不同包膜控释氮肥对玉米氮素吸收和产量的影响

采用田间试验方法研究施用树脂包膜控释尿素(TSCU)和树脂加硫包膜控释尿素(PSCU)对玉米植株全氮含量、吸氮量、肥料氮素吸收效率、产量以及土壤耕层硝态氮含量的影响。结果表明,TSCU和PSCU处理吸氮量分别达到163.32kg·hm-2和178.54kg·hm-2,比施普通尿素(PU)处理增加26.62kg·hm-2和41.84kg·hm-2,差异达显著水平;玉米产量比PU处理分别提高21.27%和33.36%;TSCU和PSCU处理的玉米氮素吸收效率比PU处理分别增加18.68%和27.47%;在玉米成熟后,控释肥处理耕层土壤硝态氮仍然高于普通尿素处理。在黑土生态条件下,与PU处理的玉米相比,TSCU和PSCU处理均有效提高了玉米的干物质量、吸氮量及产量,减少了环境污染,以PSCU处理控释效果最好。

Effect of Different Controlled-release N Fertilizers on Nitrogen Absorption and Yield of Maize

Field experiment was conducted to investigate the effects of TSCU and PSCU on the total N content,N up-take,N absorption rate,yield of maize plants,as well as soil NO3--N content.The results showed that N up-take at mature maize in TSCU and PSCU treatments were 163.32 kg·hm-2 and 178.54 kg·hm-2 respectively,increased 26.62 kg·hm-2 and 41.84 kg·hm-2 respectively compared with PU treatment,a significant difference was observed between treatments.The yield of maize in TSCU and PSCU treatments increased 21.27% and 33.36% respectively compared with PU treatment.And N absorption rate increased 18.68% and 27.47% respectively.After the maize maturity,soil NO3--N content in controlled-release N fertilizers treatments was still higher than that of PU treatment.Compared with PU treatment of maize that these two kinds of controlled release N fertilizers under the black soil ecological conditions,dry matter weight,N up-take and yield of maize were increased by TSCU and PSCU treatments,the environmental pollution was also reduced.The best controlled-release N fertilizer was PSCU.