Bensulfuron-methyl and pyrazosulfuron were applied in wheat fields. The effect of weeding was greatly influenced by soil moisture and less affected by temperature.
Both bensulfuron-methyl and pyrazosulfuron are sulfonylurea herbicides. After being absorbed by weeds, such herbicides mainly affect the growth of the amino acids in the weeds and eventually kill them. The herbicidal effect of these two drugs is usually not affected by temperature and the efficacy is long-lasting. However, when the temperature is too low and the growth of weeds is extremely slow, the physiological metabolic activity of the weeds is weak, and the speed at which the herbicides work becomes significantly slower. Some weeds with high tolerance may degrade the herbicides and make them unable to reach The effect of herbicide ultimately affects the herbicidal effect.
In the case of sufficient water, especially in paddy fields, bensulfuron-methyl and pyrazosulfuron can diffuse rapidly in water, distribute evenly in the surface soil of farmland, be absorbed by the weeds' roots, and then be transferred to all parts of the weeds. Play a role. In dry fields such as wheat fields, when the soil is arid, the herbicide sprayed on the farmland cannot move with the water, and it is difficult to quickly form a tight, uniform, closed soil layer with a certain thickness after the application of pesticides. Absorption by weeds can seriously affect the effect of soil sealing and affect the weeding effect. Therefore, when these two herbicides are applied in wheat fields, soil moisture should be kept as good as possible, and if the soil is dry, the amount of water used should be increased, which will help improve the weed control effect. Choosing an appropriate sprayer for even and fine sprays is beneficial to the absorption of drugs on the weedy leaves and other parts of the ground, and it also helps to improve the weeding effect.
Tip: Both bensulfuron-methyl and pyrazosulfuron-methyl are selective systemic herbicides, with both soil sealing and stem and leaf treatments. Bensulfuron is absorbed by roots and leaves of weeds and transferred to various parts, blocking the biosynthesis of amino acids such as lysine and isoleucine and preventing cell division and growth. After phytotoxicity, the growth of sensitive weeds was hindered, young tissues became yellow prematurely, and the growth of the leaves and roots was blocked and necrosed. The use of a flexible method, available poisonous soil, poison sand, spray, pouring and other methods of spraying. The drug can bind tightly to the soil in a relatively short period of time, so the mobility in the soil is small, and the effect of temperature and soil quality on its weeding effect is small. Pylosulfuron-methyl and bensulfuron-methyl have a similar mechanism of action and herbicidal characteristics, broad spectrum herbicides, and have a good control effect on broad-leaved weeds, Cyperaceae weeds, alfalfa weeds and so on.
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