根据硝态氮(硝酸盐氮和亚硝酸盐氮)在紫外区具有强烈吸收的特征,采用国产751G型紫外分光光度计对吉安市红土壤中的硝态氮含量进行测定。经过对500份不同地点种植农作物的土样进行测定分析,结果表明,此法相对其他方法具有操作简便、测定范围宽、干扰因素少、精密度和准确度高等优点。 According to the strong absorption of nitrate nitrogen (nitrate nitrogen and nitrite nitrogen) in the ultraviolet region, the domestic 751G ultraviolet spectrophotometer was used to determine the nitrate nitrogen content in the red soil of Ji’an City. The results showed that this method has the advantages of simple operation, wide range of measurement, fewer interference factors, higher precision and accuracy compared with other methods after the soil samples from 500 crops grown in different locations were measured and analyzed.