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本文对云南四种类型的红壤所含无机磷形态进行分析研究,其中磷酸铁占无机磷的20～30％,磷酸铝、磷酸钙各占10～15‰。闭蓄态磷一般在60％以上。山地红壤闭蓄态磷含量较低,约28～52‰。而磷酸铝、磷酸钙含量较其他类型红壤高。酸性红壤对磷的吸附量高,中性红壤的吸附量低。所以,山原红壤及山地红壤应多施磷肥,红色石灰土可少施或不施。
In this paper, inorganic phosphorus forms of four types of red soils in Yunnan Province were studied. Among them, iron phosphate accounted for 20-30% of inorganic phosphorus, and each of aluminum phosphate and calcium phosphate accounted for 10-15% o. Closed-state phosphorus is generally above 60%. The closed-state phosphorus content of the mountain red soil is relatively low, about 28 ~ 52 ‰. The aluminum phosphate, calcium phosphate content higher than other types of red soil. Acid red soil adsorption of phosphorus high, neutral red soil adsorption capacity is low. Therefore, the red soil and mountainous red soil should be more phosphate, red lime soil can be applied or not applied.