Urea herbicide introduction

A herbicide derived from urea as the core structure.

Basic traits The main dosage form of these drugs is WP. For more soil treatment, applied to the soil easily absorbed by soil colloids and difficult to be washed, the soil in the effective period of several months to more than a year. Urea herbicides do not affect the germination of seeds. After the roots are absorbed, they flow upward along the transpiration stream in the xylem, accumulate in the leaves, and kill the weed sprouts. Urea herbicides have moderate toxicity.

The mechanism of action of cotton is more resistant to drugs. Sensitive plants such as celery, sorghum, and onions have low enzymolysis capacity and poor drug resistance. Urea herbicides are easily absorbed by the soil and are not easily leached. Photolysis is the basic route of disappearance in soil. In particular, long-term drought, the role of ultraviolet light is strong, and the activity declines rapidly. Herbicides have an adverse activity.

The application is mainly applicable to the control of alfalfa, crabgrass, acorn, wild oats and other annual grass weeds and monocotyledonous weeds in dryland crops such as cereals, corn, soybeans, cotton, peanuts, sugarcane, potatoes, tobacco, orchards. ; Sauron, fluorothione, etc. have special effects on annual, perennial weeds of Cinnabaraceae, such as cattle blankets, fireflies, flat-grassed cane grasses, and exotic sedges. The control of broadleaf weeds is superior to control of grassy weeds. Most of the urea herbicides are often used as post-emergence pre-emergence soil treatment agents for both killing and injuring, while S3552 is a soybean, peanut post-foliage treatment agent that controls a wide variety of broadleaf weeds. Tebuthiuron is used as a herbicide to control the effects of woody trees and shrubs. Urea herbicides are generally used in amounts of 1 to 2 kg per hectare. According to the data from the Kunming Institute of Agricultural Sciences, 1 month after rice transplanting, the activity of urea herbicides in controlling eye dish was: Ligulong> Diuron> Lvgu Long> Xiugu Long> Fumulong> Non-grass Long> Sanmu Long> Herbicide No. 1. Most urea herbicides are used as soil treatment agents, and their efficacy and duration are related to soil texture and organic matter content. Soil viscosity, organic matter content, adsorption is also strong, and the amount of soil used is larger than that of sandy soil and organic matter. After spraying, the temperature of 20~30°C and the moist soil are conducive to the exertion of efficacy. Low temperature and drought affect the exertion of efficacy. Urea herbicides are used in combination with other herbicides to enhance the effects of grass. For example, digluuron is used in combination with herbicidal ether, Ligulon is mixed with alachlor, prometryn or atrazine, and sedge and herbicide ether are used. Mixing is practical.

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