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本工作是研究在CaCO_3体系和石灰性土壤体系中NH_3的挥发与磷的吸附之间相互作用的化学变化,结果表明:在NH_4Cl—CaCO_3体系中,通气的pH值比不通气的低,但溶液中Ca~(2+)浓度正好相反。在K_2HPO_4-CaCO_3体系中,在24小时内,通气与不通气的,CaCO_3吸附磷没有差异。在24小时反应期间,在DAP-CaCO_3体系中,因溶液pH值不断增高,NH_3的挥发对CaCO_3吸附磷的影响也就逐渐降低。在石灰性土壤体系中,施用尿素加过磷酸钙或单施尿素时,几乎没有发现NH_3的挥发,而施DAP时,在6天后,NH_3的挥发损失占加入的56%,且DAP处理的土壤,其水溶性磷未通气比通气的高。尿素加过磷酸钙处理的,其水溶性磷通气与未通气的没有差异。另外,尿素加过磷酸钙或过磷酸钙单独处理的土壤,水溶性磷含量均相同。所有这些均表明,在石灰质体系中,NH_3的挥发(如果发生的话)能够加强CaCO_3对磷的吸附,而磷的吸附又能加强NH_3的挥发,两者是相互影响和相互促进的过程。
This work is to study the chemical changes in the interaction between NH 3 volatilization and phosphorus adsorption in CaCO 3 and calcareous soil systems. The results show that in the NH 4 Cl-CaCO 3 system, the aeration has a lower pH value than the non-aerated one, but the solution The concentration of Ca ~ (2+) is just the opposite. In K_2HPO_4-CaCO_3 system, there was no difference in aerated and non-aerated CaCO_3-adsorbed phosphorus within 24 hours. During the 24-hour reaction period, the effect of NH 3 volatilization on the phosphorus uptake by CaCO 3 gradually decreased in the DAP-CaCO 3 system due to the increasing pH of the solution. In the calcareous soil system, almost no NH3 volatilization was found when applying urea plus calcium superphosphate or urea alone, whereas when applying DAP, NH3 volatilization accounted for 56% of the addition after 6 days and DAP-treated soil , Its water-soluble phosphorus is not ventilated than aerated high. Urea plus calcium phosphate treatment, its water-soluble phosphorus aeration and no difference. In addition, urea plus calcium phosphate or superphosphate treated soil, water-soluble phosphorus content are the same. All of these indicate that the volatilization of NH_3, if any, can enhance the adsorption of phosphorus by CaCO_3 in calcareous system, while the adsorption of phosphorus enhances the volatilization of NH_3, both of which interact and interact with each other.