45 results about "2-Methyl-4-chlorophenoxyacetic Acid" patented technology

The invention relates to a Pucaoke composition and use thereof. The Pucaoke composition includes a component A and a component B, wherein the component A is a compound shown as chemical formula (I) and all isomers or salts and hydrates thereof available for weeding; and the component B is at least one of 2-methyl-4-chlorphenoxyacetate, 2-methyl-4-chlorophenoxyacetic acid, 2-methyl-4-chloro-phenol ethyl thioester, MCPB, 2-methyl-4-chlorophenoxypropionic acid, 2-methyl-4-sodium chlophenoxycetate, isooctyl-2-methyl-4-chlorphenoxyacetate, butyl 2, 4- dichlorophenoxyacetate, isooctyl-2, 4-dichlorophenoxyacetate, 2, 4-dichlorophenoxyacetic acid, 4-(2, 4-dichlorophenoxy)propionic acid or salts or hydrates of the compounds. The composition provided by the invention is a low-cost, long-acting and broad-spectrum herbicide.

The present invention is the method of treating phenol-containing effluent and recovering resource in 2-methyl-4-chlorophenoxyacetic acid (MCPA) as one farm herbicide. The steps includes: filtering of the effluent, macroporous resin adsorption in adsorbing tower and biochemical treatment of the adsorbed water before discharge; desorbing regeneration of adsorbed macroporous resin with orthocresol as desorption agent; and pH regulation and separation of the desorption agent liquid to obtain orthocresol, which is returned to production, water phase, which is returned to waste water treatment, and low concentration desorption liquid, which is reused. The said process can result in phenol concentration in the effluent below 5 mg / L, phenol eliminating rate higher than 99% and phenol recovering rate greater than 80%.

The invention discloses a synthetic method of 2-methyl-4-chlorophenoxyacetic acid and relates to the technical field of organic synthesis. According to the method, o-methylphenol used as a raw material reacts with sodium chloroacetate under the action of sodium methylate; then, a reaction product is neutralized with hydrochloric acid to obtain an intermediate 2-methylphenoxyacetic acid; and finally, the intermediate is subjected to chlorination with sulphone chloride to obtain a target product 2-methyl-4-chlorophenoxyacetic acid. According to the invention, sodium methylate replaces sodium hydroxide to undergo neutralization. The neutralization reaction is relatively thorough, and there are few by-products, thus being beneficial to raise content and yield of the product. In addition, sulphone chloride is used for chlorination. The reaction is a water-free reaction, and generation of lots of phenolic wastewater is minimized. Thus, the reaction meets requirements of modern green pesticides. In addition, reaction temperature is relatively low, thus reducing energy consumption. In comparison with original technologies, the reaction technology has obvious advantages of high yield, less ''three wastes (waste gas, wastewater and industrial residue)'' and low energy consumption.

The invention belongs to the field of biological repair of environmental pollution, and particularly relates to a 2-methyl-4-chlorophenoxyacetic acid weedicide degrading bacterium SE08, and a screening method and application thereof. The 2-methyl-4-chlorophenoxyacetic acid weedicide degrading bacterium SE08 is Enterobacter sp. of which the collection number is CGMCC No.7016 and the collection date is 2012.12.18; and the 2-methyl-4-chlorophenoxyacetic acid weedicide degrading bacterium SE08 is collected at China General Microbiological Culture Collection Center. The invention also discloses a screening method and application of the 2-methyl-4-chlorophenoxyacetic acid weedicide degrading bacterium SE08. The 2-methyl-4-chlorophenoxyacetic acid weedicide degrading bacterium SE08 is obtained by primarily screening in 2-methyl-4-chlorophenoxyacetic acid heavily-polluted soil in the tobacco growing area in Chenzhou City of Hunan Province, rescreening and separation purification; and the degrading bacterium can effectively degrade 2-methyl-4-chlorophenoxyacetic acid residues in the environment, and is applicable to biological repair in 2-methyl-4-chlorophenoxyacetic acid polluted soil and water.

The invention provides a 2-methyl-4-chlorophenoxyacetic acid preparation method, which comprises: carrying out a condensation reaction on sodium o-cresolate and sodium chloroacetate under the catalysis of a trimethylamine catalyst to obtain 2-methyl sodium phenoxyacetate, acidifying, and chlorinating to obtain 2-methyl-4-chlorophenoxyacetic acid. According to the present invention, under the catalysis of the trimethylamine catalyst, sodium o-cresolate and sodium chloroacetate can be subjected to the condensation reaction in the near-neutral environment with the temperature of lower than 70 DEGC, such that the main side reaction for hydrolyzing sodium chloroacetate into sodium glycolate is greatly reduced, the produced wastewater contains less o-methylphenol and glycolic acid (or sodium glycolate) so as to easily meet the nationally acceptable emission standards at a low treatment cost, the resource utilization of the waste acid solution can be achieved, the cost of the raw materials and the three-waste treatment cost are reduced, the purity of 2-methyl-4-chlorophenoxyacetic acid is higher than 95%, and the total yield is higher than 93%.

The invention discloses a method for treating acid wastewater of 2-methyl-4-chlorophenoxyacetic acid through extraction, neutralization and distillation integration. The method is characterized by comprising the following steps of: performing liquid-liquid extraction on the acid wastewater by taking diethyl ether as an extracting agent to extract organic impurities from the acid wastewater; distilling a diethyl ether layer under reduced pressure, and recovering the diethyl ether serving as the extracting agent for recycling; adding NaOH into an aqueous phase, neutralizing, distilling, concentrating to obtain a NaCl concentrated solution, cooling, and filtering to obtain NaCl crystals; and collecting organic substances remained after the diethyl ether is recovered, accumulating, separating and recovering useful ingredients in the organic substances, returning a filtrate to the acid wastewater, and continuing to extract NaCl. By the method, 213kg of white NaCl crystals can be obtained from each ton of acid wastewater; and the product meets industrial-grade NaCl standard. The NaCl and the organic substances in the acid wastewater of the 2-methyl-4-chlorophenoxyacetic acid can be effectively separated and extracted; the process is simple, easy and low in energy consumption, and a method which can be industrially applied is used for comprehensively treating the acid wastewater of the 2-methyl-4-chlorophenoxyacetic acid; and the purity of the NaCl is high.

The invention relates to a herbicide composition, wherein component A is nicosulfuron, component B is bromoxynil, and component C is a hormone herbicide; and the weight portion ratio of the three active components is 1 to 1-30 to 1-30. The hormone herbicide is 2, 4-D, 2-methyl-4-chlorophenoxyacetic acid, dicamba or fluroxypyr and so on. The herbicide composition has obvious synergistic action and is particularly suitable for preventing and killing grassy and broad leaved weeds in corn fields.

The invention relates to a herbicide composition for a wheat field. The herbicide composition contains effective components including florasulam, aminopyralid (or salt compounds of aminopyralid) and a phenoxy carboxylic acid herbicide, wherein the phenoxy carboxylic acid herbicide is one selected from 2-methyl-4-chlorophenoxyacetic acid, 2-methyl-4-chlorophenoxyacetic acid sodium salt, 2-methyl-4-chlorophenoxyacetic acid-isooctyl, 2,4-D, 2,4-D butyl ester and 2,4-D isooctyl ester. The herbicide composition disclosed by the invention has a synergistic effect and is remarkably better than each independently-used agent in effect on preventing and removing annual weeds in the wheat field; and by using the herbicide composition, the herbicide controlling spectrum is widened, meanwhile, the dosage is reduced, the generation of herbicide resistance of the weeds is delayed, and the environment pollution is relieved.

The invention discloses a 2-methyl-4-chlorophenoxyacetic acid preparation technology. The technology is characterized in that a series of reactions comprising a condensation reaction of o-cresol, sodium hydroxide and water, a sodium modifying reaction of sodium hypochlorite, an acidulation reaction of hydrochloric acid and the like are carried out, and the pH value of 2-methyl-4-chlorophenoxyacetic acid in the acidulation reaction of hydrochloric acid is 5, so production and use demands are satisfied. The above improved technology substitutes a traditional technology utilizing pure benzene and chlorine, so the safety of 2-methyl-4-chlorophenoxyacetic acid in the preparation is increased. An o-cresol recovery operation is added for recovering o-cresol used in the above reaction, a platinum resistance thermometer arranged in a condensation reaction vessel is used for detecting the temperature in the condensation reaction vessel in the late stage of the above reactions, an enamel reaction vessel heating vessel body connected with the enamel reaction vessel is controlled when the temperature of the platinum resistance thermometer is higher than preset 90DEG C, and o-cresol for recovery is obtained through an enamel condenser connected with the enamel reaction vessel to improve the resource utilization rate.

The invention relates to a weeding compound containing glyphosate. The weeding compound comprises an active ingredient A, an active ingredient B and the balance of pesticide additive, wherein the molar ratio of active ingredient A to active ingredient B is (1-30):(30-1); the total weight of the active ingredient A and the active ingredient B is 33%-86% of the weight of the compound; the active ingredient A is one of glyphosate and glyphosate salt; the active ingredient B is one of glufosinate-ammonium, fomesafen, oxyfluorfen, trichlopyr, 2,4-dichlorphenoxyacetic acid, 3,6-dichloro-2-methoxybenzoic acid, 2-methyl-4-chlorophenoxyacetic acid or the salt thereof. The invention has the advantages that the components of the active ingredients of the weeding compound containing glyphosate are changed so that the weeding compound containing glyphosate is in various forms, the preventing and controlling effect of the combination is obviously better than that of single use, the dosage is reducedand the pesticide cost is reduced.

The invention relates to the technical field of pesticide and particularly relates to a 2-methyl-4-chlorophenoxyacetic acid salt water-soluble granular preparation and a preparation method thereof. The 2-methyl-4-chlorophenoxyacetic acid salt water-soluble granular preparation is prepared from 2-methyl-4-chlorophenoxyacetic acid salt, a surfactant and water-soluble filler. According to the 2-methyl-4-chlorophenoxyacetic acid salt preparation, by adjusting the selection and proportion of components, the suspended rate of the preparation can be improved and the disintegration time and foaming can be reduced. All the indexes of the product are excellent and the physicochemical property is stable. Experiments proved that the suspended rate of the 2-methyl-4-chlorophenoxyacetic acid salt water-soluble granular preparation is obviously higher than that of the existing products and the disintegration time is obviously lower than that of the existing products. According to the preparation method of the 2-methyl-4-chlorophenoxyacetic acid salt water-soluble granular preparation, the 2-methyl-4-chlorophenoxyacetic acid salt water-soluble granular preparation is directly prepared from the 2-methyl-4-chlorophenoxyacetic acid salt, surfactant and water-soluble filler through mixing granulation, the requirement on instruments and equipment can be lowered, the preparation technology is simplified, the preparation flows can be shortened, the energy consumption can be reduced, and the yield is improved.

The invention discloses a production process of 2-methyl-4-chlorophenoxyacetic acid. The production process comprises the following steps: carrying out the procedures of perborate formation, condensation, chlorination, salt formation and the like on o-cresol, chloroacetic acid, dichloroethane and the like served as raw materials, recovering o-cresol by external circulation rectification under vacuum, and recycling o-cresol and water; performing reverse chlorination with an external circulation solvent to prepare 2-methyl-4-chlorophenoxyacetic acid. By adopting the production process, the chlorination efficiency is increased effectively, so that no waste water is discharged in production, chlorine gas consumption and industrial organic waste residue production are reduced, and green production is realized. The production process has a good social benefit.

The invention discloses a synthetic method of 2-methyl-4-chlorophenoxyacetic acid, and relates to the technical field of organic synthesis. The target product 2-methyl-4-chlorophenoxyacetic acid is prepared by taking o-methylphenol as a raw material, reacting with sodium chloroacetate udner the effect of sodium bicarbonate; neutralizing by hydrochloric acid to obtain a midbody 2-methyl phenoxyacetic acid; finally, chloridizing the midbody 2-methyl phenoxyacetic acid by chlorine. The method applies sodium bicarbonate to replace sodium hydroxide to carry out neutralization, the neutralization reaction is small in heat release and few in side product; the method is good for improving product content and yield; besides, the chorine is applied to chloridize, and methylbenzene is used as the solvent; the generated acid is used as the neutralizing acid of the next batch, thus the massive phenolic wastewater is reduced, and it can meet the requirement of modern green pesticide; carbon dioxideis discharged from the neutralization reaction, the reaction heat is reduced, and the energy consumption is reduced. Compared with an original technique, the reaction technique has obvious advantagesof high yield, few wastes and low energy consumption.

The invention discloses a method for producing 2-methyl-4-chlorophenoxyacetic acid esters. 2-methyl phenoxyacetic acid is reacted with chlorine introduced into an alcoholic solvent (corresponding to the alcoholic part of an ester target product) to form finished products of the 2-methyl-4-chlorophenoxyacetic acid esters in the presence of phenothiazine and dimethylamino pyridine catalysts. The 2-methyl phenoxyacetic acid is reacted in a reaction kettle, and the finished products of the 2-methyl-4-chlorophenoxyacetic acid esters can be directly produced without separation of the intermediate 2-methyl-4-chlorophenoxyacetic acid. The total yield of the finished products of the 2-methyl-4-chlorophenoxyacetic acid esters is improved to over 92 percent, and the content of effective ingredients is improved to over 93 percent.

The invention discloses a dimethylamine salt of 2-methyl-4-chlorophenoxyacetic acid. The specific process steps are as follows: 1. adding chloroacetic acid to a reaction kettle, and dripping caustic soda solution to generate sodium chloroacetate; Phenol is added to another reactor, and caustic soda solution is added dropwise to generate sodium o-cresol; 3, the sodium chloroacetate of the previous kettle is added dropwise to the sodium o-cresol reactor of the next kettle to generate sodium 2-methylphenoxyacetate; 4. Transfer the above reaction materials into a chlorination reaction kettle, add hydrochloric acid to generate 2-methylphenoxyacetic acid crystals, add a mixed solvent of xylene and dichloroethane to dissolve the crystals into a solution, and carry out chlorination in the chlorination reaction kettle Reaction, generate 2-methyl-4-chlorophenoxyacetic acid, then transfer to the crystallization tank for crystallization, then put it into a centrifuge for centrifugation, and dry it into crystals after centrifugation; 4 Chlorine, dimethylamine aqueous solution and water are respectively added in the salt-forming reactor to generate the product 2-methyl-4-chlorophenoxyacetic acid dimethylamine salt. The preparation process has few reaction steps, safe process, high efficiency, short cycle and low cost.

The invention discloses a high-concentration dimethyl tetrachloro dimethylamine brine agent and a preparation method thereof. The key point of the technical scheme thereof is that the brine agent contains the following components in parts by weight: 60-70 parts of 2-methyl-4-chlorophenoxyacetic acid, 30-40 parts of 40% dimethylamine and 0.5-5.5 parts of modified tea saponin. The dimethyl tetrachloro dimethylamine salt associated complex is formed after 2-methyl-4-chlorophenoxyacetic acid reacts with dimethylamine, and then the modified tea saponin is added, so that the affinity of the 2-methyl-4-chlorophenoxyacetic acid, the dimethylamine and the plant surface is enhanced, the contact angle between the brine agent and the stem leaf surface is reduced, the wetting function of the brine agent and the stem leaf surface is benefited and the brine agent is suitable for an environment with relatively low temperature.

The invention relates to the field of pesticide preparations and discloses a wheatland weeding composition. The wheatland weeding composition disclosed by the invention comprises pyroxsulam and 2-methyl-4-chlorophenoxyacetic acid, wherein the mass ratio of the pyroxsulam to the 2-methyl-4-chlorophenoxyacetic acid is 1:(20-50). The invention further discloses a weed killer comprising the weeding composition disclosed by the invention and agrochemically acceptable auxiliary materials, wherein the weeding composition is 1-90% by weight of the weed killer. The weeding composition and a preparation thereof disclosed by the invention take the pyroxsulam and the 2-methyl-4-chlorophenoxyacetic acid as active components, the advantages of the two components are complemented mutually, so that weed pesticide resistance is retarded, environment pollution is reduced, meanwhile, the pesticide effect is improved; and grass weeds and broadleaf weeds are effectively controlled by applying pesticides once, therefore, usage amount, types and times of pesticides are reduced, and the wheatland weeding composition can be widely applied in the agricultural field.

The invention relates to a comprehensive remediation method of 2-methyl-4-chlorophenoxyacetic acid herbicide contaminated soil in tobacco-rice rotation zones, belonging to the remediation technology of contaminated soil. The method is characterized by deeply ploughing the 2-methyl-4-chlorophenoxyacetic acid herbicide contaminated soil after preceding crops are harvested, and digging big holes, turning down the upper layer soil and applying 1500-1900kg / ha of biomass carbon before succeeding crops are transplanted; and spraying degrading bacterium SE08 liquid, wherein the concentration of the liquid is 1.5*1011cfu / L and the dosage is 40-60mL / hole. Through combined utilization of biological measures and physical measures, the effect of relieving phytotoxicity is good, so that the tobacco botanical growth environment of the contaminated soil returns to normal.

The invention discloses a 2-methyl-4-chlorophenoxyacetic acid preparation technology. The technology is characterized in that a series of reactions comprising a condensation reaction of o-cresol, sodium hydroxide and water, a sodium modifying reaction of sodium hypochlorite, an acidulation reaction of hydrochloric acid and the like are carried out, and the pH value of 2-methyl-4-chlorophenoxyacetic acid in the acidulation reaction of hydrochloric acid is 5, so production and use demands are satisfied. The above improved technology substitutes a traditional technology utilizing pure benzene and chlorine, so the safety of 2-methyl-4-chlorophenoxyacetic acid in the preparation is increased. An o-cresol recovery operation is added for recovering o-cresol used in the above reaction, a platinum resistance thermometer arranged in a condensation reaction vessel is used for detecting the temperature in the condensation reaction vessel in the late stage of the above reactions, an enamel reaction vessel heating vessel body connected with the enamel reaction vessel is controlled when the temperature of the platinum resistance thermometer is higher than preset 90DEG C, and o-cresol for recovery is obtained through an enamel condenser connected with the enamel reaction vessel to improve the resource utilization rate.

The invention provides a wheat zinc-selenium leaf fertilizer and preparation and application methods thereof; the wheat zinc-selenium leaf fertilizer is prepared from, by weight, 1-5 parts of sodium selenate, 100-300 parts of zinc sulfate, 50-55 parts of methamidophos, 1-5 parts of 2-methyl-4-chlorophenoxyacetic acid, 1-6 parts of polyvinylpyrrolidone, and 500-2000 parts of water. The wheat zinc-selenium leaf fertilizer is made just by weighing, according to formula quantities, sodium selenate, zinc sulfate, methamidophos, 2-methyl-4-chlorophenoxyacetic acid, polyvinylpyrrolidone and water and mixing well in a container. The application method of the wheat zinc-selenium leaf fertilizer comprises: diluting the wheat zinc-selenium leaf fertilizer with water at a ratio of 1:500 to 1:100, and spraying to wheat leaves respectively in wheat heading stage and blossoming stage. The wheat zinc-selenium leaf fertilizer provided herein can provide significantly increased zinc content and selenium content for wheat grains. The application method of the wheat zinc-selenium leaf fertilizer provided herein allows higher utilization rate than soil applied fertilizer; pesticide residue in soil is little, and pollution to soil and agricultural products is low.

The invention relates to a composite herbicide for wheat fields, and the composite herbicide comprises the following ingredients by weight: 10% of tribenuron methyl, 5.6% of 2-methyl-4-chlorophenoxyacetic acid sodium (MCPA-Na), 4.4% of sodium lignosulfonate, 30% of dairy 500, 15% of farming-benefiting penetrating agent A, 10% azone, 12% of kaolin and 13% of diatomite. The herbicide retains high activity of sulfonylurea herbicides, but also greatly reduces the use amount, and has the substantial advantages of being wide in herbicidal spectrum, high in herbicidal activity, safe to use, and free of phytotoxicity effects on sensitive next-stubble crops.

A herbicide composition containing l-alpha-terpineol is disclosed. The composition comprises a synergist a and a herbicide active component b, wherein the synergist is the l-alpha-terpineol, and the herbicide active component is one of 2-methyl-4-chlorophenoxyacetic acid, ametryn and diuron or is a mixture prepared from more than one of the 2-methyl-4-chlorophenoxyacetic acid, the ametryn and the diuron. The composition reduces the using amount of herbicides in unit area and improves weeding effects of herbicides for sugarcane fields and safety to sugarcane, thus reducing the herbicide using cost. The composition can be prepared into wettable powder, water dispersible granules, emulsifiable solutions or dispersible oil suspensions, and can be used for control of annual weeds in sugarcane fields.

The invention discloses a synthesis method of 2-methyl-4-chlorophenoxyacetic acid, and relates to the technical field of organic synthesis. The synthesis method comprises the following steps that methyl phenoxyacetic acid and methyl ethyl carbonate are added into a reaction kettle, chlorine is introduced for chlorination, and after washing, cooling crystallization, suction filtration and drying are conducted, the target product is obtained. According to the synthesis method of the 2-methyl-4-chlorophenoxyacetic acid, the methyl ethyl carbonate is adopted for replacing dichloroethane, so that by-products are few, and the synthesis method of the 2-methyl-4-chlorophenoxyacetic acid is beneficial for improving the content and the yield of the product; a large amount of waste acid is avoided, and the solvent (methyl ethyl carbonate) is environmentally friendly and non-toxic, and meets the requirements of modern green pesticides; compared with an original technology, a reaction technology has the obvious advantages of high yield, little three-waste and low energy consumption.

The invention provides an orange pedicel drop resisting preparation which is prepared from the following ingredients in parts by weight: one part of 2-methyl-4-chlorophenoxyacetic acid or 2-methyl-4-sodium chlorophenoxyacete or 2-methyl-4-amine chlorophenoxyacete, 10-20 parts of glycerinum and 40-50 parts of polyoxyethylene-8-octyl phenyl ether-100 (triton X-100). The orange pedicel drop resisting preparation is used for preventing drop of orange fruits before harvesting, and fruit drop before harvesting can be reduced by 64.1-87.4 percent. The preparation has a good effect of preventing pedicel drop of stored orange fruits and can be used for reducing the pedicel drop of the stored fruits by 94-100 percent.

The invention discloses a preparation technology of high-purity 2-methyl-4-chlorophenoxyacetic acid, comprising the following steps: (1) combining outer circulation rectification under vacuum and liquid-liquid layering and reusing ortho-cresol in sodium o-cresolate; (2) preparing 2-methyl-4-chlorophenoxyacetic acid by outer cycling solvent-process reverse chlorination; and (3) conducting coiled tubing preparation of 2-methyl-4-chlorodimethylamine salt. COD value of water during the treatment process is lower than 100 ppm, there is almost no loss of extraction absorbents and the extraction absorbents can be recycled; and by resource treatment of tail gas, annual output of 0.5 ton of dichloroethane with purity being 98% and above and 0.24 ton of ortho-cresol with purity being 97% and above is achieved.

The invention relates to the technical field of governing of waste gas, in particular to a method for governing waste gas in a 2-methyl-4-chlorophenoxyacetic acid workshop. The treatment method comprises the following steps: 1) introducing waste gas required to be governed into an alkali washing tower and performing alkali washing, and keeping pH in the tower to be constant in the process; (2) introducing the gas subjected to alkali washing into a primary water absorption tower, processing for certain time, and subsequently absorbing the surplus moisture through a demister and removing high-boiling residues by using a pretreatment device; (3) pressurizing the gas treated in the step (2), and subsequently introducing the gas into an activated carbon adsorption box through a machine; (4) enabling the gas treated in the step (3) into a condenser, fully condensing the gas into liquid, and enabling the liquid to enter into a layering tank; layering dichloroethane and then enabling the dichloroethane to enter into a storage tank, and enabling waste water to enter into a waste water system; and (5) enabling the gas treated in the step (4) to enter into a photocatalytic device and performing photocatalytic oxidation to obtain a final product. According to the treatment method provided by the invention, the dichloroethane in the waste gas can be effectively purified and recycled, the pollution is reduced, the environment is protected, and the resources are reduced.

The invention discloses an oat field weeding composition containing thifensulfuron-methyl and preparation and application methods thereof. Active components of the composition comprise 2-methyl-4-chlorophenoxyacetic acid, bromoxynil and the thifensulfuron-methyl; the mass ratio of the 2-methyl-4-chlorophenoxyacetic acid to the bromoxynil to the thifensulfuron-methyl is equal to (1 to 3) to (1 to 3) to (0.1 to 0.3). The weeding composition disclosed by the invention is dissolved into water in a utilization process and is sprayed on stems and leaves at a 3 to 4 leaf period of oat seedlings; theweeding composition can be used for effectively preventing and controlling broadleaf weeds of an oat field, such as chenopodiaceae and amaranthus retroflexus. The weeding composition provided by the invention has the characteristics of strong selectivity, high prevention effect, good safety and few residues.

The invention discloses an herbicide used before seeding. The herbicide containing the following components in percentage by weight: 1%-5% of 2,4-D-dimethylamine salt, 2%-8% of 2,4-D-ethyl acetate, 5%-10% of acetochlor, 2%-10% of ammonium sulfate, 20%-30% of bentazone, 5%-10% of 3,6-dichloroanisic acid, 5%-10% of chloridazon, 1%-2% of clomazone, 2%-5% of potassium dichloropyridine, 2%-5% of dicamba, 2%-5% of dichloromide, 2%-10% of dimethylphenyl thioxamide, 2%-5% of fluoroglycofen, 2%-3% of glyphosate and 2%-5% of 2-methyl-4-chlorophenoxyacetic acid. The herbicide can be used for removing multiple types of weeds, is efficient, low in toxicity, low in residue and free of pollution, and weeds do not need to be removed again in the growth periods of plants.

The invention discloses a 2-methyl-4-chlorophenoxyacetic acid and glyphosate compound herbicide which is characterized by mainly comprising the components in percentage by weight: 1-20% of 2-methyl-4-chlorophenoxyacetic acid isopropylamine, 1-10% of glyphosate isopropylamine, 1-20% of emulsifier and the balance of water. Due to the adoption of the proportion, the 2-methyl-4-chlorophenoxyacetic acid and glyphosate compound herbicide has a remarkable synergistic effect for grassy weeds, has an additive effect for broad leaf weeds such as chandali and can be used as a sterilant herbicide. Compared with the traditional herbicide, the 2-methyl-4-chlorophenoxyacetic acid and glyphosate compound herbicide has the advantages of brand new herbicide formulation, stronger pesticide effect, smaller dosage, good preventing effect, high weed killing speed and strong adaptability.

The invention discloses a method for removing a weed of a Manila sward. The method comprises the following steps of mixing 20wt% of fluroxypyr and 56wt% of 2-methyl-4-chlorophenoxyacetic acid powder with water for preparing, and then applying an obtained mixture to the Manila sward, wherein the mass ratio of the 20wt% of fluroxypyr to the 56wt% of 2-methyl-4-chlorophenoxyacetic acid powder to the water is 4: (2 to 3) to 4,000. Compared with a single agent, a compound preparation provided by the method for removing the weed of the Manila sward has a favorable synergistic effect.