Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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AQUEOUS HERBICIDAL INTERMIXTURES
TECHNICAL FIELD OF THE INVENTION
The invention relates to herbicidal intermixtures. More particularly, the
invention
relates to essentially aqueous homogeneous herbicide compositions comprising
electrolytic herbicides and a multipart amine component.
BACKGROUND OF THE INVENTION
Controlling unwanted plants is of high importance in agriculture. Over the
years,
various strategies have been developed for effective control of these unwanted
plants. Depending upon the region it is necessary to find or develop
appropriate
techniques for desired weed control. A large part of the surface of the world
is arid,
characterized as too dry for conventional rain fed agriculture and hence it
demands
for precise or specific weed control techniques.
"Arid" implies prolonged dryness, and is used with respect to the climate and
the
land below it. In such regions the ability to produce agricultural crops is
restricted.
Usually on arid lands the potential evaporation of water from the land exceeds
the
rainfall. The land may be characterized according to the degree of aridity as
dry
forest, chaparral or brushland, grassland or savannah, or desert. "Arid" does
not
adequately characterize the soils, however, for they may vary in many ways.
Often
they are alkaline or saline.
An arid ecosystem differs in many respects from one of tropical or temperate
zones. Unlike temperate zones, an arid zone is characterized as an area of low
precipitation, high temperature, and high rate of evaporation. Frequency of
rainfall
does not describe accurately the type of the arid zone nor does the amount of
precipitation govern the type of vegetation.
Among the various agronomic practices that could bring about immediate
positive
results in dryland and arid areas, optimum and effective weed control is the
first
and foremost management practice. However many weeds growing naturally in the
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arid region have evolved a more complicate overall drought adaptation strategy
which usually involves several mechanisms of drought escape, tolerance and
avoidance. The leaf shedding option, the tight stomatal control and the
development of a prolific root system are all specific characteristics
developed by
the vegetation destined to grow in arid regions. The plants adopt to
osmoregulation
and increase in elasticity of the cell and a decrease in cell size. Due to
such natural
adaption of the plants/weeds to the specific conditions, they are tougher than
those
growing under normal conditions and is difficult to control. Further such
weeds
have thick and waxy cuticle layers defending them from the penetration of any
use
of foliar herbicides. It has been observed that the commonly used non-
selective
herbicide such as glufosinate based formulations were not providing an
effective
weed control in arid regions.
Glufosinate is a non-selective foliage application type herbicide which kills
or
controls many species of weeds. In the Pesticide Manual 15th Edition,
glufosinate
has been described as being widely used in burn-down segments, and for control
of a wide range of broad-leaved weeds and grasses and sedges in cereals,
cotton,
corn and soy, fruit orchards, vineyards, rubber and oil palm plantations,
ornamental
trees and bushes, non-crop land, and pre-emergence in vegetables.
Glufosinate being a contact herbicide is known to be used with various
adjuvants
to improve the efficacy or to induce certain specific properties as required.
US6642177 discloses that to be effective, glufosinate must be formulated with
a
high concentration of surfactants to get the required bio efficacy.
DE 3931051 discloses salts of herbicidal acids with long-chain nitrogen bases
such
as fatty amines.
It has been observed by the inventors of the present invention that existing
formulations of non-selective herbicide such as glufosinate is not effective
as
desired particularly in arid environments. In view of such observation, there
is a
necessity for developing more effective formulations which are physically
stable as
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well as bio-efficaceous irrespective of the environment such as arid, or non-
arid
regions.
With the forgoing in consideration, the primary object of the present
invention is the
designing and preparation of a novel composition of glufosinate which is
highly
efficacious particularly in arid region where the weeds are having thick and
waxy
leaves and is difficult to penetrate with usual foliar herbicidal
formulations.
OBJECTS OF THE INVENTION
It is an object of the present invention to provide an aqueous herbicidal
formulation
comprising glufosinate and a multi-part amine component.
It is another object of the present invention to provide an aqueous herbicidal
formulation comprising glufosinate and a multi-part amine component for
effective
weed control in arid regions.
It is another object of the present invention to provide a process or
preparing an
aqueous herbicidal formulation comprising glufosinate and a multi-part amine
component.
Yet another object of the present invention is to provide a method for
controlling
unwanted plants in arid regions.
SUMMARY OF THE INVENTION
The present invention provides an herbicidal intermixture comprising:
a) An electrolytic herbicide; and
b) a multipart amine component.
The present invention provides an herbicidal intermixture comprising:
a) An electrolytic herbicide;
b) a multipart amine component; and
c) water.
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The present invention further provides an herbicidal intermixture comprising:
a) a phosphinic acid herbicide, its salts, its isomers, mixture of isomers,
derivatives, or lower alkyl esters thereof;
b) a multipart amine component;
c) optionally other agrochemical excipients; and
d) water.
In another aspect the present invention provides an aqueous herbicidal
composition comprising:
(a) a phosphinic acid herbicide, its salts, its isomers, mixture of isomers,
derivatives, or lower alkyl esters thereof;
(b) a multipart amine component;
(c) one or more organic solvents;
(d) optionally one or more adjuvants; and
(e) water,
wherein said multipart amine component comprises at least one tertiary amine
having an alkyl group of at least 8 carbon atoms.
In another aspect of the present invention, there is provided a process for
preparing
herbicidal intermixture according to the present invention.
Another aspect of the present invention is to provide a method controlling
unwanted plants in crop and non-crop areas, said method comprising applying to
the plants, unwanted plants or to their locus, a herbicidally effective amount
of
herbicidal intermixtures according to the present invention.
The present invention further provides a method of controlling unwanted plants
in
crop and non-crop areas in arid region, said method comprising applying to the
plants, unwanted plants or to their locus in arid region, an herbicidally
effective
amount of herbicidal intermixtures according to the present invention.
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DETAILED DESCRIPTION
It has been found out that highly efficacious herbicidal compositions
comprising
glufosinate can be developed by intermixing glufosinate with multipart amine
components. In order to overcome the inefficiencies of the existing
formulations
5 particularly in arid regions, inventors of the present invention
surprisingly found out
that herbicidal intermixture of glufosinate with multipart amine components
can be
effectively used.
Thus according to an aspect of the present invention, there is provided an
herbicidal intermixture comprising:
a) An electrolytic herbicide; and
b) a multipart amine component.
In an embodiment, the intermixture comprises water.
The present invention thus provides an herbicidal intermixture comprising:
a) An electrolytic herbicide;
b) a multipart amine component; and
c) water.
In another embodiment, the intermixture of the present invention possesses
superior herbicidal activity.
In an embodiment, the term intermixture includes an admixture.
In certain embodiments, the term intermixture includes the mixtures resulting
from
any one of the processes selected from reaction, solubilisation,
neutralization or
partial neutralization occurring between the components of the intermixture.
In certain other embodiments, the term intermixture includes a composition or
formulation according to the present invention.
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Accordingly, in certain other embodiments, there is provided an herbicidal
mixture
comprising:
a) An electrolytic herbicide; and
b) a multipart amine component.
In an embodiment, the herbicidal mixture comprises water.
Accordingly, in certain other embodiments, there is provided an herbicidal
mixture
comprising:
a) An electrolytic herbicide;
b) a multipart amine component; and
c) water.
In another embodiment, the herbicidal mixture of the present invention
possesses
superior herbicidal activity.
In an embodiment of the present invention, the electrolytic herbicide is
selected
from phospinic acid herbicides.
In some embodiments the phosphinic acid herbicide is selected from the group
comprising glufosinate and glyphosate.
In certain embodiments glufosinate refers to its derivatives selected from
lower
alkyl esters thereof or salts thereof with acids or bases such as its
hydrochloride,
monosodium salt, disodium salt, monopotassium salt, dipotassium salt,
monocalcium salt, ammonium salt, -NH3(CH3)+ salt, -NH2(CH3)2+ salt, -
NH(CH3)3+ salt, -NH(CH3)2(C2H4OH)+, -NH2(CH3)(C2H4OH)+, or its methyl
ester, ethyl ester, propyl ester or butyl ester.
In certain other embodiments, glufosinate refers to isomers or mixture of
isomers.
In a preferred embodiment, the isomer is glufosinate-P.
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In some embodiments, glyphosate refers to glyphosate-mono ammonium,
glyphosate diammonium, glyphosate-isopropylammonium, glyphosate-potassium
or glyphosate isopropyl amine salt.
Thus according to another aspect of the present invention, there is provided
an
herbicidal intermixture comprising:
a) a phosphinic acid herbicide, its salts, its isomers, mixture of isomers,
derivatives, or their lower alkyl esters thereof;
b) a multipart amine component;
c) optionally other agrochemical excipients; and
d) water.
In an embodiment, the intermixture of the invention possesses superior
herbicidal
activity.
In an embodiment the multipart amine component comprises one or more tertiary
amines having alkyl groups of 8 to 20 carbon atoms.
In another embodiment the multipart amine component comprises one or more
tertiary dimethyl alkylamines wherein the alkyl groups have 8 to 20 carbon
atoms.
In some embodiments, the multipart amine component comprises one or more
tertiary dimethyl alkylamines wherein the alkyl groups have 10 to 20 carbon
atoms.
In an embodiment, the multipart amine component according to the present
invention comprises at least two tertiary amines having alkyl groups of 8 to
20
carbon atoms.
In another embodiment, the multipart amine component according to the present
invention comprises at least three tertiary amines having alkyl groups of 8 to
20
carbon atoms.
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In an embodiment, the multipart amine component according to the present
invention comprises at least four tertiary amines having alkyl groups of 8 to
20
carbon atoms.
In an embodiment, the multipart amine component according to the present
invention comprises at least two tertiary dimethyl alkylamines having alkyl
groups
of 8 to 20 carbon atoms.
In another embodiment, the multipart amine component according to the present
invention comprises at least three tertiary dimethyl alkylamines having alkyl
groups
of 8 to 20 carbon atoms.
In another embodiment, the multipart amine component according to the present
invention comprises at least four tertiary dimethyl alkylamines having alkyl
groups
of 8 to 20 carbon atoms.
In another embodiment, the multipart amine component according to the present
invention comprises at least one tertiary dimethyl alkylamine having alkyl
groups
of 10 to 18 carbon atoms.
In an embodiment, the multipart amine component according to the present
invention comprises at least two tertiary dimethyl alkylamines having alkyl
groups
of 8 to 20 carbon atoms wherein said tertiary dimethyl alkylamines are present
in
a ratio of 1:99 to 99:1.
In another embodiment, the multipart amine component according to the present
invention comprises at least two tertiary dimethyl alkylamines having alkyl
groups
of 8 to 20 carbon atoms wherein at least one dimethyl alkylamine is present at
least
in an amount about 50% by weight of the multipart amine component.
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In an embodiment, the term intermixture or admixture according to the present
invention includes a composition or a formulation.
In an embodiment of the present invention, the composition comprises from
about
0.1% to about 60% by weight of phosphinic acid herbicide.
In a preferred embodiment the composition comprises from about 1% to about 50%
by weight of phosphinic acid herbicide.
In an embodiment the composition comprises from about 0.1% to about 60% by
weight of multipart amine component.
In a preferred embodiment the composition comprises from about 1% to about 50%
by weight of multipart amine component.
In an embodiment the composition comprises phosphinic acid herbicide and
multipart amine component in a molar ratio of from about 1: 1.5 to about
1.5:1.
In a preferred embodiment the composition comprises phosphinic acid herbicide
and multipart amine component in a molar ratio of about 1: 1.5
In another preferred embodiment the composition comprises phosphinic acid
herbicide and multipart amine component in an equimolar ratio.
In another embodiment, the compositions according to the present invention
further
comprises organic solvents.
Thus accordingly, the present invention provides an aqueous herbicidal
composition comprising:
a) a phosphinic acid herbicide, its salts, its isomers, mixture of isomers,
derivatives, or their lower alkyl esters thereof;
b) a multipart amine component;
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C) one or more organic solvents;
d) optionally one or agrochemical excipients; and
e) water;
wherein said multipart amine component comprises at least one tertiary amine
5 having an alkyl group of at least 8 carbon atoms.
In an embodiment, the solvents may be selected from but are not limited to:
a water miscible polar/non-polar or a water immiscible polar/non-polar
solvent, for
10 example, alkyl esters of pthalic acid and trimellitic acid; aromatic
hydrocarbons
such as xylene, solvesso-100, solvesso-150, solvesso-200, alkyl benzenes;
methylnaphthalene; mixtures of aromatics aliphatic or cycloaliphatic
hydrocarbon
such as hexane and heptanes; phthalates; ketones such as cyclohexanone, 2-
octanone or acetophenone, methyl isobutyl ketone - saturated or unsaturated
.. cyclic ketones such as isophorone, chlorinated hydrocarbons; vegetable oils
and
modified vegetable oils; glycols and their derivatives, polyglycols; aliphatic
alcohols, alkoxy aliphatic alcohols or mixtures of such two or more solvents.
Other
solvents can be alkylene carbonates (like propylene carbonate), alkyl amides,
and
esters such as alkyl esters of monocarboxylic acids and dicarboxylic acid,
ester-
amides, cyclic ethers such furan and its derivatives or mixtures thereof.
In certain embodiments of the present invention, the herbicidal intermixtures
further
comprises other agrochemical excipients.
In some embodiments, other agronomically suitable excipients are selected from
but are not limited to surfactants, solvent, fertilizer, pH modifiers,
crystallization
inhibitors, viscosity modifiers, suspending agents, spray droplet modifiers,
pigments, antioxidants, foaming agents, light-blocking agents, compatibilizing
agents, antifoam agents, sequestering agents, neutralizing agents, corrosion
inhibitors, dyes, odorants, spreading agents, penetration aids,
micronutrients,
emollients, lubricants, sticking agents, dispersing agents, thickening agents,
freezing point depressants, antimicrobial agents, and the like.
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In an embodiment, the herbicidal intermixture of the present invention may be
combined with at least another active ingredient selected from the group
comprising herbicides, insecticides, fungicides, biological agents, plant
growth
activators, fertilizers or combinations thereof.
Thus, in an embodiment, the herbicidal intermixture according to the present
invention may be combined with an herbicide. Exemplary herbicides that may be
combined with the herbicidal intermixture of the present invention may
include, but
are not limited to, herbicides selected from classes such as ACCase
inhibitors, ALS
inhibitors, EPSP synthase inhibitors, synthetic auxins, auxin transport
inhibitors,
HPPD inhibitors, lipid synthesis inhibitors, long chain fatty acid inhibitors,
as well
as herbicides with unknown modes of action.
According to another aspect, the present invention further provides a process
for
preparing herbicidal intermixtures according to the invention.
In an embodiment, the present invention provides a process for preparing
herbicidal intermixture according to the invention, said process comprising
the
steps:
a) mixing a multipart amine component with water;
b) adding an electrolytic herbicide to prepare a clear solution.
Thus in an embodiment, there is provided a process for preparing an herbicidal
intermixture comprising:
a) An electrolytic herbicide; and
b) multipart amine component said process comprising the steps:
i. mixing said multipart amine component with water; and
ii. adding said electrolytic herbicide to prepare a clear solution.
In some embodiments, the present invention provides a process for preparing
herbicidal compositions according to the invention, said process comprising:
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a) mixing a multipart amine component with water;
b) adding one or more organic solvents;
c) optionally adding other agrochemical excipients; and
d) intermixing an electrolytic herbicide with the mixture obtained in step c)
until
a clear solution is obtained.
In certain embodiments, the present invention provides a process for preparing
herbicidal compositions according to the invention, said process comprising
the
steps:
a) mixing a multipart amine component with water;
b) adding one or more organic solvents;
c) optionally adding other agrochemical excipients; and
d) intermixing a phosphinic acid herbicide, its salts, its isomers, mixture of
isomers, derivatives, or their lower alkyl esters thereof with the mixture
obtained in step c) until a clear solution is obtained.
In certain embodiments, the phosphinic acid herbicide is selected from
glufosinate,
its salts, its isomers, mixture of isomers, derivatives, or their lower alkyl
esters
thereof.
Thus in certain embodiments, the present invention provides a process for
preparing herbicidal compositions according to the invention, said process
comprising the steps:
a) mixing a multipart amine component with water;
b) adding one or more organic solvents;
c) optionally adding other agrochemical excipients; and
d) intermixing glufosinate, its salts, its isomers, mixture of isomers,
derivatives,
or their lower alkyl esters thereof with the mixture obtained in step c) until
a
clear solution is obtained.
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In certain other embodiments, the present invention provides a process for
preparing herbicidal compositions according to the invention, said process
comprising the steps:
a) mixing a multipart amine component with water;
b) adding one or more organic solvents;
c) adding other agrochemical excipients selected from the group comprising
nonionic surfactants, anionic surfactants, wetting agents and dispersing
agents; and
d) intermixing glufosinate, its salts, its isomers, mixture of isomers,
derivatives,
or their lower alkyl esters thereof with the mixture obtained in step c) until
a
clear solution is obtained.
In certain embodiments the multipart amine component comprises one or more
tertiary amines having alkyl groups of 8 to 20 carbon atoms.
In certain other embodiments the multipart amine component comprises one or
more tertiary dimethyl alkylamines wherein the alkyl groups have 8 to 20
carbon
atoms.
In some embodiments, the multipart amine component comprises one or more
tertiary dimethyl alkylamines wherein the alkyl groups have 10 to 18 carbon
atoms.
The present invention further provides a method of controlling unwanted plants
in
crop and non-crop areas, said method comprising applying to the plants,
unwanted
plants or to their locus a herbicidally effective amount of compositions
according to
the present invention.
Accordingly, the present invention provides a method of controlling unwanted
plants in arid regions said method comprising applying to the to the plants,
unwanted plants or to their locus a herbicidally effective amount of
compositions
according to the present invention.
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In an embodiment, the present invention provides a method of controlling
unwanted plants in both crop and non-crop areas in arid region said method
comprising applying to the unwanted plants or to their locus a herbicidally
effective
amount of compositions according to the present invention.
Thus in an embodiment there is provided a weed control method in arid region,
said method comprising applying to the weeds or to their locus a herbicidally
effective amount of herbicidal intermixture comprising:
a) An electrolytic herbicide;
b) a multipart amine component; and
c) water.
In another embodiment, there is provided a weed control method in arid region,
said method comprising applying to the weeds or to their locus a herbicidally
effective amount of herbicidal intermixture comprising:
a) a phosphinic acid herbicide, its salts, its isomers, mixture of isomers,
derivatives, or their lower alkyl esters thereof;
b) a multipart amine component;
c) optionally other agrochemical excipients; and
d) water.
Examples:
Example 1: A herbicidal intermixture according to the present invention
comprising
glufosinate ammonium is prepared as follows:
Ingredient Quantity(% w/w)
glufosinate ammonium 25.2
multipart amine (012-014) 20.0
wetting agent 15.0
organic solvent 10.0
ammonium sulfate 5.0
water q.s.
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The composition is prepared by a process as follows:
Required quantity of multipart amine component, wetting agent, organic
solvent,
ammonium sulfate and water were combined and mixed until a homogeneous
5 mixture is obtained. Required quantity of glufosinate ammonium was added
in
portions and mixed vigorously until a clear solution is obtained.
Example 2: A herbicidal intermixture according to the present invention
comprising
glufosinate acid is prepared as follows:
Ingredient Quantity(% w/w)
glufosinate acid 17.0
multipart amine (010-014) 20.0
wetting agent 15.0
organic solvent 10.0
ammonium sulfate 5.0
water q.s.
The composition was prepared by following process given for example 1.
Example 3: A herbicidal intermixture according to the present invention
comprising
glufosinate dipotassium salt is prepared as follows:
Ingredient Quantity (% w/w)
glufosinate dipotassium salt 30.0
multipart amine (010-018) 20.0
wetting agent 15.0
organic solvent 10.0
ammonium sulfate 5.0
water q.s.
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Example 4: A herbicidal intermixture according to the present invention
comprising
glufosinate acid is prepared as follows:
Ingredient Quantity (% w/w)
glufosinate acid 17.0
multipart amine(C10-018) 20.0
Wetting agent 25.0
organic solvent 10.0
ammonium sulfate 5.0
water q.s.
Example 5: A herbicidal intermixture according to the present invention
comprising
glufosinate ammonium is prepared as follows
Ingredient Quantity (% w/w)
glufosinate ammonium 15.0
multipart amine(012-016) 20.0
Wetting agent 17.0
Alkyl polyglycoside 10.0
organic solvent 10.0
ammonium sulfate 5.0
water q.s.
Example 6: A herbicidal intermixture according to the present invention
comprising
glufosinate acid is prepared as follows:
Ingredient Quantity (% w/w)
glufosinate acid 17.0
multipart amine(012-016) 20.0
Sodium lauryl ether sulfate 16.5
Wetting agent 8.5
organic solvent 10.0
ammonium sulfate 5.0
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water q.s.
Example 7: A herbicidal intermixture according to the present invention
comprising
glufosinate ammonium and glyphosate isopropyl amine is prepared as follows:
Ingredient Quantity (% w/w)
glufosinate ammonium 15.00
glyphosate IPA 30.00
multipart amine(012-014) 18.0
wetting agent 15.0
organic solvent 10.0
ammonium sulfate 5.0
water q.s.
Example 8: A herbicidal intermixture according to the present invention
comprising
glufosinate acid and glyphosate isopropyl amine is prepared as follows:
Ingredient Quantity (% w/w)
glufosinate acid 15.4
glyphosate IPA 29.0
multipart amine(012-014) 20.0
wetting agent 15.0
organic solvent 10.0
ammonium sulfate 5.0
water q.s.
Example 9: A herbicidal intermixture according to the present invention
comprising
glufosinate acid and glyphosate isopropyl amine is prepared as follows:
Ingredient Quantity (% w/w)
glufosinate acid 15.4
glyphosate IPA 18.5
multipart amine(C10-018) 20.0
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wetting agent 15.0
organic solvent 10.0
ammonium sulfate 5.0
water q.s.
Example 10: A herbicidal intermixture according to the present invention
comprising glufosinate acid and glyphosate isopropyl amine is prepared as
follows
Ingredient Quantity (% w/w)
glufosinate acid 15.4
glyphosate IPA 29.0
multipart amine(C10-018) 20.0
wetting agent 15.0
organic solvent 10.0
ammonium sulfate 5.0
water q.s.
Example 11: A herbicidal intermixture according to the present invention
comprising glufosinate acid and glyphosate acid is prepared as follows
Ingredient Quantity (% w/w)
glufosinate acid 15.4
glyphosate acid 15.0
multipart amine(08-C20) 20.0
wetting agent 15.0
organic solvent 10.0
ammonium sulfate 5.0
water q.s.
Example 12: A herbicidal intermixture according to the present invention
comprising glufosinate acid and glyphosate acid is prepared as follows:
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Ingredient Quantity (% w/w)
glufosinate acid 15.4
glyphosate acid 15.0
multipart amine (010-020) 20.0
wetting agent 15.0
organic solvent 10.0
ammonium sulfate 5.0
water q.s.
Example 13: A herbicidal intermixture according to the present invention
comprising glufosinate acid and glyphosate acid is prepared as follows:
Ingredient Quantity (% w/w)
glufosinate acid 15.4
glyphosate acid 15.0
multipart amine (Cio-C18) 20.0
wetting agent 15.0
organic solvent 10.0
ammonium sulfate 5.0
water q.s.
Field Trial:
Field trials were carried out in arid regions using the herbicidal
intermixtures
comprising glufosinate prepared according to the present invention as the
broad-
spectrum herbicide in arid regions. Two comparative compositions were prepared
(in the absence of multipart amine component) and tested along with the
inventive
compositions to find out the bio-efficacy. The details of the compositions are
as
given below:
Example 14: A herbicidal intermixture according to the present invention
comprising glufosinate acid is prepared as follows:
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Ingredient Quantity (% w/w)
Glufosinate acid 17.0
multipart amine (010-014) 20.0
Syngergen GA 12.0
Synergen PFA 6.0
1-methoxy-2-propanol 6.0
propylene glycol 8.0
ammonium sulfate 5.0
water QS
Comparative example (Example 15):
A composition of glufosinate acid (in the absence of multipart amine
component)
was prepared as follows:
Ingredient Quantity (% w/w)
Glufosinate acid 17.0
Syngergen GA 17.0
Synergen PFA 10.0
1-methoxy-2-propanol 10.0
ammonium sulfate 5.0
Propylene glycol 14.0
water QS
5
Comparative example (Example 16):
A composition of glufosinate salt (in the absence of multipart amine
component)
was prepared as follows:
Ingredient Quantity (% w/w)
Glufosinate ammonium 25.2
Synergen GA 17.0
Synergen PFA 10.0
1-methoxy-2-propanol 10.0
ammonium sulfate 5.0
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Propylene glycol 14
water QS
The compositions were diluted with water and applied to broad leave weeds,
grasses and sedges in the arid region.
After treatment using composition (Example 14) prepared according to the
present
invention, chlorosis followed by necrosis of the weeds were observed
demonstrating the bio-efficacy of the new compositions. Comparative
compositions (Example 15 and Example 16) and market sample of glufosinate
ammonium (Liberty 280 SL Glufosinate ammonium) were also tested to compare
the results. The observations at 7 days, 14 days and 21 days after application
were
summarized in below table (table 1).
Table 1: A weed control
% weed control (Palmer % weed control (Kochia)
Rate of Amaranth)
Treatment application
7 days 14 days 21 days 7 days 14 days 21 days
Example 14 0.61 lb/A 36.7 83.3 90.0 43.3 86.7 90.0
Example 14 0.835 lb/A 43.3 90.0 90.0 46.7 90.0 90.0
Market sample 0.73 lb/A 26.7 63.3 53.3 30.0 56.7 56.7
Example 15 0.61Ib/A 22.4 45.7 30.3 21.1 37.4 26.5
Example 15 0.835 lb/A 25.7 50.3 34.6 23.5 40.2 31.8
Example 16 0.61Ib/A 25.3 51.2 37.8 24.3 45.6 36.5
Example 16 0.835 lb/A 28.2 58.3 51.1 27.5 48.7 39.2
The field-testing results as shown in the above table evidently reveal that
the
compositions according to the present invention is extremely effective for
weed
control in arid region. It has been noted that due to natural adaption of the
weeds
to the arid conditions, they are tougher than those growing under normal
conditions
CA 03101106 2020-11-20
WO 2019/224639
PCT/IB2019/053769
22
and was difficult to control. Further these weeds displayed thick and waxy
cuticle
layers defending them from the penetration of the herbicide spray. It has been
noted that the commonly used glufosinate based formulations and market sample
of glufosinate were not providing an effective weed control in arid regions.
The
inventive compositions even at a low rate, is found to be highly efficacious
in
controlling tough weeds in the area.
The instant invention is more specifically explained by above examples.
However,
it should be understood that the scope of the present invention is not limited
by the
examples in any manner. It will be appreciated by any person skilled in this
art that
the present invention includes aforesaid examples and further can be modified
and
altered within the technical scope of the present invention.
