控释氮肥对稻油产量及氮肥利用的影响

Effects of different mixture ratios of polyester resin-coated urea to pilled urea on yield and nitrogen efficiency under rice-rape rotation

在2009—2011年连续3年4季田间试验条件下，研究树脂包膜尿素和普通尿素不同掺混比例对水稻．油菜轮作系统中的作物产量和氮肥利用率的影响。结果表明，与当地农民习惯施用普通尿素处理（N180kg·hm-2）相比，等氮量下控释氮肥与普通尿素用量为7：3的控释氮肥处理水稻和油菜增产效果最好，平均产量分别为9934和2117kg·hm-2，增产7．00％和17．03％；控释氮肥处理水稻和油莱的氮肥吸收利用率平均分别增加9．76—25．84和3．85～10．67个百分点，氮肥农学利用率和偏生产力也有显著增加。

The effects of different mixture ratios of polyester resin-coated urea （PCU） to prilled urea （PU） on yield and nitrogen （N） efficiency under rice-rape rotation was investigated via field experiments during 2009 - 2011. The results showed that compared to the treatments of PU at the N application rate of 180 kg·hm-2 as conventional management practices for local famers, the average yields of rice and rape were 9 934 and 2 117 kg.hm-2 under the treatment of PCU mixed with PU （PCU： PU, 126：54 kg.hm-2）, which significantly increased by 7.00% and 17.03%, respectively. The application of PCU significantly increased N uptake efficiency for rice and rape by 9.76%-25.84% and 3.85%-10.67%, respectively, as compared to the conventional practices. These results indi- cated the N agronomy efficiency and N partial factor productivity were significantly improved with the mixed application of PCU.