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我省地处中原,人多地少。玉米是我省主要粮食作物。为了解决小麦与玉米的用地矛盾,提高复种指数,玉米生产由春播改为夏播。耕作制度的改变,使玉米生育期缩短,6～8月底,自然灾害也比较多,杂交制种产量低而不稳,制约着玉米生产的发展。为了解决这个问
The province is located in the Central Plains, many people less. Corn is the main food crop in our province. In order to solve the contradiction between land use of wheat and corn and increase the multiple cropping index, corn production was changed from spring sowing to summer sowing. The change of farming system shortens the growth period of maize. From the 6 to the end of August, there are more natural disasters, and the low and unstable hybrid seed production restricts the development of corn production. In order to solve this question