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用黑麦连续耗竭栽培和盆栽棉花、田间小区种植棉花拖钾的办法,综合评价了湖北省七种旱地土壤的供钾能力。结果表明,黑麦从0—50厘米土层中累积吸钾为41.57—98.66毫克/100克士,说明供试土壤的供钾能力不同。棉花施用钾肥的效应,土壤间亦不同,可反映供试土壤供钾能力的上述差异。黑麦累积吸钾量中,有0—24%来自速效钾,来自缓效钾的占76—100%,缓效钾的含量及其释放速率与土壤粘粒矿物组成及其含量有关。
Continuous ruminant cultivation of rye and potted cotton, paddy field cotton cultivation methods, a comprehensive evaluation of the seven kinds of dry land in Hubei Province potassium supply capacity. The results showed that the cumulative potassium uptake of rye from 0-50 cm soil layer was 41.57-98.66 mg / 100 克 士, indicating that the potassium supply ability of the test soil was different. The effect of applying potassium fertilizer to cotton was also different between soils, which could reflect the above differences of potassium supplying ability of soil tested. Of the cumulative rye-uptake of rye, 0-24% came from quick-acting potassium and from slow-acting potassium accounted for 76-100%. The content of slow-acting potassium and its release rate were related to the composition and content of soil clay minerals.