为了明确施氮水平与大豆产量的关系，确定最佳的施氮水平，通过采用窄行密植的播种模式，设定不同施氮水平的方法，以‘合农60号’为研究对象，研究不同施氮水平对大豆产量构成因子及植株性状的影响，并进行经济效益分析。结果表明：N2P1K1处理的产量最高，为273.4 g/m2，氮肥对株高影响也很明显，N3P1K1处理的株高达到83.4 cm，底荚高度也随之增加，达到36.1 cm，因此，在磷钾肥施用量一定时，在一定范围内多施氮肥有助于产量和经济效益的增加，从产量和经济效益上来分析，本实验N2P1K1为最佳处理。

In order to define the relations between the nitrogen level and soybean production, and determine the best level of nitrogen. By means of narrow row close planing mode and different nitrogen levels, with the ‘Henong60’ as the research object, discussed the influence of different nitrogen levels on the yield factor and plant trait of soybean, and analyzed the economic benefit. The results showed that: the higest yield was 273.4 g/m2 of N2P1K1 treatment, nitrogen was also evident effects on plant height, the highest plant height was 83.4 cm of N3P1K1 treatment. The height of bottom pods also increased at 36.1 cm. Therefore, when the content of phosphate and potash fertilizer were fixed in a certain range, with more nitrogen helped to increase yield and economic benefit. From analysiing production and economic benefit, the experiment N2P1K1 was the best treatment.