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介绍了一种树脂包膜尿素工厂在线质检的养分速测方法,即,100℃快速浸提对二甲氨基苯甲醛分光光度法,建立了该方法与缓释肥料国家标准(GB/T23348-2009)中规定的25℃静水浸提凯氏定氮法测定结果之间的相关关系,验证了该速测方法预测计算肥料养分释放期的可行性;将控释尿素施用于田间土壤,实时监测土壤的温湿度状况,对比了控释尿素在25℃水与田间土壤中的氮素累积释放趋势。结果表明:(1)100℃浸提对二甲氨基苯甲醛分光光度法可以准确的预测树脂包膜尿素在25℃下的养分释放率和养分释放期。应用此法测定预测样品S1和S2的养分释放期的误差分别只有0.10d和1.75d,相对误差不超过2.3%。(2)控释尿素S1、S3分别在25℃水中与田间耕层土壤(75%相对含水量)中的氮素释放趋势基本一致。25℃静水与耕层土壤的温差(<5℃)较小,不足以引起肥料在两介质中氮素累积释放率的显著差异。
This paper introduces a method for rapid determination of nutrient content in resin-coated urea plant by on-line quality inspection, that is, the rapid extraction of p-dimethylaminobenzaldehyde by spectrophotometry at 100 ℃ has established the national standard of slow release fertilizer (GB / T23348- 2009) in 25 ℃ static Kjeldahl determination of nitrogen determination of the correlation between the results to verify the speed measurement method to predict the feasibility of calculating fertilizer release period; the controlled release urea applied to the field soil, real-time monitoring Soil temperature and humidity conditions, compared with controlled release of urea in water and 25 ℃ soil nitrogen in the cumulative release trends. The results showed that: (1) The extraction of p-dimethylaminobenzaldehyde by spectrophotometry at 100 ℃ could accurately predict the nutrient release rate and nutrient release period of resin-coated urea at 25 ℃. Using this method to predict the release of nutrients S1 and S2 predicted samples of the error of only 0.10d and 1.75d, the relative error does not exceed 2.3%. (2) The release of controlled release urea S1 and S3 was basically consistent with that of nitrogen in field topsoil (75% relative water content) at 25 ℃. The small temperature difference (<5 ℃) between static water and topsoil at 25 ℃ is not enough to cause significant difference of nitrogen release rate between two media.