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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。叶角和叶向值在紧凑型杂交种和平展型杂交种中表现出一定规律。两种类型的叶角差异和叶向值差异所反映出的结果不同。叶角研究表明，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，创造良好通风透光条件。叶向值则表明紧凑型植株中上部３－６片叶上冲挺直，起到了通风透光作用。与实际测量的透光性相比，叶向值做度量参数较为准确。
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. Leaf angle and leaf value show some rules in compact hybrid and flat hybrid. The difference between the two types of leaf angle difference and the leaf-leaf value difference reflects the difference. Leaf angle study showed that the compact plant upper 1-4 leaves than the flat part of the same site compact compact, to create a good ventilation conditions. The leaf value indicates that the top three to six leaves in the compact plant are upright and play a role of ventilation and light. Compared with the actual measured translucency, the value of leaf orientation is more accurate.