短語詞組短語spring wheat maize intercropping system 春小麥玉米帶田Single -harvest spring-maize 春玉米一熟制early spring maize 早春玉米spring maize area 春玉米區(qū)spring maize yield 春玉米産量spring maize field 春玉米田Spring maize seeding 春播玉米plastic covering spring maize 覆膜玉米 返回 spring maize