Abstract
Five soils, representing different locations in Egypt that vary in their climatic conditions, were studied for their nitrifying capacity under different temperature levels. The optimum temperature was 30 degrees C, followed by 20 degrees C. At both temperatures no differences among soils in their nitrifying capacity were observed, and nitrification approached completion after 4 and 6 weeks, respectively. NH4-N osication proceeded at lower rates of 10 degrees and 40 degrees C, but variations among soils in their capacity were observed. At 50 degrees C nitrification took place at fairly high rates in one soil, representing an area characterized by its extreme aridity and high temperature.
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