1972年,我们开始在康平搞耕作改制,期望能在无霜期140～150天的地区实现“一茬变两茬,两茬双高产,粗、细粮齐上”。我们曾用五尺带、六尺带、七尺二带及一丈四尺带等多种形式进行小麦间玉米的试验。结果,各种间种形式均比对照清种玉米增产。其中五尺带、六尺带的产量比七 In 1972, we started to reform farming system in Kangping, hoping to achieve “one stubble and two stubble crops, two stubble double high yield, coarse and fine grain together” in the frost-free period of 140 to 150 days. We used five-footed, six-footed, seven-foot-two and one-footed four-footed bands for testing corn between wheat and wheat. Results, all kinds of inter-species than the control of clear corn yield. One five-foot belt, six-foot belt production than seven