Agricultural herbicide and preparation method thereof

Abstract

The invention discloses an agricultural herbicide and a preparation method thereof. The herbicide contains isoproturon and a compound which is obtained through extraction separation from semen cuscutae and novel in structure, and the compound is reported for the first time. The invention further provides a preparation method of the compound. The preparation method comprises the following steps: crushing dried mature seeds of the semen cuscutae, performing hot reflux extraction with ethanol, performing liquid-liquid extraction with a solvent, performing trash extraction with macroporous resin on an ethyl acetate extract, performing normal phase silica gel separation, performing antiphase silica gel separation and the like. Experiment results indicate that the herbicide provided by the invention can selectively restrain the growth of annual gramineous weeds including beckmannia syzigachne in wheat fields, alopecurus japonicus and the like, and the growth of broadleaf weeds including stellaria media, malachium aquaticum and the like.

Description

technical field [0001] The invention belongs to the field of agriculture, and in particular relates to an agricultural herbicide and a preparation method thereof. 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 us...

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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.

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