怎样选购优良玉米品种
JILIN NONGYE（2008）
Abstract
<正>1.适区选种所谓适区选种就是坚持安全成熟的原则,一定要选所在区域适合熟期的品种。根据当地的无霜期和有效积温,选择相应熟期的品种。如果采用地膜覆盖技
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