1986年,建平县建平镇农业技术推广站在程春泰等4户农民的承包田里搞了20亩玉米覆膜栽培试验,创出了当地玉米高产纪录。一、栽培措施试验田海拔700米,平肥地,有水浇条件。去年终霜期为5月21日,初霜期为9月17日,无霜期仅119天。选用的品种为中单2号,以裸地栽培的“中单2号”及当地 In 1986, Jianping County Agricultural Technology Extension Station in Cheng Chun-tai and other four farmers contracted field engaged in 20 acres of corn film cultivation test, creating a record high yield of local corn. First, cultivation measures Experimental field elevation of 700 meters, flat fertilizer, water conditions. Last year the frost period is May 21, the first frost period is September 17, the frost-free period is only 119 days. The selected varieties are Zhongdan 2, cultivated in the bare “Zhongdan 2” and the local