果树主干截面积计算法,是一种公认的衡量果树生长发育状况及生产效率的基本方法。根据圆周长度和圆面积的基本联系是1:0.07957……,得出公式:主干截面积(Y)=主干周长的平方(X~2)×0.07957,即Y=X~2×0.07957。按照果树栽培和品种资源研究的要求,主干周长在50厘米以下时用Y=X~2×0.8;主干周长在50厘米以上时 Fruit tree trunk cross-sectional area calculation method, is a recognized measure of growth and development of fruit trees and the basic method of production efficiency. According to the basic relationship between the circumferential length and the circular area is 1: 0.07957 ......, the formula is obtained: the main section area (Y) = the square of the trunk circumference (X ~ 2) × 0.07957, that is Y = X ~ 2 × 0.07957. According to the requirements of fruit tree cultivation and variety resources research, when the trunk circumference is below 50cm, Y = X ~ 2 × 0.8; when the trunk circumference is above 50cm