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投影称重求积法是用于测算各种果树单叶或复叶叶面积的一种方法。它是经我们多年摸索总结后提出的,具有较高的准确性。该方法是将供测的单叶或复叶,按自然大小和形状分别绘在标准图画纸上,也可画在质地、厚薄、重量均匀的硬纸片上,然后将所画的叶面积全部剪下,再从任一剪下的叶面积中剪取一定单位面积称重(W_1/S),并将其他剪下的全部叶面积称重(∑W),最后用公式,叶面积平均值((?))=ΣW/(W_1/S)=∑W×(S/W_1)就可求出叶面积平均值。
Projection weighing quadrature method is used to measure a variety of fruit trees single leaf or leaf area of a method. It is made after many years of exploration and conclusion, with high accuracy. The method is to measure the single leaf or compound leaf, respectively, according to the size and shape of the natural painted on a standard drawing paper, can also be painted on the texture, thickness, weight uniform piece of paper, and then all of the painted leaf area cut (W_1 / S), and weigh all the other leaf areas (ΣW). Finally, using the formula, the average leaf area ( (?)) = ΣW / (W_1 / S) = ΣW × (S / W_1).