钾肥用量对油菜产量及钾素利用效率的影响

通过11个大田试验研究了钾肥用量对油菜产量、养分含量、养分累积量及钾肥利用效率的影响。结果表明，施钾（K2O）60、120和180kg/hm2与不施钾相比平均籽粒产量分别增加16.8%、21.6%和19.8%，籽粒含钾量增加2.9%、9.1%和7.8%，植株地上部钾素总累积量提高42.9%、63.0%和82.2%。说明施钾能提高油菜籽产量、提高油菜对钾素吸收和累积。油菜钾肥农学利用率、偏生产力、表观利用率和生理利用率均随钾肥用量的增加而显著下降，100kg籽粒需钾量随钾肥用量的增加而增加。综合结果表明，湖北省油菜钾肥高产高效生产的适宜推荐范围为60~120kg K2O/hm2。

Effect of potassium application rate on yield and fertilizer -potassium utilization efficiency in rapeseed

Eleven field experiments were carried out to study the effects of potassium(K) application rate on rapeseed yield,nutrient concentration,nutrient accumulation and fertilizer-K use efficiency in Hubei province during 2007-2008.Compared to no K treatment,the average yield of the treatment with K2O rates 60,120 and 180kg/hm2 increased by 16.9%,21.6% and 19.8%,with average K content increased by 2.7%,9.0% and 7.8%,total K uptake by the aboveground parts of rapeseed average increased by 42.9%,63.0% and 82.2%,res...