高寒阴湿区由于人少地多,耕作粗放及田间管理不善,致使有些地块农田杂草种类多、密度大,影响作物产量和品质的提高,造成作物产量低而不稳,严重制约了农业生产的发展。同时,杂草还是农田病虫鼠害的天然寄主,为病虫鼠害的越冬和繁殖创造了有利条件。减轻和消灭杂草为害,把草害造成的损失降到最低限度,是农技推广工作的主要内容之一。 Due to the lack of land, extensive cultivation and poor field management in the alpine wetlands, some weeds in some plots have many kinds of weeds and have large density, which affects the increase of crop yield and quality, resulting in low and unstable crop yield and severely restricting agriculture Production development. At the same time, weeds are also natural hosts of farmland pests and rodents, creating favorable conditions for the winter and reproduction of pests and diseases. Mitigation and elimination of weeds damage, the grass damage caused by the loss to a minimum, is one of the main contents of agricultural extension.