有机物料对植烟土壤速效养分含量的影响

为探讨烟田中有机物料的养分释放问题，用砂滤管模拟的方法研究了几种常用有机物料施入紫色土烟田后土壤pH、有效氮、速效磷、速效钾以及有机质组分当季的变化情况。结果表明，水稻秸秆、花生饼肥、猪粪、生物有机肥皆可不同程度地提高烟株移栽后30～60 d土壤环境中有效氮、速效磷、速效钾的含量，保持土壤肥力及改善有机质品质。其中，花生饼肥提高土壤有效氮含量的幅度最大，其次为生物有机肥，且两者皆能在第60 d时适时下降，而生物有机肥保持土壤肥力及改善有机质品质效果最佳。

Effects of Organic Materials Application on Available Nutrient Contents in Tobacco Growing Soils

Carborundum tube simulation method was employed to study the changes of soil pH, major available nutrients and organic matters after application of organic materials in tobacco fields of puple soil in Nanxiong, Guangdong Province. Results showed that application of rice straw, peanut cake fertilizer, pig manure and bio-organic fertilizer could enhance the contents of soil available nutrients in 30-60 days after transplanting, with the maintenance of soil fertility and the improving of organic matters quality. The peanut cake fertilizer could most remarkably improve the content of available nitrogen, followed by bio-organic fertilizer, and the nitrogen level in both treatments declined at the 60th day after transplanting. Bio-organic fertilizer exhibited the optimum maintence of soil fertility and improving of organic matters quality.