桐油包膜尿素养分释放机理的研究

Study on the characteristics of nutrient releasing of the coated urea with tung oil as controlling materials

摘要: 以桐油为包膜材料，采用土壤盆栽试验和水中静置试验，对控释肥料养分释放动态进行了研究。结果表明，以桐油为包膜材料的包膜尿素，在土壤中养分初期溶出率为12.6%，在水中养分初期溶出率为20.1%，是比较理想的包膜材料。在水中与土壤中养分释放期为1:1.2；N素的释放可用LOGISTIC动力学方程描述，释放常数k值可用来判断控释尿素的N素释放速率大小。

Abstract: The captive test in the water and the potted planting experiment were used to study the nutrients releasing dynamics of polymer-coated-released fertilizer. The result shows that the preliminary solubility rate of nitrogen of tung oil-coated urea is 12.6% in the soil and 20.1% in the water meaning that tung oil is a preferable coating materials. The ratio of the releasing periods in the water to in the soil is 1:1.2. The kinetics equation of LOGISTIC could be used to express the nutrient release characteristics. The nitrogen release rate can be reflected by the velocity coefficient k.