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选用４因子５水平（全实施）二次回归通用旋转组合设计，采用人工打孔去叶模拟秋甘蓝不同生育期复合受害对产量损失的综合反应。组建模型的主效应分析表明，秋甘蓝在生长前期（苗期—莲座期—团棵期）随着叶片受害损失的增加，产量损失率随之上升。在生长后期（结球初期—叶球膨大期）叶片受害对产量的影响相对较小，秋甘蓝表现出一定的产量损失补偿能力。各生育期交互效应分析表明，移栽后３０天（苗期—莲座期）叶片受害是一个主要因子。模型的边际效应分析表明，在各生育期单独受害时，以移栽后６０天和９０天（相当于四棵期和结球初期）产量增减对叶片受害水平十分敏感，而在移栽后３０天和１２０天（相当于苗期至莲座期和对球膨大期），存在着产量损失补偿平衡点值，该值分别为平均每株叶片损失９７．４８ｃｍ２和７６．４９ｃｍ２。
The quadratic regression general rotation combination design with 4 factors and 5 levels (full implementation) was adopted, and artificial punching and defoliation were used to simulate the comprehensive response of yield damage caused by compound damage of different growth stages of autumn cabbage. The main effect of the model was analyzed. The yield loss rate of autumn cabbage increased with the loss of leaf damage in early growth period (seedling stage - rosette stage - boll stage). In the late growth stage (the early stage of the ball-swelling stage), the impact of leaf damage on yield was relatively small, and the yield loss compensation ability of autumn cabbage was certain. The interaction effects at different growth stages showed that the leaf damage at 30 days after transplanting (seedling-rosette stage) was a major factor. The marginal effects of the model showed that the yield of leaves at 60 days and 90 days after transplanting (corresponding to the four-stage and early stage of heading) was very sensitive to the level of leaf damage when they were individually harmed at each growth stage. However, At 30 days and 120 days (equivalent to seedling to rosette and balloon bulging), there is a point of yield loss compensation that is, on average, 97.48 cm 2 and 76.49 cm 2 loss per leaf respectively.