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过磷酸钙等磷肥在土壤中移动性小,而且易被土壤中钙、镁、铁、铝等二价阳离子固定,必须巧施过磷酸钙,才能充分发挥肥效.
Phosphoric acid such as superphosphate is less mobile in the soil and is easily immobilized by divalent cations such as calcium, magnesium, iron and aluminum in the soil. It is necessary to apply superphosphate to make full use of the fertilizer effect.