一自1989年以来,在推广麦、玉米、稻的同时,几次提出杂草严重田以玉米、稻代替麦、稻两熟制,受到市、县领导的重视,实践证明这种方法具有很多优越性。第一,麦、稻等连作是麦田草害严重的根源杂草繁殖系数高,草籽生命力强,在土壤中能生存3～5年。同一块田中某种作物长期连作,与之 Since 1989, while promoting wheat, maize and rice, several occasions have proposed that weeds should be seriously harvested from corn fields and rice instead of wheat or rice. These measures have been given priority by municipal and county leaders. Practice has proved that this method has many advantages Superiority. First, continuous cropping of wheat and rice is a serious root cause of weeds in wheat fields. The breeding coefficient of weeds is high, and the seed vigor is strong. It can survive in the soil for 3 to 5 years. The same piece of Tanaka some crops for a long time, with it