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Effects of Some Urease Inhibitors on Urea Hydrolysis in Soils¹

ABSTRACT

Studies reported showed that, of eight urease inhibitors tested (2,5-dimethyl-p-benzoquinone, catechol, p-benzoquinone, hydroquinone, phenylmercuric acetate, N-ethylmaleimide, sodium p-chloromercuribenzoate, and acetohydroxamic acid), 2,5-dimethyl-p-benzoquinone had the greatest ability to retard urea hydrolysis in soils and reduce gaseous loss of urea N as ammonia. Gaseous loss of urea N as ammonia from a urea-treated sandy soil incubated at 20C for 14 days was reduced from 61.1% to 0.3% by addition of 2,5-dimethyl-p benzoquinone (2.3 parts/100 parts of urea).

¹ Journal Paper No. J-7362 of the Iowa Agr. & Home Econ. Exp. Sta., Ames. 50010. Project 1835. This work was supported in part by TVA.

² Professor and Research Associate, respectively, Dep. of Agronomy, Iowa State University, Ames. Present address of junior author is: School of Agriculture, Univ. of Melbourne, Parkville, Victoria, Australia.

Received for publication August 25, 1972. Accepted for publication October 24, 1972.