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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。
In order to investigate the optimum amount of nitrogen for hybrid japonica rice “Zheyou12”, field experiments were conducted to study the effects of different nitrogen levels on rice yield and nitrogen utilization rate in Huang Miantian of Zhebiang Plain. The results showed that the yield of rice, PEN and REN of rice were the highest with the nitrogen application rate of 210 kg / hm2, increased by 54.4%, 34.1 kg / kg and 58.6% respectively compared with those without nitrogen fertilizer. Compared with the no nitrogen fertilizer application area, the application of proper amount of organic manure on the basis of application of N 150 kg / hm2 could increase nitrogen utilization rate and yield, increase the PEN and REN by 33.1 g / g and 50.6%, and increase rice yield by 61.2% . Under the conditions of this experiment, three factors of rice yield, ecological effect and economic benefit were integrated. The reasonable N application rate was N 234.8 ~ 241.0 kg / hm2 and the corresponding economic yield was 9796.4 ~ 9801.9 kg / hm2.