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缓释肥料国家标准(GB/T23348-2009)中规定用25℃静水浸提凯氏定氮法测定肥料氮素释放率;但该法浸提的周期较长,且相对繁琐耗时。提出100℃快速浸提和用对二甲氨基苯甲醛分光光度法测氮,分别用该法与25℃静水浸提凯氏定氮法测定了2种典型树脂包膜尿素的氮素释放率,结果表明,两种方法测定结果之间的相关性极显著,R2分别达1和0.9997。100℃浸提用对二甲氨基苯甲醛分光光度法可以准确地预测树脂包膜尿素25℃浸提凯氏定氮法测氮的养分释放率和养分释放期。
The national standard of slow-release fertilizer (GB / T23348-2009) stipulates that the nitrogen release rate of fertilizer is determined by Kjeldahl method at 25 ° C. However, the leaching period of this method is relatively long and time-consuming. The rapid extraction at 100 ℃ and the spectrophotometric determination of nitrogen with p-dimethylaminobenzaldehyde were used to determine the nitrogen release rate of two typical resin-coated urea by this method and Kjeldahl method at 25 ℃. The results showed that the correlation between the two methods was very significant, R2 were 1 and 0.9997.100 ℃, respectively. The extraction of p-dimethylaminobenzaldehyde by spectrophotometry can accurately predict the resin-coated urea extraction at 25 ℃ Determination of nitrogen release rate and nutrient releasing period by nitrogen fixation method.