Efficient agricultural herbicide

Abstract

The invention discloses an efficient agricultural herbicide which comprises isoproturon and a compound extracted and separated from the seed of cowherb.The compound is of a novel structure.The compound is reported for the first time.The invention further provides a preparation method of the compound.The preparation method comprises the steps of smashing dried herb of siebold buttercup, ethyl alcohol heat reflux extraction, solvent liquid-liquid extraction, ethyl acetate extract impurity removal through macroporous resin, separation of positive-phase silica gel and reverse-phase silica gel and the like.Test results prove that the herbicide can selectively restrain growth of annual grassy weed such as beckmannia syzigachne in wheat field and Japanese amur foxtail and other and broad-leaf weed such as starwort and malachium aquaticum.

Description

technical field [0001] The invention belongs to the field of agriculture, and in particular relates to a high-efficiency agricultural herbicide. Background technique [0002] Wheat, rice, corn, etc. are the most important food crops in my country. The level of food production is directly related to national food security, social stability and harmony. For wheat, the main crop species in the north, the disorderly growth of vicious weeds such as hardgrass, kanmai, Japanese kanmai, and weeds seriously affects the yield of wheat. Among them, in recent years, the area and severity of the damage caused by Aurantia miltiorrhiza and Weedgrass in Japan have increased year by year. In a few areas, the wheat yield of individual fields has lost as much as 20-30%, and the most serious fields have formed grass shortages. The damage is imminent and has become one of the most important problems in the field of wheat pest prevention. [0003] At present, the pesticides used against wheat g...

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Problems solved by technology

[0003] At present, the pesticides used against wheat grass weeds mainly include clodinafop-propargyl, fenoxaprop-p-ethyl, chlorotoluron, isoproturon and isoproturon·chlorotoluron, etc. It has been proved by the practice of production and application that these The pesticide has a good control effect on hard grass in the wheat field and ordinary Aurantium, but only 30-40% of the control effect on Japanese Amygrass and Azalea

Judging from the herbicide varieties currently on the market, so far there is no single agent or compound agent product with excellent control effect on wheat field oystergrass and japonica. When weeding, we can only mix and match different herbicides according to our own experience, which lacks scientificity, the control effect is unstable, and phytotoxicity often occurs, resulting in reduced wheat production.

[0004] In the prior art, some people try to use multi-component compound herbicides to solve the above problems. For example, Chinese patent 201210009678.7 discloses a three-component compound herbicide composition. Due to the unscientific allocation of the dosage of each component and three different molecules There is a certain conflict in the chemical composition of the structure, which leads to the unsatisfactory weeding effect in actual application. At the same time, the compound use of the three components greatly increases the difficulty and cost of actual application.

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