测定叶面积的方法有:称重法、方格法,面积折算系数法和重量折算系数法。其中以面积折算系数法较为简便,尤其适于田间测定,但仍需经田间测量和室内计算两个步骤。本文介绍一种可省略室内计算的方法,在田间一次测得叶面积,而且保留叶面积折算系数法的全部优点,称“简化系数法”。具体做法:根据叶面积折算系数法,取一片叶,量叶基部到叶尖的长度,再量中部的宽度,二者乘积为 A;再用求积仪或称重法测得该叶面的实际面积 B;求出100片叶的 B/A 的平均值K,即为折算系数。叶面积=长×宽×K。一般作物的 K 值是较固定的,如水稻小麦为0.83,玉米为0.75。一定的叶长和 Methods for determining leaf area are: weighing method, square method, area conversion coefficient method and weight conversion coefficient method. The area conversion coefficient method is relatively simple, especially suitable for field measurement, but still subject to field measurement and indoor calculation of two steps. This article describes a method that eliminates the need for in-house computations, measures leaf area once in the field, and retains all the benefits of the leaf area conversion factor method, called the Reduced Coefficient Method. Specific approach: According to the leaf area conversion coefficient method, take a leaf, the leaf base to the tip of the length of the tip, and then measure the width of the middle, the product of the two A; and then by the sigma or the weight of the measured leaves The actual area B; find the average of 100 leaf B / A K, is the conversion factor. Leaf area = length × width × K. The K value of the general crop is more fixed, such as rice and wheat is 0.83, 0.75 for corn. Certain leaf length and