【摘要】 以常规尿素为对照,研究了控释尿素用量与施用方式对玉米氮素利用和产量的影响。结果表明,随着施氮量的增加,玉米叶面积指数、干物质积累量、籽粒产量及籽粒蛋白质含量和产量均显著增加。施氮水平相同时,玉米氮肥利用率、产量和品质均表现为:控释尿素底施>控释尿素侧施>常规尿素侧施。与控释尿素侧施相比,底施分别使籽粒产量、籽粒蛋白产量和氮肥利用率提高4.8%~7.7%、5.6%~8.2%和13.9%~28.3%,均达显著水平。综合分析表明,与常规尿素和控释尿素侧施相比,底施包膜控释尿素150 kg N/hm2能够显著提高玉米氮肥利用率,提高其产量和品质。更多还原

【Abstract】 With normal urea as control,the experiment was carried out to study the effects of the application rate and method of controlled-release urea on the N utilization and yield of maize.The results showed that,with the increase of N rate,leaf area index,dry matter accumulation,grain yield,grain protein content and yield of maize increased significantly.At the same N level,the nitrogen use efficiency,yield and quality of maize showed bottom application of controlled-release urea> side dressing of controlled-release urea>side dressing of normal urea.Compared with side dressing,the bottom application of controlled-release urea significantly increased the grain yield by 4.8%～7.7%,grain protein yield by 5.6%～8.2%,the N use efficiency by 13.90%～28.3%.In conclusion,bottom application of controlled-release urea 150 kgN/hm2 could increase the N use efficiency significantly,the yield and quality of maize.更多还原