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采用田间调查与室内分析相结合的研究方法 ,研究了石首市农田土壤有机质、碱解氮、有效磷、速效钾和pH的变化,并对石首市土壤肥力进行了评价。结果表明,石首市旱地土壤三级与四级的比例相对最大,而水田土壤中二级与三级地的比例相对最大,水田土壤肥力水平普遍高于旱地土壤。与1982年全国土壤普查结果比较,30年来石首市农田土壤肥力水平呈下降趋势。
The soil organic matter, alkaline hydrolysis nitrogen, available phosphorus, available potassium and pH in farmland of Shishou City were studied by field investigation and indoor analysis. The soil fertility of Shishou City was evaluated. The results showed that the ratio of the third grade and the fourth grade of the soil in Shishou City was the largest, while the ratio of the second grade to the third grade in the paddy soil was the largest. The soil fertility of the paddy field was generally higher than that of the dryland soil. Compared with the results of the 1982 National Soil Survey, the soil fertility of farmland in Shishou City has been declining over the past 30 years.