Urea hydrolysis and the fate of ammonium produced were evaluated in bark : peat : sand, peat : vermiculite, and 14 commercial potting media, in cropped and uncropped samples. Urea hydrolysis was much more rapid in pine bark : peat : sand than in peat : vermiculite. Significant variation in urea hydrolysis was observed among the commercial media. Urea hydrolysis was more rapid in cropped than in uncropped media. Substantial net N immobilization was observed in most media. Although nitrification was evident, there was generally very little net nitrate accumulation. Differences in urea hydrolysis and ammonium accumulation were of sufficient magnitude to warrant consideration in fertilizer management.
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George C. Elliott (1986) studied this question.
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