施氮水平对杂交晚粳“浙优12”产量及氮素利用效率的影响

为探讨杂交粳稻"浙优12"最佳施氮量,采用田间试验研究了不同施氮水平对浙北平原黄松田水稻产量和氮素利用率的影响。结果表明,水稻产量、氮肥生理效率(PEN)、氮肥回收率(REN)均以施氮量210 kg/hm2处理最高,分别比无氮肥区提高了54.4%、34.1 kg/kg和58.6%;与无氮肥区相比,在施N 150 kg/hm2基础上,配施适量有机肥有助于提高氮素利用率和产量,其PEN和REN分别提高33.1 g/g和50.6%,水稻增产61.2%。本试验条件下,综合稻谷产量、生态效应和经济效益三项因素,合理的水稻施氮量为N 234.8～241.0 kg/hm2,相应的经济生态产量为9796.4～9801.9 kg/hm2。

Effects of nitrogen fertilization on yield and nitrogen use efficiency of hybrid rice

The effects of different nitrogen applied levels on rice yield and nitrogen utilization were studied in fields of north of Zhejiang Province in order to get the optimal nitrogen application amount. The rice cultivar is hybrid “Zheyou 12”, and the soil is marine fluvigenic yellow loamy paddy soil. The results show that yield, nitrogen physiological efficiency(PEN)and recovery efficiency(REN)of rice are at their highest levels under the nitrogen application rate of N 210 kg/ha, and compared with the treatment without nitrogen fertilization, the yield, PEN and REN are increased by 54.4%, 34.1 kg/kg and 58.6%, respectively. The nitrogen use efficiency and rice yield are increased under the combined application of organic fertilizer and the nitrogen fertilizer at N 150 kg/ha, and compared with the treatment without nitrogen fertilization, the PEN, REN and yield are increased by 33.1 g/g, 50.6% and 61.2%, respectively. In the ecological conditions for the experiment, integrating three factors of rice production, ecological effects and economic benefits, the reasonable amounts of nitrogen application on rice are in the range of N 234.8-241.0 kg/ha, and the corresponding economic and ecological yields are in the range of 9796.4-9801.9 kg/ha.