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为揭示氮、磷施用水平对土壤pH值和有机质含量的影响,以海南水稻土为研究对象,采用水稻盆栽试验分析不同氮磷处理水平下的土壤pH值和有机质含量变化,以期为海南的合理施肥提供参考。结果表明:施用尿素和过磷酸钙,总体上会降低土壤pH,导致农田土壤酸化,且土壤酸化程度与其初始土壤pH值有关;适当的施用氮、磷,可提高土壤有机质含量,在供试条件下,对于pH较低的土壤,N2P2处理下的土壤有机质含量提高最为显著,而pH较高的土壤,N1P3处理下土壤有机质含量增加显著。
In order to reveal the effect of nitrogen and phosphorus application on soil pH and organic matter content, taking paddy soil in Hainan as the research object, the change of soil pH value and organic matter content under different levels of nitrogen and phosphorus was analyzed by pot experiment, Fertilization for reference. The results showed that the application of urea and superphosphate generally reduced the pH of the soil and led to the acidification of farmland soil. The degree of soil acidification was related to the initial soil pH value. Appropriate application of N and P could increase the content of soil organic matter, Under the condition of low pH, the content of soil organic matter increased most significantly under N2P2 treatment. However, the content of soil organic matter under N1P3 increased significantly in soil with higher pH.