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Abstract
Nitrification of Ammonium Sulphate and Urea in Soil as ffected
by Salinity and Organic Matter Supplementation.
R. M. El-Shahawy and H. A. Amer
1984
Proc.Saudi Biol.
No
A laboratory experiment was conducted to study the effect of
diluted sea water on nitrification of ammonium sulphate and urea
fertilizers in the absence or presence of organic matter. Increased
salinity delayed, suppressed or inhibited nitrification of both
fertilizers. Ammonification of urea seemed to be independent of
salinity. Nitrification, generally, was sensitive to salinity.
Addition of narrow C/N ratio organic matter (Berseem) enhanced
ammonification and nitrification while wide C/N ratio ones
(wheat straw) encouraged immobilization of mineral nitrogen.
Supplementing fertilizer nitrogen with organic matter alleviated
the adverse effect of salinity on nitrogen transformations in soil.