山西省中部平川,包括晋中、吕梁、忻县及晋东南地区,年平均气温9—10℃,无霜期140—160天,大于10℃活动积温为3,700℃左右,热量资源,一年一作有余,两年不足。七十年代以来,在水肥土等生产条件较好的地方,发展麦秋套种中茬玉米,收到较好成效。目前中茬玉米占地30—40％,其产量则占全年亩产的50—70％。所以,狠抓中茬玉米对夺取全年高产具有重要意义。 Shanxi Province, central Hirakawa, including Jinzhong, Luliang, Xin County and southeastern Shanxi, the annual average temperature of 9-10 ℃, frost-free period 140-160 days, greater than 10 ℃ active accumulated temperature of about 3,700 ℃, heat resources, more than a year, Insufficient for two years. Since the seventies, in areas with better production conditions, such as water, fertilizer and soil, the development of wheat under wheat intercropping system has received good results. At present, stubble corn covers 30-40%, while its output accounts for 50-70% of the annual output. Therefore, paying close attention to stubble corn is of great significance in seizing the annual high yield.