在酸碱性土壤中，磷主要以植物难以吸收利用的难溶性二价或三价阳离子的形式存在。
In acid and alkali soil, there are mainly indissoluble bivalent or trivalent phosphates, which cannot be utilized by plants.
本文就目前关于饲料中磷的生物学效价评定的方法即平衡试验法、斜率比法、估测法、三项指标综合法、体外溶解度法、体外透析法作一综述。
The methods of measuring the biological value of feed phosphorus including balance experiment, slope rate method, tri - index method, in vitro solubility and in vitro dialyse methods were reviewed.
(含)磷的，亚磷的磷的，有关磷的，或含磷的，尤指含三价磷或是比类似的磷化物低一价的。
Of, relating to, or containing phosphorus, especially with a valence of3 or a valence lower than that of a comparable phosphoric compound.
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