The comparative advantage of maize production in Jilin province was analyzed based on the sow area index, unit yield index, benefit index and comprehensive comparative advantage index in this study.
从播种面积指数、单产指数、效益指数以及综合比较优势指数的角度分析了吉林省玉米生产的比较优势。
Mechanized maize harvest is the Achilles heel in the completely mechanized maize production and it a major researched area in China's agricultural mechanization.
玉米收获机械化是玉米全程机械化的薄弱环节，也是目前我国农业机械化的主攻方向，各地正在积极采取措施以提高玉米机械化水平。
The production effects and action mechanism of applied EM biological-organic fertilizer to winter-wheat and summer-maize under the typical cropping systems of the Huabei area in china were analyzed.
本实验是在十年研究的基础上，在华北地区小麦—玉米典型耕作制度下，对土壤长期施用EM生物有机肥，研究其对冬小麦和夏玉米的生产效果与作用机理。
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