近年来,影响黑龙江省北部地区大豆产量的主要因素是重迎茬。据不完全统计,重茬面积占75%,迎茬面积占15%。由于重茬年限加长,除草剂的单一使用,杂草产生抗药性,或配方不当等原因,导致大豆田杂草群落演变,恶性杂草大面积滋生漫延,造成减产15%￣30%,重则绝产。杂草的防除已成为大 In recent years, the main factor that affects the soybean yield in the northern part of Heilongjiang Province is the heavy-stubble crop. According to incomplete statistics, crop area accounted for 75%, accounting for crop area accounted for 15%. Due to the longer stubble cropping season, the single use of herbicide, the weed resistance, or the improper formulation, the weed community in the soybean field evolves and the large area of ​​the vicious weed breeds and spreads, resulting in a 15% ~ 30% decrease in production and a decrease in the production of heavy weeds . Weed control has become large