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从山西省主要农田土壤中选取有代表性的耕层土壤样品 19个 ,应用生物耗竭法并结合化学方法对该省主要土壤的供钾能力进行综合评价。研究表明 ,供试的 19个土壤中无论不同形态钾含量还是耗竭后土壤钾素 (速效钾、缓效钾 )“最低水平”值的大小和出现前耗竭的茬数、作物吸钾量均存在较大差异 ,并因土壤类型、取土地区不同而异。“最低水平”值和作物吸钾量是土壤供钾的重要特征参数。供试山西土壤的长期供钾能力按取土地区有从南至北逐渐下降的趋势 ,在不同土壤类型上有红粘土、潮土 >黄绵土、褐土 >栗褐土、栗钙土的趋势。
Nineteen representative soil samples were selected from the main farmland soils of Shanxi Province. Bioavailability and chemical methods were used to evaluate the potassium supply potential of the main soils in the province. The results showed that the amount of potassium uptake in all the 19 soils tested was in the same range as the “lowest level” of soil potassium (available potassium and slow-acting potassium) after depletion Large differences, and because of soil types, take the soil area varies. The “lowest level” value and crop potassium uptake are important characteristic parameters for soil potassium supply. The long-term potassium supply capacity of Shanxi soil tended to decline gradually from south to north in terms of taking soil. There was a tendency of red clay, alluvial soil> loessial soil, cinnamon soil> chestnut brown soil and chestnut soil in different soil types.