控释氮肥对土壤硝态氮和玉米植株全氮含量及产量的影响

为了探讨控释氮肥施用的最佳用量比例，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%。研究控释氮肥对土壤硝态氮和玉米植株全氮及产量的影响。结果表明：土壤硝态氮和秸秆全氮含量随着生育期的推进呈下降趋势，且拔节期含量最高。控释氮肥处理灌浆期到成熟期不同氮素含量高于常规施肥处理。控释氮肥处理提高了玉米不同生育时期的地上部干物重，而从拔节期到成熟期，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，但对百粒重影响不大。控释尿素90%处理产量最高，达到8637.6 kg/hm2，与不施氮肥和常规施肥相比差异达到显著水平。

Effects of Controlled Release Nitrogen Fertilizer on Soil Nitrate Nitrogen and Plant Total Nitrogen Contentand Yield of Corn

For the purpose of the application of controlled release nitrogen the best dosage. Under field condition, set six treatments, T1 no N 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 soil nitrate nitrogen and plant total nitrogen content and yield of corn, Results show that the soil nitrate nitrogen and total nitrogen content of the straw with the development of growth period is on the decline, the highest content and jointing stage. Controlled release nitrogen fertilizer processing various nitrogen filling stage to maturity levels than conventional fertilization treatment. Controlled release nitrogen fertilizer treatment improved the corn aboveground dry matter weight of different growth period, and from jointing stage to mature stage, controlled release urea 100%, controlled release urea 90% treatment of aboveground dry matter weight is higher than common urea, and controlled release of urea 90% is the largest. Reasonable controlled release nitrogen fertilizer dosage increased stem diameter of corn and grain numbers per spike, reduce bald tip length of corn. But the hundred grain weight had little change. Controlled release urea 90% with the highest yield, 8637.6 kg/hm2, and nitrogen reached significant difference compared with conventional fertilization level.