玉米产量90％以上是光合作用的产物,叶片是主要同化器官,叶面积大小是产量高低的决定因子,是玉米生产和科研工作中的一个重要计量指标。叶面积的计算公式为: S=KLB 式中S为叶片面积,K为叶形系数,L为叶片长度,B为叶片最大宽度。玉米叶片的长度和最大宽度可以直接测定。因此,叶片面积计算的关键在于正确地确定K值。叶片面积计算中,国外K值取0.75,我国以往一般用0.70,近年也有用 More than 90% of the yield of maize is the product of photosynthesis. The leaf is the main assimilating organ. The leaf area size is the decisive factor of the yield. It is an important measurement index in the corn production and scientific research. The leaf area is calculated as: S = KLB where S is the leaf area, K is the leaf shape coefficient, L is the leaf length, and B is the maximum leaf width. Maize leaf length and maximum width can be directly measured. Therefore, the key to the blade area calculation is to correctly determine the K value. Leaf area calculation, the foreign K value of 0.75, China in the past generally used 0.70, also useful in recent years