不论春播和夏播玉米都有小苗小株发生。这个一般不被人们注意的问题,却是造成玉米减产的重要原因之一。1982年我们对两当县8个公社160个承包户的671.9亩玉米进行了调查。川坝平地和梯田小株一般占5.6～48.3％, Whether spring or summer sowing have small seedlings occur. This is generally not the issue of attention, but it is one of the important reasons for the reduction of corn production. In 1982 we investigated 671.9 acres of corn from 160 contractors in 8 communes in Liangdang County. Chuanba plain and terraced plants generally account for 5.6 ~ 48.3%