水稻减氮高产栽培技术研究

Study on Nitrogen-saving and High-yielding Cultivating Techniques for Rice

2005年在洞庭湖区采用4种不同施氮量水平并以不同基追肥比例进行了水稻减氮施肥试验。结果表明，在基追肥比例4：6条件下，中等施氮量165kg／hm^2的产量最高为6650kg／hm^2，而以135kg／hm^2施氮量处理的产投比最高，达15．70。因此在水稻生产中氮素施用量以135～165kg／hm^2，基追肥比以4：6可以获得较高的产投比，达到减氮高产的目的。

Rice fertilization experiment was conducted with four N application rates and two proportions of basal N to top dressing N in Dongtlng Lake area in 2005-2006. The results showed that under condition of proportion of basal N-top dressing N 4 t 6, yield of N 165 kg/hm^2treatment was highest （6 650 kg/hm^2）, and the ratio of output to input of N 135 kg/hm^2 treatment was highest （15.70）. So N application rate of N 135-165 kg/hm^2 and proportion of basal N to top dressing N of 4 = 6 could reach to higher ratio of output to input, and achieve the purpose of nitrogen saving and high yield consequently.