Summary
The behaviour of urease activity, ammoniacal N concentrations and pH in flood water and that of ammonia flux was investigated in a water-logged soil either in the presence or in the absence of rice and with three different treatments (control, urea and urea + phenyl phosphorodiamidate). In the presence of the phenyl phosphorodiamidate (PPD), that is a urease inhibitor, increases in ammoniacal N concentrations and in ammonia evolution were delayed but not eliminated. The degradation and/or the inactivation of PPD might have occurred, thus removing the inhibition of the enzyme activity.
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Pedrazzini, F., Tarsitano, R. & Nannipieri, P. The effect of phenyl phosphorodiamidate on urease activity and ammonia volatilization in flooded rice. Biol Fert Soils 3, 183–188 (1987). https://doi.org/10.1007/BF00255781
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DOI: https://doi.org/10.1007/BF00255781