利用油研 7号 ,进行三元二次正交旋转组合试验 ,研究了密度、施氮量、施钾量对甘蓝型杂交油菜单株一、二次分枝抽生概率的影响 ,结果表明 :三因素对单株一次分枝抽生概率影响大小的顺序为密度 >施氮量 >施钾量。 3因素对一、二次分枝抽生概率的影响达到极显著和显著水平。不同抽生概率的一次分枝均可产生二次分枝 ,高抽生概率的一次分枝产生高概率的二次分枝。单株一次分枝总的抽生概率与单株干物重间呈极显著正相关 ,二次分枝总的抽生概率、平均抽生概率与单株干物重间均呈极显著正相关。群体中一次分枝总数与单株一次分枝总的抽生概率间呈极显著负相关。群体中二次分枝总数与二次分枝总的抽生概率、平均抽生概率间均呈极显著正相关。 The experiment of combination of Yanyan 7 with quadratic quadratic orthogonal rotation was conducted to study the effect of density, nitrogen application rate and potassium application rate on the probability of first and second tap of single-cropped rapeseed hybrids. The results showed that: The order of the three factors influencing the probability of single tap of single plant is the density> nitrogen application rate> potassium application rate. The influence of three factors on the probability of first-degree and second-degree tap-offs reached extremely significant and significant level. A branch with different probability of spawning can produce a second branch, and a branch with a high probability of drawing can produce a second branch with a high probability. There was a significant positive correlation between the total probability of single plant branch extraction and single plant dry matter weight. The total secondary plant extraction probability and average pumping probability were significantly and positively correlated with single plant dry matter weight. There was a significant negative correlation between the total number of primary branches in a population and the total probability of a single branch in a single plant. There was a significant positive correlation between the total number of secondary branches and the total probability of secondary branch extraction and the average probability of secondary aspiration.