氮磷钾肥交互作用对设施土壤盐分含量与离子组成的影响

通过室内模拟培养实验,研究了氮、磷、钾肥交互作用对设施土壤盐分含量与离子组成变化的影响。结果表明:①氮磷钾肥配施,土壤含盐量与钾肥的施用量呈显著正相关,而氮肥和磷肥施用量对土壤含盐量的影响不显著;②土壤电导率与含盐量呈极显著正相关,相同磷肥和钾肥用量时,设施土壤电导率随氮肥施用量增加呈升高的趋势,而不同磷肥用量对设施和露地土壤的电导率影响不显著;③施用氮肥可增加土壤溶液中K+、Na+、Ca2+、Mg2+、NO3-的含量;施用钾肥可增加土壤溶液中K+、Ca2+、Mg2+含量,磷肥对土壤盐分离子含量变化无显著影响。

Effects of Interaction Among Nitrogen,Phosphorus and Potassium Fertilizers on Salt Content and Ion Composition in Greenhouse Soil

The effects of interaction among nitrogen, phosphorus and potassium fertilizers on salt content and ion composition in greenhouse were studied through laboratory incubation experiment.The results were as follows:① With combined fertilization of nitrogen, phosphate and potassium, the salt content of greenhouse soil was in significantly positive correlation with application rate of potassium, but not influenced by application rate of nitrogen and phosphate fertilizer;② With the same application rate of phosphorus and potassium fertilizer, EC of greenhouse soil which had extremely significant correlations with salt content showed the obviously increasing trend with application rate of nitrogen, while the influence of application rate of phosphorus on EC is insignificant;③ Application of nitrogen could increase the content of K+, Na~+, Ca~(2+), Mg~(2+), NO_3~- in soil solution and also the content of K~+, Ca~(2+) and Mg~(2+) could be increased with application of potassium.Phosphorus fertilizer had little influence on the ion content.