沿江稻田氮肥施用经济效益的研究

Study on Nitrogen Fertilizer Application Economic Effect in Rice Field of Riparian Area

以迟熟中粳品种“通育粳1号”为试材，研究了氮肥施用对水稻经济效益的影响。结果表明：在基肥施氮108kg/hm^2（有机肥）情况下，产量在分蘖肥0～108kg／hm^2氮用量范围内，均以穗肥施氮108kg／hm^2处理最高；分蘖肥施氮置81kg／hm^2时，收益明显低于54kg／hm^2的处理；穗肥施氮量162kg／hm^2时的收益明显低于108kg／hm^2的处理；在分蘖肥施氮量≤54kg／hm^2、穗肥施氮量≤108kg／hm^2时边际成本报酬率较高；高产高效施氮方案为施氮量270kg／hm^2，基肥：蘖肥：穗肥氮素配比为40％：20％：40％。

The effects of Nitrogen application amount on economic effect of rice were studied with high quality and mid- season rice variety Tongyujng 1. The results are as follows. As base-fertilizer Nitrogen application 108 kg/hm^2 （organic Nitrogen）, tiller-fertilizer Nitrogen application in （0 108） kg/hm^2, the yield is most high while the ear-fertilizer Nitrogen application at 108 kg/hm^2; The planting effect at tiller-fertilizer Nitrogen application in 81 kg/hm^2 is less than at tiller-fertilizer Nitrogen application in 54 kg/hm^2, the planting effect at ear-fertilizer Nitrogen application in 162 kg/hm^2 is less than at ear-fertilizer Nitrogen application in 108 kg/hm^2 ;The marginal benefit- cost ratio is more high while tiller-fertilizer Nitrogen application≤54 kg/hm^2 and ear-fertilizer Nitrogen application≤108 kg/hm^2 ; The rice yield and the planting effect are the most high at Nitrogen application amount 270 kg/hm^2 and base-promoting： tiller-promoting： ear-promoting are 40 % ：20 % ： 40%.