含硫尿素养分缓释释放测定方法的研究

包膜尿素肥料是提高肥料利用率，解决环境污染问题的一种新型肥料。针对目前对缓释肥料释放特性的研究集中在化工制作领域这一现状，采用不同的测定方法，阐明含硫尿素中的养分氮在水及土壤中的转化特点，确定养分的释放速率，以求找出适合农业生产应用的方法。研究表明，可以用电导率法快速准确地定性评价缓释肥料的供肥特性和供肥速度，用土壤培养法和水培法定量测定其供肥性能。

Research on determine methods of slow release nutrient of sulphureous urea

Coated urea fertilizer is a new type fertilizer to improve fertilizer's usage rate and solve the environment pollution questions.This paper aimed at present status that most researches assembled in chemical products,adopted different determine methods,represented the transformation characteristic of nitrogen among water and soil of the sulphureous urea,confirmed the nutrient release speed,found out the optimum determine method in agricultural production application.The research indicated that the conductance measurement could appraise the supply characteristic and velocity of slow release fertilizer fast and accurately and qualitatively,while soil culture method and water cultivation could determine its supply performance quantitative.