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杂草不但与农作物争养分,光照和水分,而且是病虫害的中间宿主或越冬场所,对农作物危害极大。用人工除草需要投入大量劳力,-旦除草不及时,容易造成草荒,招致减产。推广化学农药除草,可以解放农业劳动力,提高生产效率和产量。现介绍几种适用于蔬菜的除草剂使用技术。一、除草醚和草枯醚 这两种药剂为触杀型除草剂。主要防除一年生杂草的幼芽和幼苗,对成草防治效果差。这类药剂对出土的杂草幼芽有强烈的触杀作用,因此,最佳喷药期为播种后出苗前。由于这类药剂可为紫外线光照射所分解,并为土壤微生物吸收分解,故在土壤中残留期不长。
Weeds not only compete with crops, light and water, but also the intermediate host of pests or overwintering places, great harm to crops. Weeding with artificial need to invest a lot of labor, - Once the weeding is not timely, easily lead to wasteland, resulting in reduced production. Promote the chemical pesticide weeding, you can liberate the agricultural labor force, improve production efficiency and output. We now introduce several kinds of herbicides used in vegetables technology. First, weeding ether and grass withered ether these two agents as contact herbicide. The main control annual weeds sprouts and seedlings, into the grass control effect is poor. Such agents on the weeds germinated unearthed a strong role in contact, therefore, the best spraying period after sowing before emergence. As these agents can be decomposed by ultraviolet light irradiation, and soil microbial absorption and decomposition, so the residual period in the soil is not long.