我场位于甘肃灵武,北纬38°10′、东经106°30′,海拔1,117.1公尺,无霜期144天,绝对无霜期119天,土质一般为砂壤土,为一年一熟地区。作物以春小麦和水稻为主,引用黄河的水灌溉。在这生长季节短的地区,当地农民有麦豆间作和麦糜复作等习惯。麦糜复作一般为土地肥沃,连年旱作的田地;麦豆间作即为地力较差的水旱轮作田,于小麦灌第一次水前播种苜蓿,并套种大豆,当年收获麦 My field is located in Lingwu, Gansu, latitude 38 ° 10 ’north, longitude 106 ° 30’, elevation 1,117.1 meters, frost-free period 144 days, the absolute frost-free period of 119 days, the soil is generally sandy loam, a year-cooked area. Crops mainly spring wheat and rice, citing the Yellow River water irrigation. In this short growing season, local farmers have the habit of rehmannia intercropping and rehmannia. Microtus for the general fertile land, dry land in successive years; wheat intercropping that poor soil and water for crop rotation, irrigation in wheat irrigation before the first sowing alfalfa, and intercropping soybean, then harvest wheat