Abstract: The agronomic performance of a newly developed site specific nutrient management (SSNM) technique was tested against the farmer’s fertilizer practice (FFP) in farmer’s rice fields for N fertilizer application to direct seeding early rice at Jinhua City of Zhejiang Province. Results showed that SSNM increased rice yield significantly and improved N use efficiency substantially. The main benefit of SSNM was related to its improved splitting and timing of fertilizer N applications leading to a more balanced supply of N nutrition for rice growth than the common fertilizer practice. When 100 kg/hm² N was applied into plots, recovery N use efficiency was 0.36 and agronomic N use efficiency was 15.24, and grain yield could be over 6 t/hm²

Key words: rice, direct seeding, nitrogen, fertilizer, site specific nutrient management

摘要： 在浙江省金华市对直播早稻优化氮肥施用进行了田间试验研究。试验结果表明，同农民常规的施肥实践相比较，精细养分管理的施肥技术能为水稻整个生育期提供比较平衡的氮素供应，可以显著提高氮肥的利用效率和水稻产量。在施氮量达到100 kg/hm2 时，表观肥料回收率达到0.36，氮肥农业效率达到15.24，同时可获得6 t/hm2的产量。

关键词: 水稻, 直播, 氮素, 肥料, 精细养分管理