农田作物因杂草丛生而减产,受草害减产的程度同杂草种类、发生密度、分布状况和危害持续期有关。作物品种、种植密度、种植时间、生育期长短和耕作条件以及水肥管理对杂草的危害控制都有重要作用,因此,对农田草害的防除应根据具体情况,采取最经 Cropland crops due to overgrown and reduced production, the extent of grass damage reduction with weed species, the occurrence of density, distribution and duration of the hazards related. Crop varieties, planting density, planting time, the length of the growing season and farming conditions and the management of water and fertilizer on the weed control have an important role, therefore, the prevention and control of farmland grass damage should be based on specific circumstances, to take the most