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Evaluation of Antimetabolites for Retardation of Urea Hydrolysis in Soils¹

ABSTRACT

Studies to evaluate three antimetabolites patented as inhibitors of urea hydrolysis in soils (pyridine-3-sulfonic acid, desthiobiotin, and oxythiamine chloride) showed that they had no effect on production of urease by soil microorganisms and did not retard urea hydrolysis in soils or reduce gaseous loss of urea N as ammonia, even when applied at rates far exceeding those recommended for inhibition of urea hydrolysis.

¹ Journal Paper no. J-8786 of the Iowa Agric. & Home Econ. Exp. Stn., Ames. Project 2096. This work was supported in part by the TVA.

² Research Associate and Professor, respectively, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011.

Received for publication March 18, 1977. Accepted for publication June 10, 1977.