小麦-夏玉米
Wheat-summar co rn cropping
早熟夏玉米
Early-maturing summer maize
冬小麦-夏玉米
winter wheat-summer corn
winter wheat-summer maize system
Winter
冀鲁豫夏玉米区
Hebei-Shandong-Henan summer corn planting zone
冬小麦-夏玉米轮作
rotation of winter wheat and summer corn
winter wheat-summer maize rotation
Wheat-maize rotation system
冬小麦—夏玉米轮作
Winter wheat-summer corn rotation
rotation of winter wheat and summer corn
冬小麦/夏玉米轮作田
winter wheat-summer maize rotation system
夏玉米—冬小麦轮作制
summer maize-winter wheat rotation system
冬小麦－夏玉米轮作体系
winter wheat-summer maize rotation system
特早熟夏玉米
Especial-early summer corn
Especial － early summer com
夏玉米肥料定位试验
fixed-site field experiment
稻田套播
Interplanting wheat in paddy
棉林套播
sowing rapeseed in cottonfields