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Abstract
Loss of Nitrogen from Ammoniacal Fertilizers Incubated
under Different Soil and Termperature Conditions.
A. S. Al-Mashhady
1983
Commun. in Soil Sci. Plant Anal. 14: 877-891
NO
Ammonium sulfate and urea were added to three soils of widely
different composition. After incubation for 28 days at 20o C, from
13 to 89% of the N from ammonium sulfate, and 8 to 71% of the
N as urea were not recovered, and at 40oC, 44 to 95% of the N as
ammonium sulfate, and 33 to 81% of the N as urea was not
recovered as either ammonium-N or nitrate-N. Significantly more
N was lost from a soil containing 3% calcium carbonate at pH 8.4
as compared to the two other soils containing 25 and 35% calcium
carbonate, which have pH's of 7.7 and 7.5, respectively. An
incubation temperature of 40oC appeared quite unfavourable for
nitrification.