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Inhibition by Xanthates of Nitrification and Urea Hydrolysis in Soil¹

ABSTRACT

Inhibition of urease activity and of nitrification by potassium xanthates was measured by adding them to soil amended with urea or (NH₄)₂SO₄ and determining the urea remaining or nitrate produced after incubation at 23°C. The xanthates of unsubstituted alcohols of low molecular weight were the best inhibitors of urease and nitrification. The effectiveness of nitrification inhibition was not well correlated with the amounts of CS₂ evolved from soil treated with xanthates in sealed Conway units.

¹ Contribution from Alberta Agric. Project Group "Farming for the Future."

² Visiting worker at Alberta Agric. Soil & Feed Testing Lab., Edmonton, Alberta; present address Soils & Plant Nutrition Dep., Rothamsted Exp. Stn., Harpenden, Herts, U.K.

³ Norwest Soil Res. Ltd., Edmonton, Alberta.

Received for publication January 7, 1980. Accepted for publication July 15, 1980.