油菜不同部位分枝籽粒生产力对氮肥反应的差异

研究了不同氮肥用量对杂交油菜“秦油2号“主序及各分枝生产力的影响.结果表明, 随着氮肥用量的增加,主序产量占单株产量的比例逐渐降低,施氮量过大则又略有回升.主序籽粒约占产量1/4时,单株产量最高;在不同氮肥用量下,上部分枝生产力的变化趋势类似于主序,而中部分枝则与全株一致;在分枝产量构成因素中,氮肥用量对分枝角果数的影响最大;主序及上位分枝中氮素累积量受氮肥用量的影响程度较小,而中下位分枝则较大.

Different Reactions to Nitrogen Fertilizer of Seed Yields at Different Parts of Rapes

The effects of Nitrogen fertilizer on the yields of main stem and branches of hybrid rape Qingyou No.2 are studied in this paper. Results show that with more fertilizer applied, the proportion of seed yields on the main stem in the total yield decrease gradually but slightly increase when the amount of Nitrogen fertilizer is excessive. The individual plant yield is at maximum when the seed yield of main stem is 1/4 of the total yield. When different amount of Nitrogen fertilizer applied, upper-branch yields change in the similar way as main stem yields and middle-branch yields in the same way as those of the whole plant. Among the branch yield factors, the amount of Nitrogen fertilizer exerts the most effects on the number of branch pods and the least effects on the amount of nitrogen accumulated in main stem and upper-branches, with larger effects on middle and lower branches.