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高粱叶角和叶向值都是度量植株叶片紧凑上冲程度的参数，叶角是一级参数，叶向值是综合了３个影响叶片空间姿态和分布因素的二级参数。两者在紧凑型杂交种和平展型杂交种中表现出一定规律，但反映结果不同，叶角反映紧凑型植株的上部１～４片叶比平展型相同部位叶片上冲紧凑。叶向值反映紧凑型植株中上部３～６片叶上冲挺直。与实际测量的透光性相比，叶向值更能准确地反映叶片上挺程度。
Leaf angle and leaf value of sorghum were both the parameters to measure the compactness of plant leaves. The leaf angle was the first-order parameter, and the leaf-direction value was a combination of three second-order parameters that affected the leaf space attitude and distribution. Both of them showed some rules in hybrids and flat hybrids, but the results showed different results. Leaf angle reflected that the upper 1 ~ 4 leaves of the compact plant were compact on the leaves of the same type. Leaf value reflects the compact plant in the upper 3 to 6 leaves rushed upright. Compared with the actual measured translucency, the value of leaf can more accurately reflect the degree of upright leaves.