论文部分内容阅读
通过连续 3年 ( 1999～ 2 0 0 0年 )大田试验 ,研究了钙镁磷肥复式包膜尿素对冬小麦产量、氮效率〔包括 :氮素效率比 ( NER) ,氮吸收效率 ( NUp E) ,氮素使用效率 ( NUE)和氮肥利用效率 ( Nf UE)〕的影响。结果表明 ,钙镁磷肥复式包膜尿素与普通尿素的生物量、籽粒和秸秆量均显著大于对照处理 ;氮素使用效率 ( NUE)和氮肥利用率均显著高于对照。包膜尿素处理的产量和氮效率最高 ,其籽粒、秸秆、生物量平均值比普通尿素处理分别高 9.0 9%～15 .0 6 %、13.11%～ 14 .96 %、11.73%～ 14 .99% ,氮肥利用率高 15～ 16个百分点。在本试验条件下 ,相对于通常氮肥施用量 ( 15 0 kg N/hm2 ) ,少量增加氮肥施用量 (氮肥用量增加 8% )对产量和氮效率 ( NE)没有显著影响 ;而大量增加氮肥施用量 (增加 2 0 % ) ,能明显增加小麦产量、吸氮量和氮肥利用率
Through field experiments of three years (1999 ~ 2000), the effects of Ca, Mg, P coating urea on winter wheat yield, N efficiency (including NER, NUpE, Nitrogen Use Efficiency (NUE) and Nitrogen Use Efficiency (Nf UE)]. The results showed that biomass, grain and straw amount of Ca, Mg, P and Co were significantly greater than those of CK. NUE and N use efficiency were significantly higher than those of CK. Coated urea had the highest yield and nitrogen efficiency, and the average values of grain, straw and biomass were 9.09% -15.06%, 13.11% -14.96% and 11.73% -14.99 %, Nitrogen fertilizer utilization rate of 15 to 16 percentage points. Under the experimental conditions, a small increase in N application (8% increase in N application) had no significant effect on yield and nitrogen efficiency (NE) relative to the usual N application (15 0 kg N / hm2) Dosage (20% increase) can significantly increase wheat yield, nitrogen uptake and nitrogen use efficiency