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Ammonification and Nitrification of N as Influenced by Soil pH and Previous N Treatments¹

ABSTRACT

The effect of soil pH on rates of ammonification and nitrification was studied. Soil samples which ranged in pH from 4.7 to 6.6 from an established lime and N fertility experiment were used. Soil pH values in the lime plots have been relatively constant for several years. Soil pH did not affect rates of ammonification appreciably; however it had a significant effect on nitrification rates. Length of the delay period (t') was increased and rate of NO₃^- accumulation (Km) decreased with a decrease in soil pH. Previous field N treatments increased the length of t' at low pH and decreased t' and Km at high pH. Nitrification rates and production of NO₃^- were similar for soil pH values of 5.3, 6.0, 6.3, and 6.6 with a different pattern at pH 4.7.

¹ Contribution from the Dep. of Horticulture and Soil Science, Univ. of Wisconsin, Madison. Research supported by the College of Agricultural and Life Sciences, Univ. of Wisconsin, Madison, and the Wisconsin Aglime Producer's Association.

² Graduate Research Assistant, Associate Professor of Horticulture and Soil Science, and Professor of Soil Science, respectively.

Received for publication May 5, 1972. Accepted for publication October 10, 1972.