The linear regression equati on between the seedling height (Y) and the main factor node number (x 2) is y= 1 0.44 + 3.33x 2. The mathematic model of Xinshiji persimmon seedling is Y=-66. 88 + 3.82x 2 - 1.51x 3. R y.

• 柿苗高度 (y)与节间长度 (x1 )、节数 (x2 )和砧木长度 (x3)间的多元线性回归方程 :y =- 66 .；88+2 2