The biggest difference of per plant leaves area was appeared in 22, April, while the per plant leaves area of 3:1 and 4:2 was 1.17 and 1.41 times of that of WFC, respectively.

• 单株叶面积最大差异出现在4月22日前后，此时3:1式和4:2式麦棉套种小麦单株叶面积分别为麦棉轮作的1.；17倍和1