major grain producing area 粮食核心区 ; 粮食主产区
major grain-producing area 粮食主产区
main grain producing area 粮食主产区
There are different factors to impact producing technical efficiency in main grain producing area;
②三种粮食作物的生产技术效率所受影响因素不同；
Henan province is the major grain producing area of China, as well as one of main traditional flower producing areas.
摘要河南省是我国重要的粮食主产省，也是我国重要的花卉传统生产区域之一。
The paper applied the information diffusion model of non-parametric estimation to project the level of productivity risks for cereals, rice, corn and wheat at major grain-producing area.
本文采用非参数估计的信息扩散模型测算了我国粮食主产区水稻、玉米、小麦和棉花产量损失风险水平。
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