叶面积系数是衡量作物长势和密度是否合理的一个重要指标。测量棉花叶面积的方法主要有:求积仪和网点板法、称重法、叶面积仪法和长宽系数法等。这些方法都要求逐叶测量,很费时间。前三种方法要将叶采下,长宽系数法虽然可以在田间活体植株上直接量出叶片的长和宽,但测定的数据不够精确,并且要求每个品种求算一个校正系数。 Leaf area coefficient is a measure of crop growth and density is an important indicator of whether the reasonable. The main methods of measuring cotton leaf area are: plot plotter and dotted plate method, weighing method, leaf area meter method and the length and width coefficient method. These methods require leaf-by-leaf measurements that take a long time. The first three methods are to harvest the leaves. Although the length-width coefficient method can directly measure the length and breadth of the leaves on live plants in the field, the measured data are not accurate enough and a correction coefficient is required for each variety.