幼树期、结果初期是苹果和梨生命周期的前两个时期。 由数理统计证明:在苹果或梨正常结果的园片,初果时的株产量y与干周X间有显著或极显著地直线正相关;其直线回归方程的一般形式为 y=a+bx (其中a、 b为常数,且a0, b0) 若令y=0,即株产量等于零; 则可推出-x值,把幼树期和结果 Sapling, the initial results of apple and pear life cycle of the first two periods. It is proved by mathematical statistics that there is a significant or extremely significant linear positive correlation between plant yield y and the dry week X in the first round of apple or pear fruit. The general form of the linear regression equation is y = a + bx (Where a, b are constants, and a0, b0) if y = 0, that is, the strain yields zero; then the value of -x can be deduced, the sapling and the results