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Abstract Samples of a Chestnut and Chernozem soil, with and without additions of (NH 4 )SO 4 and K 2 HPO 4 , were incubated at constant water contents ranging from suctions of 0.2 to about 100 bars, and the exchangeable NH 4 ‐ and soluble NO 2 ‐N measured periodically. NO 2 ‐N in excess of 1/3 ppm was never detected. Addition of P had no effect on N transformations. Ammonification and nitrification of soil N were almost directly proportional to soil water content at suctions between 0.2 and 15 bars. Measurable ammonification and nitrification occurred at a suction of 15 bars.
Reichman et al. (Sun,) studied this question.