氮肥用量对芸豆氮肥利用率和产量影响的研究

以品芸2号、英国红、龙芸6号和龙芸4号为试验材料,研究了氮肥用量对芸豆氮肥利用率及产量的影响,结果表明:四个芸豆品种的产量均在N30处理时最高,由回归拟合方程可知,氮肥用量与产量关系密切。四个品种的最佳施氮量分别为:品芸2号39.01kg/hm2,英国红29.82kg/hm2,龙芸6号33.72kg/hm2,龙芸4号32.15kg/hm2。四个品种芸豆各处理植株的吸氮量随着干物质的积累而增加,处理间的差异则因品种的不同而异。四个品种氮肥吸收利用率均在N30处理最高；而低氮处理有利于芸豆农学利用率的提高；氮肥偏生产力均随着氮肥施用量的增加而降低；品芸2号和英国红的生理利用率N15处理最高,而龙芸6号和龙芸4号两个品种分别在N60和N30处理下达到最高值。

Effect of Nitrogen Application on Nitrogen Use Efficiency and Yield of Kidney Bean

Four varieties, Pinyun 2, British red kidney bean, Longyun 6and Longyun 4were used to study the effect of nitrogen application on nitrogen use efficiency and yield of kidney bean. The conclusions are as follows:the yield under N30treatment of the four varieties has be the largest. Via regression fitted equation it can be calculated that the relation is close between nitrogen fertilizer and yield. The best nitrogen application rates were:39.01kg/hm2,9.82kg/hm2,3.72kg/hm2and 32.15kg/hm2respectively for Pinyun 2, British red kidney bean, Longyun 6, Longyun 4. The nitrogen uptake amount of the four varieties have increased with the accumulation of dry matter, the result of the difference among the treatments is the difference varieties; the nitrogen recovery efficiency of N30was higher than other treatments in the four varieties; but low nitrogen treatment was positive in improving nitrogen agronomic efficiency of kidney bean; with the increase of nitrogen application, nitrogen partial factor productivity has reduced; physiological efficiency of Pinyun 2and British red kidney bean hit the highest at N15, while that of Longyun 6and Longyun 4reached their peaks at N60and N30respectively.