CN114521560A - Synergistic composition for herbicide and application thereof - Google Patents
Synergistic composition for herbicide and application thereof Download PDFInfo
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- CN114521560A CN114521560A CN202210424625.5A CN202210424625A CN114521560A CN 114521560 A CN114521560 A CN 114521560A CN 202210424625 A CN202210424625 A CN 202210424625A CN 114521560 A CN114521560 A CN 114521560A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
- A01N43/02—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms
- A01N43/04—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom
- A01N43/14—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom six-membered rings
- A01N43/16—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom six-membered rings with oxygen as the ring hetero atom
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/02—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing liquids as carriers, diluents or solvents
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
- A01N37/36—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids
- A01N37/38—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids having at least one oxygen or sulfur atom attached to an aromatic ring system
- A01N37/40—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids having at least one oxygen or sulfur atom attached to an aromatic ring system having at least one carboxylic group or a thio analogue, or a derivative thereof, and one oxygen or sulfur atom attached to the same aromatic ring system
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N57/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic phosphorus compounds
- A01N57/18—Biocides, pest repellants or attractants, or plant growth regulators containing organic phosphorus compounds having phosphorus-to-carbon bonds
- A01N57/20—Biocides, pest repellants or attractants, or plant growth regulators containing organic phosphorus compounds having phosphorus-to-carbon bonds containing acyclic or cycloaliphatic radicals
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/08—Magnoliopsida [dicotyledons]
- A01N65/10—Apiaceae or Umbelliferae [Carrot family], e.g. parsley, caraway, dill, lovage, fennel or snakebed
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/08—Magnoliopsida [dicotyledons]
- A01N65/22—Lamiaceae or Labiatae [Mint family], e.g. thyme, rosemary, skullcap, selfheal, lavender, perilla, pennyroyal, peppermint or spearmint
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/08—Magnoliopsida [dicotyledons]
- A01N65/24—Lauraceae [Laurel family], e.g. laurel, avocado, sassafras, cinnamon or camphor
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Abstract
The invention provides a synergistic composition for herbicide and application thereof, wherein the synergistic composition is composed of isopropanol, volatile oil, water, salicylic acid and alginic acid. The application of the synergistic composition is specifically that the synergistic composition is applied after being mixed with a herbicide in a tank. The synergistic composition comprises isopropanol, volatile oil, salicylic acid and alginic acid, and the volatile oil and water can be better combined together under the action of the isopropanol, so that the synergistic composition is integrally attached to the surface of a blade, and the absorption of weeds to herbicides is promoted; the synergistic composition is used after being mixed with the herbicide in a barrel, so that the absorption of the herbicide by weeds can be effectively improved, the herbicide can fully exert the weeding effect, and the dosage of the herbicide is reduced.
Description
Technical Field
The invention relates to the technical field of herbicide synergism, and particularly relates to a synergistic composition for a herbicide and application thereof.
Background
Glyphosate is a systemic herbicide with broad spectrum, and mainly interferes protein synthesis through inhibiting the action of synthetase in weeds, so that weeds die. The glyphosate plays a role after being conducted, so the glyphosate has a slow effect, generally takes effect within 5 to 7 days, and weeds slowly die after about 15 days.
Glufosinate is a contact herbicide, has broad spectrum, can be quickly absorbed by stems and leaves and enter weed bodies when being sprayed on weeds, and causes the metabolic process of the weeds to be disordered by inhibiting the activity of glutamine synthetase, so that the weeds are withered; the glufosinate-ammonium has high weed killing speed, and the whole plant can die in 1-2 weeks.
With the increase of the use time of glyphosate and glufosinate, the drug resistance of weeds is gradually strengthened, and in order to meet the weeding requirements, the increase of the pesticide dosage becomes a main mode for achieving the weeding effect.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a synergistic composition for a herbicide and application thereof, wherein the synergistic composition comprises isopropanol, volatile oil, salicylic acid and alginic acid, and the volatile oil and water can be better combined together under the action of the isopropanol, so that the synergistic composition is integrally attached to the surface of a blade, and the absorption of the herbicide by weeds is promoted; the synergistic composition and the herbicide are used after being mixed in a barrel, so that the absorption of the herbicide by the weeds can be effectively improved, the herbicide can fully exert the weeding effect, and the dosage of the herbicide is reduced.
The technical scheme of the invention is as follows:
a synergistic composition for herbicide is prepared from isopropanol, volatile oil, water, salicylic acid and alginic acid.
Further, the synergistic composition for the herbicide comprises the following components in parts by weight per 100 parts of the synergistic composition:
20-30 parts of isopropanol, 15-20 parts of volatile oil, 4-8 parts of salicylic acid, 8-12 parts of alginic acid and the balance of water.
Further, the synergistic composition for the herbicide comprises the following components in parts by weight per 100 parts of the synergistic composition:
25 parts of isopropanol, 17 parts of volatile oil, 6 parts of salicylic acid, 10 parts of alginic acid and 42 parts of water.
Further, the volatile oil is one of angelica dahurica oil, perilla leaf oil or camphor oil.
Further, the preparation method of the synergistic composition for the herbicide comprises the following steps: uniformly mixing isopropanol with the volatile oil to obtain a solution I for later use; mixing water with salicylic acid and alginic acid to obtain a solution II for later use; adding the solution I into the solution II, and stirring uniformly under the condition of 300-400r/min to obtain the synergistic composition.
Further, the application of the herbicide is specifically to apply the synergistic composition after the synergistic composition is mixed with the herbicide in a tank.
Furthermore, when in application, the synergistic composition and the herbicide are mixed according to the weight ratio of 1:10-20, so that the weeding effect can be effectively improved.
Further, when in use, the weight ratio of the synergistic composition to the herbicide is 1: 15.
The wax layer is located the plant surface, can play the effect of moisturizing, radioresistance, insect pest resistance to the plant, and simultaneously, the wax layer can make the plant produce certain obstacle to the weedicide, influences the adhesiveness and the absorptivity of pesticide.
The isopropanol, the water phase and the oil phase form a water-in-oil structure, and after the water-in-oil structure reacts with wax on the surface of the blade, the mobility of the herbicide on the surface of the blade can be improved, so that the adsorption and absorption of the herbicide on the surface of the blade are promoted, the absorption efficiency of weeds on the herbicide is improved, and the weeding effect is improved.
Compared with the prior art, the invention has the beneficial effects that:
1. in the synergistic composition provided by the invention, the isopropanol is used for combining the water phase and the oil phase into a whole, so that the defects of mutual exclusion and difficult combination generated after the synergistic composition is combined with the herbicide are avoided, the degree of matching of the synergistic composition and the herbicide is improved, and the weeding performance of the herbicide is further improved.
2. In the synergistic composition provided by the invention, salicylic acid and alginic acid are used simultaneously, so that the absorption of weeds to the herbicide can be effectively improved, and the weeding performance of the herbicide is effectively improved.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The developed root system of the eleusine indica, the annual herbaceous plant has stronger competitive power compared with the crop, the eleusine indica grows vigorously through the superior water absorption performance and nutrient absorption performance, and the plant is higher than the crop generally to interfere the growth of the crop; the leaf sheath of Eleusine indica has two flattened sides with ridge, and has no hair or can dredge wart hair.
Erigeron breviscapus, also called erigeron breviscapus, annual herbaceous plants have high spreading speed and secrete allelochemicals to inhibit the growth of crops, so that the growth and the yield of the crops are seriously influenced.
The above two grasses, which have been difficult to treat in the field, still did not achieve satisfactory results when treated with glyphosate and glufosinate, probably due to their longer appearance years, and their resistance became stronger with the increase of the use time of glyphosate and glufosinate, and therefore, even at increased dosages, the desired effects were not achieved.
In the following examples and comparative examples of the present invention, the level of the synergistic effect of the synergistic composition is determined by taking eleusine indica and erigeron breviscapus as experimental subjects and taking glyphosate and glufosinate-ammonium as herbicides, and the level of the synergistic effect is specifically seen in the examples and comparative examples.
Radix angelicae oil: purchased from Shenzhen ancient cooking plant spice, Inc.;
perilla leaf oil: purchased from Jiangxi vegetable and vegetable industries, Ltd;
camphor oil: purchased from Jiangxi vegetable and vegetable industries, Inc.;
isopropyl alcohol: purchased from Tubang chemical Co., Ltd, Yangzhou;
salicylic acid: purchased from chemical products, ltd, wanhai, south of the river;
alginic acid: purchased from Shandong Guante bioengineering, Inc.
Example 1
A synergistic composition for herbicides, consisting of, per 100kg of synergistic composition: 25kg of isopropanol, 17kg of angelica oil, 6kg of salicylic acid, 10kg of alginic acid and 42kg of water.
The preparation method of the synergistic composition for the herbicide comprises the following steps: placing isopropanol and volatile oil in a stirring kettle A, and mixing at 150r/min for 30min to obtain solution I for later use; putting water, salicylic acid and alginic acid into a stirring kettle B, and mixing for 10min at the speed of 350r/min to obtain a solution II for later use; and adding the solution I into the solution II in the stirring kettle B under the condition of continuous stirring, and continuously mixing for 20min to obtain the synergistic composition.
Mixing the synergistic composition and glufosinate-ammonium according to a weight ratio of 1:15 to obtain a tank mix, and calculating according to 3g/100m of glufosinate-ammonium2The amount of glufosinate-ammonium used was diluted from the tank mix for use.
Example 2
A synergistic composition for herbicides, consisting of, per 100kg of synergistic composition: 20kg of isopropanol, 15kg of perilla leaf oil, 8kg of salicylic acid, 12kg of alginic acid and 45kg of water; the preparation method is the same as example 1.
Mixing the synergistic composition and glufosinate-ammonium according to a weight ratio of 1:10 to obtain a tank mix, and calculating by glufosinate-ammonium according to a ratio of 3g/100m2The amount of glufosinate-ammonium used was diluted from the tank mix for use.
Example 3
A synergistic composition for herbicides, consisting of, per 100kg of synergistic composition: 30kg of isopropanol, 20kg of camphor oil, 4kg of salicylic acid, 8kg of alginic acid and 38kg of water; the preparation method is the same as example 1.
Mixing the synergistic composition and glufosinate-ammonium according to a weight ratio of 1:20 to obtain a tank mix, and calculating by glufosinate-ammonium according to a ratio of 3g/100m2The amount of glufosinate-ammonium used was diluted from the tank mix for use.
Example 4
The difference from example 1 is that glufosinate-ammonium is replaced by glyphosate, and the dosage of glyphosate is 13g/100m2。
Example 5
The difference from example 2 is that glufosinate-ammonium is replaced by glyphosate, and the dosage of glyphosate is 13g/100m2。
Example 6
The difference from example 3 is that glufosinate-ammonium is replaced by glyphosate, and the dosage of glyphosate is 13g/100m2。
Comparative example 1
In comparison with example 1, isopropanol was not added and the balance was made up with water.
Comparative example 2
In comparison with example 1, salicylic acid was not added and was made up with water.
Comparative example 3
In comparison with example 1, alginic acid was not added and the amount was made up with water.
Comparative example 4
In contrast to example 1, n-propanol was used instead of isopropanol.
Comparative example 5
The difference from example 1 is that the synergistic composition is mixed with glufosinate in a weight ratio of 1:21 to obtain a tank mix and is present in an amount of 3g/100m calculated as glufosinate2The tank mixture was diluted with glufosinate ammonium in an amount to be ready for use.
Comparative example 6
The difference from example 1 is that the synergistic composition is mixed with glufosinate in a weight ratio of 1:9 to obtain a tank mix and is present in an amount of 3g/100m calculated as glufosinate2The amount of glufosinate-ammonium used was diluted from the tank mix for use.
Comparative example 7
The difference from example 1 is that the synergistic composition is mixed with glufosinate in a weight ratio of 1:8 to obtain a tank mix and is present in an amount of 3g/100m calculated as glufosinate2The amount of glufosinate-ammonium used was diluted from the tank mix for use.
Comparative example 8
The difference from example 1 is that the synergistic composition is mixed with glufosinate in a weight ratio of 1:7 to obtain a tank mix and is present in an amount of 3g/100m calculated as glufosinate2The amount of glufosinate-ammonium used was diluted from the tank mix for use.
Comparative example 9
Compared with the example 1, the preparation method comprises the steps of simultaneously adding the isopropanol, the volatile oil, the water, the salicylic acid and the alginic acid into a container, and stirring the mixture to be uniform under the condition of 350 r/min.
Test of
Area division:
experiment area:
dividing the goosegrass herb into 15 cells, wherein the size of each cell is 8 meters multiplied by 8 meters;
dividing the erigeron breviscapus into 15 cells, wherein the size of each cell is 8 meters multiplied by 8 meters;
control zone:
dividing 3 cells with the size of 8 m multiplied by 8 m to be used as a contrast area 1, a contrast area 2 and a contrast area 3; control area 1 was sprayed with the same amount of glufosinate solution as in example 1, using water instead of the synergistic composition of example 1; control area 2 was sprayed with an equal amount of glyphosate solution as in example 4, using water instead of the synergistic composition of example 4; control zone 3 was treated with clear water.
The formulations provided in examples 1 to 6 and comparative examples 1 to 9 were used to treat eleusine indica and erigeron breviscapus, the growth state of the eleusine indica and erigeron breviscapus was recorded by regular observation after the treatment, and the herbicidal activity was investigated and recorded by a growth inhibition investigation method 14 days after the treatment, the fresh weight of weeds was recorded, and the fresh weight control effect was calculated, and the results are shown in tables 1 and 2.
Sample preparation: during sample collection, 30 plants are randomly collected as a whole in each cell for calculation; collecting 30 plants, cleaning roots, airing and weighing;
fresh weight control was recorded according to the following formula:
E（%）=（C-T）×100/C
in the formula, E represents fresh weight control effect,%;
c is the fresh weight of the weeds in the control area 3, g;
t is the fresh weight of weeds in the experimental area, g.
TABLE 1 tank-mixed synergistic composition with glufosinate-ammonium for controlling fresh weight of goosegrass herb and horseweed herb
TABLE 2 tank-mixing synergistic composition with glyphosate and controlling effect on fresh weight of eleusine indica and erigeron breviscapus
As can be seen from table 1, after the preparation provided in examples 1 to 3 was sprayed for 14 days, the fresh weight control effect of goosegrass was not less than 90%, and the fresh weight control effect of erigeron breviscapus was not less than 92%, while in combination with the fresh weight control effect (72.3%) of goosegrass and the fresh weight control effect (79.9%) of goosegrass in the control area 1, it can be seen that the herbicidal effect of glufosinate on goosegrass and erigeron breviscapus was significantly improved after the synergistic composition was used;
as can be seen by combining table 2, after the preparation provided by the spray examples 4-6 is sprayed for 14 days, the fresh weight control effect of eleusine indica is more than or equal to 90%, and the fresh weight control effect of erigeron breviscapus is more than or equal to 37%, while the fresh weight control effect (78.2%) of eleusine indica and the fresh weight control effect (0.4%) of erigeron breviscapus in the control area 2 are combined, so that the weeding effect of the glyphosate is remarkably improved after the synergistic composition is used;
as can be seen by combining the fresh weight loss rate of the preparation provided by the spraying comparative examples 1-4 in the table 1 after 14 days, the technical scheme of the invention is an integral body, the synergistic composition can act only when all raw materials coexist, and the effect of the invention can not be achieved when any raw material is planed or replaced;
as can be seen in combination with the fresh weight loss ratios after 14 days of spraying the formulations provided in comparative examples 5-8 in table 1, the weight loss ratios were improved compared to control zone 1 below the given synergistic composition to herbicide ratio, but were reduced more compared to example 1; after a higher ratio of synergistic composition to herbicide than given, the weight loss was improved compared to control zone 1, but was reduced more compared to example 1; therefore, the addition proportion of the synergistic composition which can exert the effect of the herbicide to the maximum is provided, and the synergistic composition can effectively improve the weeding capability of the herbicide in a given interval.
Although the present invention has been described in detail by referring to the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (8)
1. A synergistic composition for herbicide is characterized by comprising isopropanol, volatile oil, water, salicylic acid and alginic acid.
2. A synergistic composition as claimed in claim 1, which comprises the following components in parts by weight per 100 parts of synergistic composition:
20-30 parts of isopropanol, 15-20 parts of volatile oil, 4-8 parts of salicylic acid, 8-12 parts of alginic acid and the balance of water.
3. A synergistic composition as claimed in claim 2, which comprises the following components in parts by weight per 100 parts of synergistic composition:
25 parts of isopropanol, 17 parts of volatile oil, 6 parts of salicylic acid, 10 parts of alginic acid and 42 parts of water.
4. A synergistic composition as claimed in any one of claims 1 to 3, wherein the volatile oil is one of dahurian angelica oil, perilla leaf oil or camphor oil.
5. A synergistic composition for herbicides according to claim 1 which is prepared by the following process: uniformly mixing isopropanol with the volatile oil to obtain a solution I for later use; mixing water with salicylic acid and alginic acid to obtain a solution II for later use; adding the solution I into the solution II, and stirring uniformly under the condition of 300-400r/min to obtain the synergistic composition.
6. Use of a synergistic composition as claimed in claim 1, wherein the synergistic composition is applied after tank-mixing with the herbicide.
7. The use of a synergistic composition for herbicides according to claim 6, wherein the synergistic composition is mixed with the herbicide in a weight ratio of 1:10 to 20 during the use.
8. Use of a synergistic composition for herbicides according to claim 7 wherein the weight ratio of synergistic composition to herbicide is 1: 15.
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