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Urea Conversion to Ammonia in Waterlogged Soils¹

ABSTRACT

Urea hydrolysis to ammonia proceeded at about the same rate in waterlogged soils and in soils kept at bar moisture. Urea hydrolysis took place at an initial rate of about 8 to 12 ppm/hour and began to level off after about 24 hours. Maximum conversion of urea occurred at about pH 8 under both moisture conditions. Volatilization loss of ammonia hydrolyzed from surface applied urea was slightly greater at bar than under waterlogged conditions and was considerably greater under all conditions than was loss from surface applied ammonium sulfate. For topdressed urea in flooded soil, urea conversion was much more rapid in the surface layer of soil than in the flood water.

¹ Contribution from the Department of Agronomy, Louisiana State University. This study was conducted in cooperation with the Div. of Agricultural Development, Tennessee Valley Authority.

² Former Graduate Assistant and Professor, respectively.

Received for publication July 16, 1969. Accepted for publication April 6, 1970.