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本项研究对江西省五种主要成土母质发育的红壤旱地土壤，按土属布点，共取表层土样２４８个，剖面样７５个，分别测定了全钾、缓效性钾和速效钾含量，查明了全省红壤旱地土壤全钾、缓效性钾、速效性钾含量平均分别为１６．７ｇｋｇ￣（－１）±７．３ｇｋｇ￣（－１）、２５１．９ｍｇｋｇ￣（－１）±１４５．９ｍｇｋｇ￣（－１）和６３．９ｍｇｋｇ￣（－１）±３２．４ｍｇｋｇ￣（－１），低于缺乏临界水平（速效性钾＜７０ｍｇｋｇ￣（－１）的样品占７９．５％。阐明了不同成土母质发育的红壤旱地颖型间的钾素含量的差异，以及影响钾素含量的因素有母质、含钾矿物、有机质、质地和粘粒。绘制出土壤缓效性钾、速效性钾含量分布图为红壤旱地土壤资源评价和合理施用钾肥提供了依据。
In this study, soil samples were collected from five dominant soils of red soil in Jiangxi Province. A total of 248 surface soil samples and 75 cross-section samples were collected. Soil total potassium, slow-acting potassium and available potassium The results showed that total potassium, slow-acting potassium and quick-acting potassium in soils of red soils in the whole province were 16.7gkg ~ (-1) ± 7.3gkg ~ (-1) and 251.9mgkg ~ (-1) ± 145.9mgkg ~ (-1) and 63.9mgkg ~ (-1) ± 32.4mgkg ~ (-1), respectively, which was lower than the critical level (79.7% of the available potassium was less than 70mgkg ~ (-1) %. The differences of potassium content between different glume phenotypes of red soil with different parent materials were illustrated, as well as the factors affecting potassium content including parent material, potassium mineral, organic matter, texture and clay. , The map of available potassium content provides the basis for soil resource assessment and rational application of potash fertilizer in upland red soil.