春小麦茬复种技术王盼忠，徐惠云，孙振山西省农科院高寒作物所大同０３７００４北方春麦区终霜期一般在５月上旬，初霜期在９月中、下旬。春小麦在３月下旬至４月上旬播种，７月中旬收获。由于春麦苗期耐寒，生育前期所需的生物学下限温度比大田作物低，生育期比大田作物... Spring wheat stubble cropping technology Wang Panzhong, Xu Huiyun, Sun Zhen Shanxi Academy of Agricultural Sciences alpine crop Datong 037004 Spring season in the northern spring generally in early May frost, the first frost period in September mid-to late. Spring wheat is sown in late March to early April and harvested in mid-July. Due to the cold-resistant spring wheat seedling stage, the minimum biological temperature required during early growth period is lower than that of field crops and the growth period is more than that of field crops.