论文部分内容阅读
本文介绍一种用于大规模土壤咨询分析的离子交换树脂法,可同时提取土壤中的磷、钾、钙、镁。主要步骤有:水中加入玻璃珠振荡15分钟分散土壤;用碳酸氢钠处理的阴离子和阳离子交换树脂的混合物振荡16小时代换土壤中的元素;树脂与土壤的分离是通过过滤,然后,从树脂中提取元素。树脂法提取钙、镁、钾的结果与1M NH_4OAc 浸提的这些元素,IM KCl 浸提的钙、镁及0.025M H_2SO_4浸提的钾的结果相当。树脂可提取的磷值不能与常规方法,即0.025M H_2SO_4浸提的结果相比。同28个棉花试验施磷特性曲线比较(r=0.85~(**)),与0.025M H_2SO_4浸提磷比较(r=0.68~(**)),及与8个低地土样水稻盆栽试验磷的吸收值比较(r=0.98~(**))都呈显著相关,但同0.125M H_2SO_4+0.050M HCl浸提磷值比较相关不显著。文中并对磷提取所具优势的原因也进行了讨论。
This article presents an ion exchange resin method for large-scale soil analysis and analysis that simultaneously extracts phosphorus, potassium, calcium and magnesium from soil. The main steps are as follows: the glass beads are added to the beads and shaken for 15 minutes to disperse the soil; a mixture of sodium bicarbonate-treated anion and cation exchange resin is shaken for 16 hours to replace the elements in the soil; the resin is separated from the soil by filtration; In the extraction element. Results of resin extraction of calcium, magnesium and potassium were comparable to those extracted with 1 M NH 4 OA, potassium leached with IM KCl, and potassium leached with 0.025 M H 2 SO 4. The resin-extractable phosphorus values can not be compared with the results of the conventional method, 0.025 M H 2 SO 4 leach. Compared with the phosphorus application (P = 0.85 ~ (**)) of 28 cotton plants, the phosphorus uptake efficiency of 0.025 M H_2SO_4 (r = 0.68 ~ (**) There was a significant correlation between phosphorus uptake (r = 0.98 ~ (**)), but no significant correlation with phosphorus uptake by 0.125M H_2SO_4 + 0.050M HCl. The paper also discussed the reasons for the advantages of phosphorus extraction.