Trunk girth growth of the fruit tree was studied by means of Logistic equation Mitscherlich equation . Richards equation with three parameters and four parameters Tricorn function equation and Weibull equation in this paper .

果树干周生长规律常用Logistic方程、Mitscherlich方程、三参数和四参数的Richards方程、 三角函数方程 来 模拟。