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在实验室条件下制得不同程度磷缓释的复混肥(磷缓释肥),分别测定以水为淋洗剂和以2%柠檬酸溶液为淋洗剂时在特定淋洗装置下水溶性氮、磷及有效磷随时间的溶出率,采用双曲线方程Xt=b a/t对肥料的累计养分溶出率进行分段拟合,在此基础上引入缓释指数评价各养分缓释特性。结果表明:磷缓释肥对磷的缓释作用强于氮,对有效性磷的缓释作用强于水溶性磷;其水溶性氮、磷缓释指数(SR IWN、SR IW P)和有效磷缓释指数(SR IAP)与肥料中加入的缓释剂硫酸镁相对含量(X)具有很好的正相关,其直线相关系数为0.7414、0.8958和0.9829,后两者分别达到显著和极显著水平;2%柠檬酸溶液几乎能溶出肥料中全部有效磷,从而证明了自制磷缓释肥的有效性。
Under different laboratory conditions, phosphorus-containing slow-release compound fertilizers (phosphate-controlled release fertilizers) were prepared and their water solubility under specific rinsing devices with water as eluent and 2% citric acid solution as eluent Nitrogen, phosphorus and available phosphorus with time dissolution rate, using the hyperbolic equation Xt = ba / t of the cumulative nutrient dissolution rate of the section fitting, based on the introduction of sustained-release index to evaluate the characteristics of each nutrient release. The results showed that the sustained-release effect of phosphorus-releasing fertilizer on phosphorus was stronger than that of nitrogen, and the release of effective phosphorus was stronger than that of water-soluble phosphorus. The water-soluble nitrogen and phosphorus slow release index (SR IWN, SR IW P) The SRIAP has a good positive correlation with the relative content of magnesium sulfate (X), which is the slow-release agent added to the fertilizer. The linear correlation coefficient of SRIAP is 0.7414,0.8958 and 0.9829, respectively, and the latter two are significant and extremely significant Level; 2% citric acid solution can almost dissolve all available phosphorus in fertilizer, which proves the effectiveness of self-made phosphorus slow release fertilizer.