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新聞媒體

土壤中的營養元素

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土壤中的鉀根據其化學形態和對植物的有效性,分為礦物態鉀、非交換態鉀、交換態鉀和水溶態鉀 從土壤檢測角度來說,根據統計,設施栽培土壤中有效鉀含量適宜范圍定在120-400mg/L礦物態鉀:主要以原生或次生的結晶硅酸鹽狀態存在于土壤中的鉀,一般含量為5~25g/kg,占土壤全鉀量的90~98%土壤中含鉀多的礦物主要有長石、云母等硅酸鹽礦物。這些礦物抗風化能力強,鉀離子的釋放緩慢,難以被植物吸收利用,營養意義相對較小。

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