EVALUATION OF UREAFORM ACTIVITY IN SOIL

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Abstract
Minerlization of two ureaform components was stusdied in incubation experiments in a sandy loam soil of pH 7.6, at 15 and 30°C. The compounds, a commercial type named UFH and a newly developed type named UFCC,2 differed in their solubility, having activity indexes of 46.4 and 85.6 percent, respectively. Ureaform decomposition in soil was found to be a first-order reaction. The rate constatnt of UFH decomposition were 1.60 × 10-3 and 4.78 × 10-3 days-1 at 15 and 30°C, respectively, and those of UFCC were 2.38 × 10-3 and 9.20 × 10-3 days-1. Response of three successive cuts of ryegrass to the ureaform compounds was studied in a greenhouse experiment. UFCC gave higher yields and higher recovery of nitrogen by the plants than UFH. A linear relation was found between nitrogen uptake and nitrogen release from ureaform. This last quantity was calculated, using the rate constants found in the laboratory experiment. © Williams & Wilkins 1979. All Rights Reserved.

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