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代换性钙、镁含量低,是我省红壤、黄壤地区低产的重要原因之一.一般土壤代换性钙占代换性盐基总量的80%以上,镁占15%,而钾、钠很少超过5%.所以测定土壤代换性钙、镁可以了解红壤、黄壤熟化程度,为中、低产田改良,稻田施用石灰提供依据.据报导土壤代换性钙低限应达4.29毫克当量/100克土,代换性镁不低于0.4毫克当量/100克土.提取代换性钙、镁的标准法系采用:1N中性醋
Replacement of calcium and magnesium content is low, the red soil in our province, yellow soil area one of the important reasons for low yield.General substitutional calcium accounted for more than 80% of the total substituted base, magnesium accounted for 15%, while potassium, Sodium is rarely more than 5% .Therefore, determination of soil replacement calcium and magnesium can understand the maturity of red soil, yellow soil, for the improvement of middle and low yield fields, paddy lime application basis.Reportedly, the soil replacement calcium should reach 4.29 mg Equivalent per 100 grams of soil, substitutional magnesium is not less than 0.4 mg equivalent / 100 grams of soil Extraction of alternative calcium and magnesium standard method used: 1N neutral vinegar