1-7.
Further, Chinese application no.CN 108174865 discloses a herbicidal composition
comprising glufosinate-ammonium and mesotrione as main active ingredients
with mass ratio of 1:60 to 60:1, wherein said herbicidal composition can be used
for post-emergence weed control in corn fields, and is particularly useful for
10 controlling Gramineae and broad-leaved weeds in corn fields.
There is however a continuing need in the art for combinations that have
advantageous properties such as synergism, resistance management, reduces
dosage thus causing minimal damage to the environment. The present invention
aims at providing such a herbicidal combination.
15 OBJECTS OF THE INVENTION
It is an object of the present invention to provide a herbicidal composition which
is free from the existing drawbacks of the herbicidal compositions.
It is yet another object of the present invention to provide a herbicidal
composition which is highly effective in controlling the target weeds in
20 agricultural crops, particularly maize.
It is yet another object of the present invention to provide a herbicidal
composition which is highly effective in controlling a broad spectrum of weedssedges, narrow leaved and broad leaved weeds in agricultural crops, particularly
Maize.
25 It is yet another object of the present invention to provide a herbicidal
composition which is synergistic and comprises as active ingredients-
4
Halosulfuron methyl, Atrazine and Mesotrione combined in specific weight
percentages along with at least one agriculturally acceptable excipient.
It is yet another object of the present invention to provide a herbicidal
formulation that is environmentally safe and free of occupational hazards.
5 SUMMARY OF THE INVENTION
In an aspect of the present invention, there is provided a synergistic herbicidal
composition comprising: (a) Halosulfuron methyl having weight concentration in
the range of 1-80%w/w; (b) Mesotrione having weight concentration in the
range of 1-40%w/w; and (c) Atrazine having weight concentration in the range of
10 30-70%w/w.
In another aspect of the present invention, there is provided a process for
preparing a synergistic herbicidal composition comprising: (a) Halosulfuron
methyl having weight concentration in the range of 1-80%w/w; (b) Mesotrione
having weight concentration in the range of 1-40%w/w; and (c) Atrazine having
15 weight concentration in the range of 30-70%w/w, said method comprising the
steps: 9a) Mixing one or more agriculturally acceptable excipients along with
Mesotrione technical to obtain a homogenous mixture; (b) Adding Atrazine
technical and Halosulfuron methyl technical to homogenous mixture from step
(i); (c) Blending the mixture of step (ii); (d) Grinding the mixture of step (iii) to
20 obtain a mean particle size of below 10 micron; (e) Blending the mixture of step
(iv) to obtain a homogenous mixture and preparing a dough by dough mixer; (f)
Preparing granules from the dough obtained in step (v) though an extruder; and
(g) Drying the extrudate of step (vi) to obtain the wettable granules.
DETAILED DESCRIPTION OF THE INVENTION
25 Those skilled in the art will be aware that the 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
5
variations and modifications. The invention also includes all such steps, features,
compositions and compounds referred to or indicated in this specification,
individually or collectively, and any and all combinations of any two or more of
said steps or features.
5 Unless otherwise specified, all terms used in disclosing the invention, including
technical and scientific terms, have the meaning as commonly understood by
one of the ordinary skill in the art to which the invention belongs. For further
guidance, term definitions may be included to better appreciate the teaching of
the present invention.
10 As used herein, the term “plant” refers to any plant or part thereof including
serial and subterranean parts of the plant. It is contemplated that the parts of
the plant may be, for example, flowers, fruits or vegetables, shoots, leaves,
needles, stalks, stems, fruiting bodies, seeds, also roots and that parts of the
plants may or may not be attached to the remainder of the plant.
15 As used herein, the term “weed” refers to the unwanted plant which competes
for resources with the crop or plant of interest.
As used herein, the term “herbicide” refers to a substance which adversely
affects the existence and growth of the target weed.
As used herein the term “effective amount” is that quantity of active agent,
20 applied in an amount which will provide the required control of weed on
commercial crops. The particular amount is dependent upon many factors
including, for example, type of formulations, the crop, weed sought to be
controlled and environmental conditions.
As used herein, the term “agrochemical excipient” refers to an ingredient,
25 additive, component or supplement, liquid or solid, suitable for incorporation in
agricultural compositions.
6
As used herein, the terms “comprise” , “ comprises” , “comprising”, “include”,
“includes”, and “including” are meant to be non-limiting ie. other steps and
other ingredients which do not affect the end of result can be added. The above
terms encompass the terms “consisting of” and “consisting essentially of”.
5 The terms “weight percent”, “wt-%” , “percent by weight” “% by weight” and
variations thereof ,as used herein , refer to the concentration of a substance as
the weight of that substance divided by the total weight of the composition and
multiplied by 100. It is understood that, as used here, “percent “ “%” and the like
are intended to be synonymous with “weight percent” , “wt. %” , etc.
10 Halosulfuron methyl is a sulfonylurea post-emergence herbicide used to control
annual broad-leaved weeds and sedges in a range of crops, particularly rice but
also turf, maize, grain sorghum and sugarcane. It acts by inhibiting biosynthesis
of the essential amino acids valine and isoleucine, hence stopping cell division
and plant growth. Selectivity derives from rapid metabolism in the crop. It is a
15 systemic herbicide that is absorbed by the root system and /or leaf surface and
translocated to meristem tissues. It has been commercially manufactured and
supplied by companies like Nissan Chemical Industries Ltd and Syngenta Crop
protection.
Mesotrione was developed by Syngenta AG and first registered in 2001. It has
20 been sold under the brand names Callisto and Tenacity. It is a p-Hydroxyphenyl
pyruvate dioxygenase inhibitor that ultimately affects carotenoid biosynthesis.
Selectivity in crop derives from differential metabolism (to the 4-hydroxy
derivative) and also possibly from slower foliar uptake. Uptake is foliar and via
the roots with both acropetal and basipetal translocation and symptoms are
25 whitening of leaves, followed by necrosis of the meristematic tissue.
Atrazine is a herbicide of the triazine class. It is a selective systemic herbicide
absorbed principally through the roots, but also through the foliage, with
translocation acropetally in the xylem and accumulation in the apical meristems
7
and leaves. It is useful for pre- and post- emergence of annual broad leaved
weeds and annual grasses in maize, sorghum, sugarcane, pineapples, chemical
fallow, grasslands, macadamia nuts, conifers and industrial weed control. Like
other triazine herbicides, atrazine functions as photosynthetic electron transport
5 inhibitor at the photosystem II receptor site, Plant death results from starvation
and oxidative damage caused by breakdown in the electron transport process.
Oxidative damage is accelerated at high light intensity.
The present invention relates to a novel, synergistic broad spectrum herbicidal
composition for control of sedges, narrow leaved weeds and broad leaved weeds
10 in Maize (Zea mays) crop. Specifically it pertains to synergistic herbicidal
composition comprising halosulfuron methyl, Atrazine and Mesotrione in specific
weight percentages along with at least one agriculturally acceptable excipient for
control of sedges, narrow leaved weeds and broad leaved weeds in Maize (Zea
mays) crop. The invention further relates to a process for preparing the
15 composition thereof.
Surprisingly it was observed that the herbicidal composition of the present
invention provides a superior weed control at much lower levels of active
ingredient combination as compared to what is achieved when the active
ingredients are applied alone. Accordingly, in an embodiment the present
20 invention relates to a synergistic herbicidal composition comprising 1)
Halosulfuron methyl in an amount ranging from 1-80% w/w of the herbicidal
composition 2) Mesotrione in an amount ranging from 1-40% w/w of the
herbicidal composition 3) Atrazine in an amount ranging from 30-70% w/w of the
herbicidal composition 4) at least one agriculturally acceptable excipient.
25 In an embodiment, the herbicidal composition further includes at least one
agriculturally acceptable excipient selected from the group comprising a wetting
agent, dispersing agent, a binder, carrier, antifoaming agent, etc.
8
In an embodiment, the herbicidal composition of the present invention may be
formulated in a form selected from the group comprising water-soluble
concentrates (SL), emulsifiable concentrates (EC), emulsions (EW), microemulsions (ME), Suspension concentrates (SC), oil-based suspension
5 concentrates (OD), flowable suspensions (FS), water-dispersible granules (WG),
water-soluble granules (SG), wettable powders (WP), water soluble powders
(SP), granules (GR), encapsulated granules (CG), fine granules (FG),
macrogranules (GG), aqueous Suspo-emulsions (SE), capsule suspensions (CS)
and microgranules (MG). Preferred formulations are suspension concentrates
10 (SC), water-dispersible granules (WG) and wettable powders (WP)
In an embodiment the herbicidal composition of the present invention is
formulated in a form of water dispersible granule. In an embodiment, the water
dispersible granules of the present invention comprise a wetting agent, a
dispersing agent, a defoaming agent, a binder and a suitable carrier.
15 In an embodiment the present composition comprises one or more dispersing
agents, wherein said dispersing agent is selected from the group comprising
sodium lignosulphonates, sodium naphthalene sulphonate- formaldehyde
condensates, aliphatic alcohol ethoxylates, tristyrylphenol ethoxylates and
esters, ethylene oxide/propylene oxide block copolymers. Preferably the
20 dispersing agent is Sodium salt of naphthalene sulfonate condensate.
In an embodiment said dispersing agent may be present in an amount ranging
from 5-12% w/w of the herbicidal composition.
In an embodiment, the present composition comprises one or more wetting
agents, wherein said wetting agent is selected from the group comprising blend
25 of alkyl naphthalene sulfonate, sodium salt, Sodium laurel sulphate. In a
preferred embodiment, the wetting agent is Sodium laurel sulphate.
In an embodiment, the wetting agent may be present in an amount ranging from
2-5% w/w of the herbicidal composition.
9
In an embodiment, the present composition comprises one or more anti foaming
agents, wherein said anti- foaming agent is selected from the group comprising
silicone emulsions, long-chain alcohols, fatty acids, organic fluorine compounds.
In an embodiment, the anti-foaming agent is present in an amount ranging from
5 0.2-08% w/w of the composition.
In an embodiment, the present composition comprises one or more carriers,
wherein said carrier is selected from the group comprising Dextrose, Lactose,
Soluble starch, Galactose, Amylodextrin, Maltose, Mannitol, Sucrose, Sorbitol
and China clay.
10 In an embodiment, the present composition comprises one or more binders,
wherein said binder is selected from the group comprising Starch paste,
Hydroxypropyl methylcellulose (HPMC), Polyvinyl Pyrrolidone (PVP), Lactose
monohydrate. In a preferred embodiment, said binder is lactose monohydrate.
In the most preferred embodiment, the present herbicidal composition
15 comprises 3.7% w/w Halosulfuron technical, 60% w/w Atrazine technical, 7.5%
w/w Mesotrione technical, 7 % w/w sodium salt of naphthalene sulfonate
condensate as dispersing agent, 3% w/w sodium laurel sulphate as wetting
agent, 0.05% w/w of silicone based antifoam agent, 10% w/w Lactose IP as
binder and China clay as carrier.
20 (A) Chemical Composition
Mesotrione technical (Basis of 100%) 7.50%w/w
Atrazine technical (Basis of 100%) 60%w/w
Halosufuron technical (Basis of 100%) 3.7%w/w
Dispersing agent (sodium salt of naphthalene
sulfonate condensate)
7%w/w
10
Wetting agent (sodium laurel sulphate) 3%w/w
Antifoam (silicone based) 0.05%w/w
Lactose IP (binder) 10%w/w
China clay (carrier) QS to make %w/w
Total quantity 100%w/w
EXAMPLES
The examples below are given solely for the purpose of illustration and are not to
be construed as limitations of the present invention, as many variations thereof
5 are possible without departing from the spirit and scope of the invention.
EXAMPLE 1: Preparation of combination of the present invention
The preparation of the present invention was carried out by undertaking
following steps:
STEP 1: The preparation of the present combination was carried out by mixing all
10 the raw material such as wetting agent, dispersing agent, filler and Mesotrione
technical were added and mixed to result in a homogeneous mixture. This was
followed by addition of Atrazine technical and Halosulfuron methyl technical in
desired wt. percentages.
STEP 2: The above mixed mass was blended in a blender. Grinding was carried
15 out until a mean particle size of below 10 micron (5-15 micron) was obtained.
STEP 3: After the grinding the mixture was again blended in blender (Post mixing
blending) to obtain a homogeneity in the mixture.
STEP 4: Then the dough was prepared by dough mixer and granules were
prepared though an extruder
11
STEP 5: The granules obtained in above step were dried in hot air or Oven.
STEP 6: Finally, quality parameters were checked.
Table 1: Tentative chemical combination (in percentage)
5 Table 2: Quality parameter of the formulation
S.No. Quality parameter Desired quality
1 Appearance Material should be free visible extraneous
matter, dry and free flowing granules
2 Persistent of foam Persistence of foam should not be more than 60
ml after 1 min
3 Wettability Wettability should be max 120 sec
4 Acidity as H2SO4 Acidity should by 0.5% max
5 Active ingredient
content
Mesotrione -7.5% w/w
Atrazine -60% w/w
Halosulfuron methyl- 3.7% w/w
EXAMPLE 2: Evaluation of bioefficacy of the present composition
S.No. Chemical constituent % combination (w/w)
1 Mesotrione technical (Basis of 100.0%) 1-40%
2 Atrazine technical (Basis of 100.0%) 30-70%
3 Halosulfuron methyl technical (Basis of
100.0%)
1-80%
4 Dispersing agent (Sodium salt of
naphthalene sulfonate condensate)
05-12%
5 Wetting agent (Sodium laurel sulphate) 02-05%
6 Antifoam 0.02-0.8%
7 Lactose IP (carrier) 10.00%
8 China clay QS to make % w/w
Total quantity 100.00%
12
The presently disclosed herbicidal trimix was tested for its bioefficacy against
sedges, narrow leaved weeds and broad leaved weeds on Maize crop during
Kharif season 2018. The trial was conducted on a local variety at Faizabad, Uttar
Pradesh, India. The plants were aligned in a plot size of 30 sq. m., having a
5 spacing of 30 cm between the individual crop plants and a spacing of 45 cm
between the rows. The experiment was laid out in a random block design
consisting of a total of 7 treatments in three replications. Further, the trial was
conducted at a temperature of 29℃ at a relative humidity of 40% and no winds
and with optimum soil moisture. The application of the herbicidal trimix was
10 carried out at the early post-emergence stage around 20-25 days after sowing of
the plants at 2-3 leaves stage of the weeds.
Measured quantity of the formulation was added to the required volume of
water @ 375 lit./ha for spray application. The spray tank was filled with half the
quantity of clean required volume of water and then the measured chemical
15 (according to the dose) was added followed by the rest half quantity of water.
The solution was stirred well before the application. The knapsack sprayer fitted
with boom along with flood jet nozzle was used to apply the herbicidal
composition.
TREATMENT DETAILS:
20 Table 1 below provides the treatment details of the maize crop under present
experiment. For purposes of data presentation, the present composition has
been coded as CCP-75603 WG
Table 3: Treatment details
Treatment Treatment details Dose a.i.
(gm)/hectare
Dose
(gm)/hectare
T-1 Untreated -
T-2 Mesotrione 50 WG 150 300g
13
Treatment Treatment details Dose a.i.
(gm)/hectare
Dose
(gm)/hectare
T-3 Atrazine 50 WP 1250 2500g
T-4 Halosulfuron methyl 75 WG 67.5 90g
T-5 CCP-75603 WG 112.5+900+55.5 1500g
T-6 CCP-75603 WG 131.25 + 1050 +
64.75
1750g
T-7 CCP-75603 WG 150+ 1200 + 74 2000g
Note: CCP-75603 WG (Mesotrione 7.5% + Atrazine 60% + Halosulfuron methyl 3.7%
WG
In order to establish the improved bioefficacy achieved by the present herbicidal
composition, the present inventors conducted field trials T-1 to T-7 as listed
5 above in Table 3. The inventors have compared the results obtained through the
field application of present herbicidal composition coded as CCP-75603 WG in
three preferred dosages with untreated plot and also with the market standards
(T-2, T3 and T4) available for herbicide treatment in Maize crop. T-2, T3 and T4
thus represent the standard products approved for use and Registered under the
10 Insecticides Act, 1968 by the Central Insecticides Board and Registration
committee, Faridabad, European union and available commercially. A person
skilled in the art would appreciate the fact that present inventors have
conducted parallel trials with market standards to establish the synergy and
enhanced bioefficacy achieved through the presently claimed herbicidal
15 combination.
EVALUATION OF BIO EFFICACY IN MAIZE CROP
Weed count: A quadrate (0.5m × 0.5m) was placed at 3 randomly selected places
in all the plots of the experimental field and the number of weed flora were
counted uniformly at 10, 25 and 50 days after application.
14
Weed control: The weed control was calculated based on the no. of live weed
flora at various days after application.
Percent weed control = WC – WT
…………. × 100
5 WC
Where WC= No. of weed in control plot
WT= No. of weed in treated plot
Table 3 (a): Effect of herbicidal treatment on Percent control of Narrow &
Sedges leaves weeds at 21 days after application
10
Treat Treatment details Dose a.i.
(gm)/hectare
Echinochloa
sp. (NLW)
Cyperus Sp.
(SEDGES)
T-1 Untreated - -
T-2 Mesotrione 50 WG 150 21.20 9.09
T-3 Atrazine 50 WP 1250 65.00 13.64
T-4 Halosulfuron methyl
75 WG
67.5 10.00 84.09
T-5 CCP-75603 WG 112.5+900+55.5 75.00 70.45
T-6 CCP-75603 WG 131.25 + 1050 +
64.75
85.00 88.96
T-7 CCP-75603 WG 150+ 1200 + 74 87.00 89.20
Note: CCP-75603 WG- Mesotrione 7.5% + Atrazine 60% + Halosulfuron methyl 3.7%
NLW- Narrow leaves weeds
Table-3 (b): Effect of herbicidal treatment on Percent control of Broad leaves
15 weeds at 21 days after application
Treat Treatment details Dose a.i.
(gm)/hectare
Trianthema
sp. (BLW)
Chenopodiu
m sp. (BLW)
T-1 Untreated - -
T-2 Mesotrione 50 WG 150 73.33 82.00
T-3 Atrazine 50 WP 1250 66.67 52.00
T-4 Halosulfuron methyl
75 WG
67.5 3.5 9.09
T-5 CCP-75603 WG 112.5+900+55.5 86.67 87.88
T-6 CCP-75603 WG 131.25 + 1050 + 93.33 93.94
15
64.75
T-7 CCP-75603 WG 150+ 1200 + 74 93.33 96.96
Note: CCP-75603 WG- Mesotrione 7.5% + Atrazine 60% + Halosulfuron methyl
3.7%
BLW- Broad leaves weedsEXAMPLE 3: Evaluation of phytotoxicity of the
present composition in Maize crop
5 Visual observations were recorded at 3, 7 and 10 days after application (DAA) of
testing the presently disclosed composition and certain other reference
products. The parameters observed were leaf injury on tip/surface, necrosis, vein
clearing, epinasty, hyponasty and wilting. The score scale (1-10) followed for leaf
injury on tips/surface is depicted in the table below:
10 Table 4: Phytotoxicity symptoms scoring and rating for leaf injury on tip/surface
15
20
The observations were recorded as below:
Table-4(a) Phytotoxic effect of various treatments on Maize crop 3 DAA
Treatments Treatment Dose/hectare 3 DAA
Leaf injury on tips/surface Rating
0-10% 1
11-20% 2
21-30% 3
31-40% 4
41-50% 5
51-60% 6
61-70% 7
71-80% 8
81-90% 9
91-100% 10
16
details L N V E H W
T-1 Untreated - - - - - -
T-2 Mesotrione 50
WG
150 0 0 0 0 0 0
T-3 Atrazine 50 WP 1250 0 0 0 0 0 0
T-4 Halosulfuron
methyl 75 WG
67.5 0 0 0 0 0 0
T-5 CCP-75603 WG 112.5+900+55.5 0 0 0 0 0 0
T-6 CCP-75603 WG 131.25 + 1050 +
64.75
0 0 0 0 0 0
T-7 CCP-75603 WG 150+ 1200 + 74 0 0 0 0 0 0
DAA – Days after application,
L- Leaf injury on tips/surface, N-Necrosis, V- Vein clearing, E- Epinasty, H- Hyponasty, Wwilting
Table-4(b) Phytotoxic effect of various treatments on Maize crop after 7 DAA
Treatments Treatment
details
Dose/hectare 7 DAA
L N V E H W
T-1 Untreated - - - - - -
T-2 Mesotrione 50
WG
150 0 0 0 0 0 0
T-3 Atrazine 50 WP 1250 0 0 0 0 0 0
T-4 Halosulfuron
methyl 75 WG
67.5 0 0 0 0 0 0
T-5 CCP-75603 WG 112.5+900+55.5 0 0 0 0 0 0
T-6 CCP-75603 WG 131.25 + 1050 +
64.75
0 0 0 0 0 0
T-7 CCP-75603 WG 150+ 1200 + 74 0 0 0 0 0 0
5 DAA – Days after application,
L- Leaf injury on tips/surface, N-Necrosis, V- Vein clearing, E- Epinasty, H- Hyponasty, Wwilting
Table-4(c) Phytotoxic effect of various treatments on Maize crop after 10 DAA
Treatments Treatment
details
Dose/hectare 10 DAA
L N V E H W
T-1 Untreated - - - - - -
17
Treatments Treatment
details
Dose/hectare 10 DAA
L N V E H W
T-2 Mesotrione 50
WG
150 0 0 0 0 0 0
T-3 Atrazine 50 WP 1250 0 0 0 0 0 0
T-4 Halosulfuron
methyl 75 WG
67.5 0 0 0 0 0 0
T-5 CCP-75603 WG 112.5+900+55.5 0 0 0 0 0 0
T-6 CCP-75603 WG 131.25 + 1050 +
64.75
0 0 0 0 0 0
T-7 CCP-75603 WG 150+ 1200 + 74 0 0 0 0 0 0
DAA – Days after application,
L- Leaf injury on tips/surface, N-Necrosis, V- Vein clearing, E- Epinasty, HHyponasty, W-wilting
Result and observations
5 The prominent grassy weed species in the weedy plot at the time of application
were Echinocloa sp. (Narrow leaves weeds) and Cyperus sp. (Sedges), while
among the broad leaves weed the major weed flora included Trianthema sp. and
Chenopodium sp.
It was clearly observed that the application of the present novel herbicide trimix
10 coded as CCP-75603 WG (Mesotrione 7.5% + Atrazine 60% + Halosulfuron methyl
3.7% at a dosage of 131.25 + 1050 + 64.75 gm a.i. (active ingredient) per hectare
provided effective control of both the narrow leaved weeds including Echinocloa
sp., Sedges including Cyperus sp. and Broad leaves weeds including Trianthema
sp. and Chenopodium sp. at 2-4 leaved stage of weeds without showing any
15 phytotoxicity related symptoms on Maize crop.
18
It should be noted that the above disclosure is non- limiting and modifications
and variations are possible without departing from the spirit and scope of the
invention.

I/We Claim:
1. A synergistic herbicidal composition comprising:
a. Halosulfuron methyl having weight concentration in the range of
1-80%w/w;
5 b. Mesotrione having weight concentration in the range of 1-
40%w/w; and
c. Atrazine having weight concentration in the range of 30-70%w/w.
2. The herbicidal composition as claimed in claim 1, further comprising at least
one agriculturally acceptable excipient.
10 3. The herbicidal composition as claimed in claim 1, wherein the weight
concentration of Halosulfuron methyl is 3.7% w/w; weight concentration of
Mesotrione is 7.5% w/w; and weight concentration of Atrazine is 60%w/w.
4. The herbicidal composition as claimed in claims 1-3, wherein said herbicidal
composition is formulated in a form selected from the group consisting of
15 water-soluble concentrates (SL), emulsifiable concentrates (EC), emulsions
(EW), micro-emulsions (ME), Suspension concentrates (SC), oil-based
suspension concentrates (OD), flowable suspensions (FS), water-dispersible
granules (WG), water-soluble granules (SG), wettable powders (WP), water
soluble powders (SP), granules (GR), encapsulated granules (CG), fine
20 granules (FG), macrogranules (GG), aqueous Suspo-emulsions (SE), capsule
suspensions (CS), and microgranules (MG).
5. The herbicidal composition as claimed in claim 4, wherein said herbicidal
composition is formulated in a form selected from the group consisting of
water-dispersible granules (WG) and wettable powders (WP).
25 6. The herbicidal composition as claimed in claim 2, wherein said at least one
agriculturally acceptable excipient is selected from the group consisting of at
least a dispersing agent, at least a wetting agent, at least a binder, at least a
carrier, at least an antifoaming agent and combinations thereof.
20
7. The herbicidal composition as claimed in claim 6, wherein said at least a
dispersing agent weight concentration is in the range of 5-12% w/w, at least
a wetting agent weight concentration is in the range of 2-5% w/w, at least an
anti-foaming agent weight concentration is in the range of 0.2-08% w/w of
5 the herbicidal composition.
8. A process for preparing the herbicidal composition as claimed in preceding
claims, wherein said process comprises following steps:
a. Mixing one or more agriculturally acceptable excipients along with
Mesotrione technical to obtain a homogenous mixture;
10 b. Adding Atrazine technical and Halosulfuron methyl technical to
homogenous mixture from step (i);
c. Blending the mixture of step (ii);
d. Grinding the mixture of step (iii) to obtain a mean particle size in
the range of 5-15 micron;
15 e. Blending the mixture of step (iv) to obtain a homogenous mixture
and preparing a dough by dough mixer;
f. Preparing granules from the dough obtained in step (v) though an
extruder; and
g. Drying the extrudate of step (vi) to obtain the wettable granules.