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玉米杂交种子的推广利用使玉米产量大幅度的增长,它的增产效果是世界公认的。玉米杂交种的应用,必须具备两项基本条件,一是杂交优势要强,二是纯度要高。如果纯度较低,特别是自交粒过多,就会抵消杂交种的增产作用,甚至严重减产。近年来,由于应用劣质玉米杂交种给生产造成严重损失的事时有发生。据我们实验考查,玉米杂交种子纯度每降低1%,产量相应减产0.70%～0.84%,其直线回归
The popularization and utilization of maize hybrid seeds have greatly increased the yield of maize, and its yield-increasing effect is universally acknowledged. The application of maize hybrids must have two basic conditions, one is hybrid superiority, the second is higher purity. If the purity is low, especially if there are too many self-inoculum, it will counteract the increase effect of the hybrids and even reduce the yield severely. In recent years, there have been times when production of low quality maize hybrids has been severely damaged. According to our experimental study, each reduction of 1% in the purity of corn hybrid seeds, the yield decreased 0.70% ~ 0.84%, the linear regression