控释尿素对稻田氮素影响及其增产效应

Influence of Coated Controlled Release Urea on Nitrogen of Rice Yield and Its Increasing Yield Effects

探讨了包膜控释尿素和尿素对水稻的增产效果。结果表明：施用包膜控释尿素可降低稻田土壤和水层中硝态氮与铵态氮含量;在水稻生育前期,植株的含氮量与等氮量尿素处理相比,未表现出明显的差异;到灌浆初期,植株的含氮量则显著高于等氮量尿素处理,较等氮量处理分别高出44.09%和17.84%,其氮素利用率可达37.8%-64.4%,比尿素处理提高了17.9%-19.1%;即使在氮素用量减半时,依然可获得较高产量。包膜控释肥对水稻的增产效应主要是增加了有效穗数。施用包膜控释尿素增加了水稻的经济效益。

Field experiment was conducted at Yuhuatai District, Nanjing. The effects of coated controlled release Nitrogen on rice yield was tested compared with the urea. Results indicated that： Application of controlled release fertilizers can reduce the nitrate nitrogen and ammonium nitrogen;The nitrogen content in plant does not show obvious difference by different treatments at rice elongation and panicle initiation stage, but it is obviously increased by 44.09 % and 17.84 % compared with equal nitrogen treatments in beginning period of watery stage. Farmers can obtain higher yields even if they apply a half of usual dosages because of the utility efficiency up to 37.8 % - 64.4 %, increased by 17.9% - 19.1% compared with urea; Sealed fertilizers can apparently increase the available fringes of rice and economic efficiency.