包膜尿素和普通尿素不同掺混比例对水稻产量与氮肥利用率的影响

Effects of different mixture rates of coated urea and prilled urea on rice grain yield and nitrogen use efficiency

以晚粳稻"秀水110"为供试水稻品种,在2007、2008连续2年田间试验条件下,研究了硫磺加树脂双层包膜尿素(SPCU)和普通尿素(PU)不同掺混比例对水稻产量及氮肥利用率的影响。结果表明,与当地农民习惯施用普通尿素PU100%(N 210 kg/hm2)处理相比,等氮量下一次性基施包膜尿素SPCU100%、SPCU70%+PU30%和SPCU50%+PU50%处理产量为7644.0、7172.5和7008.2 kg/hm2,增产17.75%、10.49%和7.96%;氮肥利用率为27.64%、23.24%和18.06%,提高18.73、14.33和9.15个百分点;氮肥农学效率也有显著增加。

Using japonica Xiushui 110 as the tested rice cultivar,effects of different mixture rates of sulfur-polyester resin-coated urea（SPCU）and prilled urea（PU）on rice grain yield and nitrogen use efficiency（NUE）were studied in fields during 2007 and 2008.Results show that compared to the PU100% at N 210 kg/ha in conventional fertilizer application,the rice grain yields are 7644.0,7172.5 and 7008.2 kg/ha under the single basal application of SPCU100%,SPCU70%＋PU30% and SPCU50%＋PU50% treatments,respectively,which are significantly increased by 17.75%,10.49% and 7.96%,and the nitrogen use efficiencies are 27.64%,23.24% and 18.06%,which are significantly increased by 18.73,14.33 and 9.15 percent point.These results indicate the agronomic nitrogen use efficiencies are significantly increased.