控释氮肥对玉米生长发育和产量及其效益的影响

为了探讨控释氮肥施用的最佳用量，在大田条件下，试验设6个处理：T1不施氮肥、T2常规施肥（基施）、T3常规尿素（基施+追施）、T4控释尿素100%、T5控释尿素90%、T6控释尿素80%。研究控释氮肥对玉米生长发育和产量及其效益的影响。结果表明：整个生育期控释氮肥处理提高了玉米株高、地上部干物重，且从拔节到成熟期，控释尿素100%、控释尿素90%处理地上部干物重高于普通尿素处理，且控释尿素90%处理最大。控释氮肥合理用量提高了玉米的茎粗、穗粒数，减少了玉米秃尖长度。控释尿素90%处理产量最高，达到8637.6 kg/hm2，与不施氮肥相比产量提高16.7%，与常规施肥（基施）相比产量提高9.5%，差异达到显著水平。从产量和经济效益分析，控释尿素90%:处理是比较理想的肥料用量选择。

Effects of Controlled Release Nitrogen Fertilizer on Growth and Yield and Benefit of Corn

For the purpose of the application of controlled release nitrogen the best dosage. Under field condition, set six treatments, T1 no fertilizer, T2 conventional fertilization (basal dressing), T3 conventional urea (basal dressing + topdressing), T4 controlled release urea 100%, T5 controlled release urea 90%, T6 controlled release urea 80%. A study on the effects of controlled release nitrogen fertilizer on growth and yield and benefit of corn, the results showed that controlled release nitrogen treatment to improve the corn plant height, the ground of biomass. From jointing to maturity, the dry matter weight of controlled release urea treatment T4, T5 higher than common urea treatment, and the largest T5. Controlled release nitrogen fertilizer reasonable dosage increased corn stem diameter, grain number per panicle, reduce the corn bald tip length, so as to improve production, and the highest yield T5 processing, 8637.6 kg/hm2, and nitrogen production increased by 16.7%, compared with conventional fertilization (basal dressing) production increased by 9.5%, the difference compared to significant level. From the output and economic benefit analysis, T5 processing was an ideal choice fertilizer use.