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Effect of Phosphate and Chloride Salts on Ammonification in Waterlogged Soils¹

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 x 10^-3, 1 x 10^-2, 2.5 x 10^-2, and 1 x 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 x 10^-2M.

¹ Contribution from the Dep. of Agronomy, Univ. of Kentucky Agr. Exp. Sta., Lexington. The investigation reported in this paper (72-3-20) is in connection with a project of the Kentucky Agr. Exp. Sta. and is published with the approval of the Director.

² Former Graduate Research Assistant, Associate Professor and Professor of Agronomy, Dep. of Agronomy, Univ. of Kentucky, Lexington 40506. The present address of the senior author is Dep. of Soil Sci. Univ. of Wisconsin, Madison 53706.

Received for publication May 3, 1972. Accepted for publication September 1, 1972.