粮食作物产地
food crops producing areas
甘肃省农业科学院粮食作物研究所
Grain Crop Institute of Gansu Academy of Agricultural Sciences
粮食产量变化
the change of grain output
grain output change
粮食产量预测
grain yield forecast
forecast of grain output
forecasting of grain production
grain output forecast
作物产量差研究与展望
Status and perspective of crop yield gap
作物产量模型
crop yield estimating model