Effect of Phosphate and Chloride Salts on Ammonification in Waterlogged Soils

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Abstract
A survey of 15 different soil types indicated ammonification under waterlogged conditions was usually decreased by addition of KH2PO4, although occasional increases were observed. Ammonification in the Pembroke soil was studied in more detail with varying concentrations (0, 1 × 10‐3, 1 × 10‐2, 2.5 × 10‐2, and 1 × 10‐1M) of KH2PO4, NaH2PO4, KCl and NaCl and between 7 and 35 days of incubation. In general, ammonification increased as the incubation period increased and decreased as the salt concentration increased. There was a significant interaction between salt treatments and incubation periods, reflecting the tendency of ammonification to be decreased more at intermediate incubations than at longer incubations. Potassium salts generally depressed ammonification more than did Na salts, especially in the phosphate series. Of the anions, the depression was greater with Cl salts than with P salts for most short term incubations, but the reverse was true for the 35‐day incubation. The critical concentration for the salts in this study was about 2.5 × 10‐2M.

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