棉花主茎展第5～14叶、15～24叶期的快速扩面叶分别为倒3叶和倒4叶;主茎展第8～17叶时,任一展叶期内倒5叶宽(b)在 N-3≤b≤N-1厘米范围内为长势正常(N 为主茎展叶数);棉花茎枝展叶存在 N-3、N-5、N-7……N-(2n+1)的同伸关系(n 为果枝展叶数)。根据上述同伸关系,即可快速诊断棉花长势,有利于及时采取措施,调节棉花生育。 Cotton main stem exhibition of the first 5 to 14 leaves, 15 to 24 leaf rapid expansion leaves were inverted 3 leaves and inverted 4 leaves; main stem when the first 8 to 17 leaves, any one leaf during the fall 5 leaves wide (b) N-3, N-5, N-7, N-7, N- (2n + 1) is the extension of the relationship (n is the number of branches show leaf). According to the same extensor relationship, you can quickly diagnose the cotton growth, which is conducive to timely measures to regulate cotton growth.