【摘要】 为进一步揭示土壤保水剂与氮肥的互作效应,采用NH4Cl和KNO3作为指示氮肥,分析了6种保水剂的吸水保肥能力。结果表明:氮肥溶液中的离子强度、保水剂聚合物类型以及粒级是影响保水剂吸水率的关键因素。保水剂释放和吸收NH4+量高于NO3-量;其释放和吸附氮肥的能力,明显受粒级与生产过程中添加的复合成分的影响。保水剂与氮肥的互作效应主要受保水剂自身组成和结构及氮肥水溶液离子强度制约。研究表明土壤保水剂对氮肥的吸附使其具备保肥功能,对揭示其保肥机理具有重要理论意义。更多还原

【Abstract】 As the indicators of nitrogenous fertilizer,NH4Cl and KNO3 were applied with six kinds of super absorbent polymer(SAP) to study the relationship between SAP and nitrogenous fertilizer.Water absorbency(WA) and fertilizer conservation of SAP were studied.The results show that the ionic strength of the nitrogenous solution,polymer type and particle diameter are the most important factors on WA of SAP.The amount of NH4+ releasing and absorbing by SAP is much higher than that of NO3-.The ability of SAP releasing and absorbing nitrogenous fertilizer is influenced by the particle diameter and secondary component of SAP.The relationship between SAP and nitrogenous fertilizer is restrained by the composition and structure of SAP and the ion strength of the nitrogenous fertilizer solution.The results indicate that fertilizer conservation of SAP has the ability of absorbing nitrogenous fertilizer.It is important to disclose the mechanism of fertilizer conservation of SAP.更多还原