尿素添加不同增效剂对夏玉米产量及氮肥利用率的影响

采用大田试验,研究了尿素添加不同增效剂(黄腐酸U17、聚天冬氨酸U24、复合增效剂黄腐酸加聚天冬氨酸组合U20)对夏玉米产量及氮肥利用率的影响。结果表明,施用增效尿素U20、U24和U17分别比普通尿素增产16.0%、8.5%和8.0%,达到显著性差异水平。与施用普通尿素相比,增效尿素U20、U24和U17减量20%时不减产。增效尿素U20、U24和U17能有效提高氮肥利用率,分别比普通尿素提高18.0、10.3和11.5个百分点;减量20%时,氮肥利用率比普通尿素提高18.6、12.7和12.3个百分点,且高于全量时处理。不同增效剂相比,以0.5%黄腐酸+0.3%聚天冬氨酸复合处理(U20)效果最优。

Effects of urea added with different fertilizer synergists on maize yield and nitrogen use efficiency

Field experiments were conducted to investigate effects of urea added with different fertilizer synergists (fulvic acid U17,polyaspartic acid U24,compound fertilizer synergist of fulvic acid and polyaspartic acid U20) on maize yield and nitrogen use efficiency.Results showed that compared with common urea,synergistic urea U20,U24 and U17 increased maize yield by 16.0％,8.5％ and 8.0％ respectively,and the differences arrived at significant level;Maize yield under the treatments of U20,U24,U17 with subtracting 20％ didn't decrease significantly.Compared with common urea,synergistic urea U20,U24 and U17 enhanced nitrogen use efficiency by 18.0,10.3 and 11.5 percentage points respectively.Nitrogen use efficiency under the treatments of U20,U24 and U17 with subtracting 20％ were also increased by 18.6,12.7 and 12.3 percentage points respectively compared to common urea,and were higher than those of the treatments of full amounts.Among three fertilizer synergists,the effects of the treatment of compound fertilizer synergist of fulvic acid and polyaspartic acid (U20) was the best.