【摘要】 在有效钾水平较低的砂质壤土上进行不同钾肥用量及施用方法试验，并测定了油菜植株不同节位分枝的籽粒产量、产量构成因素及籽粒品质。结果表明：①施钾可显著提高油菜籽粒产量，并改变籽粒产量在主花序及分枝间的分配比例；②油菜不同节位分枝生产力对钾肥的反应不同，钾肥主要提高中、下位分枝的生产力，并缩小分枝间生产力的差距，而对主序及上位分枝的生产力作用较小甚至有一定程度的消弱作用；③施钾数主要提高了分枝的角果数，对千粒重作用较小，对每角粒数有一定的负效应；④施钾可明显提高籽粒含油率，对脂肪酸组成影响很小，但有提高芥酸含量的趋势；⑤分期施钾提高分枝生产力的效果优于一次性基施。更多还原

【Abstract】 This experiment was carried out on a sandy loam with low effective K and 5 rates of K fertilizer were applied to investigate the responses of branch productivity and seed quality of rape to K application. The results showed as following: ① K application could increase seed yield and change the yield distribution between main anthotaxy and branches. ② The response of seed productivity of uper branches to K application was different from that of lower branches. K application could enhance seed productivity of middle and lower branches and could shorten the productivity gap among branches as well but had little effect on the productivity of main anthotaxy and uper branches. ③ K application could increase the number of branch pods but had little and negative effect on 1000 seed weight and number of seeds per pod respectively. ④ Increasing the rate of K application enhanced oil content and had little effect on the content of fatty acids but tended to increase the content of erusic acid in this experiment. ⑤ The superior effect of K application at stem elongating stage was observed in this study.更多还原