Inorganic phosphorus complexed with cations in the environment is most available to microbes at pH 4 and below because of solubility considerations.

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Inorganic phosphorus complexed with cations in the environment is most available to microbes at pH 7 and above because at higher pH levels, the phosphate ions become more soluble and accessible to microbes. At lower pH levels, the solubility of phosphorus decreases and so it is less available to microbes.

Inorganic Phosphorus Complexed with Cations in the Environment Is Most