８０年代曾有专家认为黄河流域麦后直播棉没有霜前花。进入９０年代，经过农业科技人员的潜心研究和多年试验示范，北纬３８度以南黄河以北地区麦棉纯作两熟，小麦稳产６０００ｋｇ·ｈｍ－２，皮棉９００ｋｇ·ｈｍ－２，霜前花率８５％以上的种植模式已获成功，并进入大... In the 1980s, some experts thought that live broadcast of wheat in the Yellow River valley did not have frost before flowering. Into the 90’s, after agricultural science and technology personnel painstaking research and years of experimental demonstration north of 38 degrees north latitude north of the Yellow River wheat pure cotton two crops, stable wheat yield 6000kg · hm-2, lint 900kg · hm-2, Frost Flower More than 85% of the planting patterns have been successful, and into the big ...