桐油包膜复合肥料可溶固形物和磷的缓释性研究

Study on the slow release feature of total dissolved solid and phosphorus in tung oil-coated compound fertilizer

用浸泡法和有土柱淋溶法对桐油包膜复合肥料进行了溶出实验,用重量法和铋磷钼蓝分光光度法对桐油包膜复合肥料水溶出液中的固形物和五氧化二磷(P2O5)进行了测定,评述了这类包膜复合肥料的总可溶出物和磷的缓释特性。结果表明,固形物溶出率描述的总养分释放规律与P2O5溶出率描述的磷释放规律基本一致,但在某些包膜复合肥料如BJF中,其P2O5的释放明显滞后于固形物的释放。图2,表2,参12。

Water solution in soaking and water leaching in soil column were conducted for two kinds of tung oil-coated compound fertilizer （TCC）, the total dissolved solid （TDS） and P2O5 content in the water-dissolving solution obtained by above mentioned experiment were determined by gravimetry and spectrophotography respectively, further the TDS and P2O5 slow release were evaluated. The results shown that total nutrient release described by TDS determination was very closed to the phosphorus release described by P2O5 content determination, but certain TCC （such as BJF） made even slower release for P2O5 than TDS.