Fast measurement of nutrient release rate of coated controlled-release fertilizers
Fast measurement of nutrient release rate of coated controlled-release fertilizers
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发表时间：
2007
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通讯作者：
Geng Yuqing
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作者：
Geng Yuqing
包膜控释肥养分释放速率的快速提取测定是质量检测和标准制定的关键。利用快速提取测定方法可以在短时间内估计或评价包膜控释肥的养分释放速率和释放寿命。在25℃的水中测定了4种包膜控释肥的养分释放寿命，并与100℃的快速提取和化学测定结果进行了比较。建立了相同养分释放速率下包膜控释肥的释放时间的拟合方程。结果表明，4种包膜控释肥在相同的养分释放速率下的释放时间方程具有显著的关联性。采用100℃快速提取法可在短时间内准确地测定包膜控释肥的养分释放速率。采用100℃快速提取测定法，可在1048小时内估算出36个月的包膜控释肥的释放寿命。结果表明，用电导法测定包膜控释肥在100℃下的快速提取液，可在1048小时内准确测定包膜控释肥的释放时间。在25℃下测定6个月释放寿命的最大预测误差仅为10天(5.6%)，100℃电导法也可用于测定包膜控释肥的养分释放速率，该方法比100℃下的化学测定法更方便，25℃下测定6个月释放寿命的最大预测误差仅为15天(8.3%)。
The fast extraction measurement of nutrient release rate of coated controlled-release fertilizer was the key for quality determination and criterion establishment.The nutrient release rate and release longevity could be estimated or evaluated in short period of time by using fast extraction measurement method.The nutrient release longevity of four kinds of coated controlled-release fertilizers was mensurated in water at 25℃,and the results matched the results of the fast extraction and chemical measurement at 100℃.The fitted equations of release time of coated controlled-release fertilizers at the same nutrient release rate were established,validated and evaluated.The fast extracted solution of coated controlled-release fertilizers at 100℃ could be mensurated by using electrical conductivity method(convenient measurement method).The results indicated that the fitted equations of release time of four kinds of coated controlled-release fertilizers at the same nutrient release rate were significantly correlated.The nutrient release rate of coated controlled-release fertilizers could be mensurated accurately in short period of time by the fast extraction measurement at 100℃.By using fast extraction measurement method at 100℃,the release longevity of 36 months of coated controlled-release fertilizers could be estimaed in 1048 hours,and the maximum forecasting error was only 10 days(5.6%) for mensurating 6 months of release longevity at 25℃.The electrical conductivity measurement method at 100℃ could also be used for mensurating the nutrient release rate of coated controlled-release fertilizers.This method was more convenient compared with the chemical measurement at 100℃,and the maximum forecasting error was only 15 days(8.3%) for mensurating the release longevity of 6 months of coated controlled-release fertilizers at 25℃.