氮肥用量和运筹方式对机插早稻产量的影响

Effects of Nitrogen Fertilizer Dosage and Application Mode on Yield of Mechanically-transplanted Early Rice

田间试验结果表明，施氮量在0—225kg／hm^2的范围内，机插早稻的单位面积产量与施氮量呈二次函数关系，其关系式为Y=-0．0742x^2＋28．979x＋4068．3，即当施氮量为195．3kg／hm^2时，单位面积产量最高。与习惯施肥方法（基肥：蘖肥：穗肥=7：3：0）相比，适当增加分蘖肥的施用比例，有利于机插早稻产量的提高，在大田总施氮量为180kg／hm^2的条件下，施用比例以基肥：分蘖肥：穗肥为4：5：1或5：4：1的运筹方式为佳。。

The result of field experiment showed that the unit area yield （y） appeared a quadratic curve relation （y = -0.0742x^2 ＋ 28. 979x ＋4068.3） with the application rate of nitrogen fertilizer （x） in the range of 0 - 225 kg/hm^2 for mechanically- transplanted early rice. There was the highest unit area yield when the application rate of nitrogen fertilizer was 195.3 kg/hm^2. Compared with the traditional nitrogen fertilizer application mode （ basal fertilizer： tillering fertilizer： earing fertilizer = 7： 3： 0）, properly increasing the proportion of tillering fertilizer could enhance the yield of mechanically - transplanted early rice. Under the condition of applying 180 kg/hm^2 nitrogen fertilizer, the better application mode of nitrogen fertilizer was basal fertilizer： tillering fertilizer： earing fertilizer =4：5 ： 1 or basal fertilizer： tillering fertilizer： earing fertilizer = 5：4： 1.