Title: Effect of Phenylphosphorodiamidate on Immobilization and Ammonia Volatilization
Abstract:Abstract Laboratory incubation experiments were conducted to evaluate the ability of the urease inhibitor phenylphosphorodiamidate (PPD) to reduce NH 3 volatilization and immobilization of urea (100 m...Abstract Laboratory incubation experiments were conducted to evaluate the ability of the urease inhibitor phenylphosphorodiamidate (PPD) to reduce NH 3 volatilization and immobilization of urea (100 mg N kg −1 of soil). Application of 20 mg PPD kg −1 of soil effectively inhibited urea hydrolysis for approximately 4 d in both soil and oat straw‐amended soil systems. This delayed urea hydrolysis reduced NH 3 losses after 7 d from 82 to 19% in the straw‐amended soil, and from 26 to 14% in the soil system. When urea was applied to soil incubated in closed vessels, only 80% of the applied urea could be recovered as inorganic N after 3 d of incubation. This apparent immobilization of N was prevented for 7 d by application of PPD. Immobilization of N in the straw‐amended soil exceeded 40% within 7 d, but the onset of these losses was delayed for at least 3 d by PPD. These results demonstrate that losses of surface‐applied urea via both NH 3 volatilization and immobilization can be prevented by application of an effective urease inhibitor.Read More
Publication Year: 1987
Publication Date: 1987-07-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 13
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