氮肥施用量对菜豆前期产量和土壤碱解氮的影响

通过田间小区试验，研究了氮肥不同用量对露地菜豆前期产量、经济效益以及土壤碱解氮的影响。试验结果表明：随着氮肥用量的增加，菜豆的前期产量和经济效益以纯氮用量为178kg／hm^2时达到最高，分别为8690．48kg／hm^2和32222．00元／hm^2，各处理间差异显著。氮肥用量增加，土壤碱解氮含量增加，二者呈正相关，相关系数为0．8565。过量施用氮肥会降低菜豆的前期产量和效益，菜豆露地栽培的最适宜施氮量是178kg／hm^2。

Effects of Different Application Amount of Nitrogen Fertilizer on Prophase Yield of Phaseolus vulgaris and Soil Available Nitrogen

The field experiment was conducted to study the effects of different application amount of nitrogen fertilizer on the prophase yield of Phaseolus vulgaris, economic benefit and soil available nitrogen. The results showed that the highest prophase yield and economic benefit as 8 690.48 kg/hm2 and 32 222.00 yuan per hectare respectively could be obtained when the nitrogen amount was 178 kg/hm2 , and there were significant differences between different treatments. Soil available nitrogen was positively correlated with the application amount of nitrogen fertilizer, and the correlation coefficient was 0. 8565. Excessive application of nitrogen fertilizer would reduce the prophase yield and economic benefit, so the optimum application amount of nitrogen fertilizer for open cultivation of Phaseolus vulgaris was 178 kg/hm2.