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

摘要: 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。

Abstract: 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.