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近年来,我国玉米种植面积不断扩大,单交种覆盖率比率增大,单产不断提高,许多地方普通玉米供大于求,价格下跌,农民种植玉米效益下降,甚至亏本,大大挫伤了农民的积极性。怎样才能做到既保持普通玉米的优势,又解决普通玉米种植效益差的矛盾,优化种植业结构,使玉米
In recent years, the area under maize cultivation in our country has been continuously expanding. The coverage rate of single species has been increased and the yield per unit has been continuously raised. In many places, the supply of ordinary maize has exceeded the demand, the price has dropped, and the efficiency of peasants planting corn has dropped or even been lost. This has greatly dampen the enthusiasm of peasants. How can we not only maintain the advantages of ordinary maize, but also solve the contradiction between the poor efficiency of ordinary maize planting and optimize the planting structure so that corn