Assessment of Nitrification and Ammonia Volatilization in Different Soils Texture Irrigated by Waste Water

A laboratory incubation experiment was conducted to assessment of nitrification and ammonia volatilization in different soils texture irrigated by waste water. In this study to determinate the rate of recovery NH4+, NO3- and NO2- 250g of air derided soil were placed in 500 screwed conical flask and (100ppm NH4) added as (NH4) 2SO4, then treated with two level of waste water of (T0=control and T1=treatment) waste water was applied to achieve a soil moisture content equivalent to 60 % of the water-holding capacity, 5ml of boric acid indicator solution added to test tube, the test tube putted inside the conical flask and the conical flask was capped and placed in an incubator maintained at 30C. The ammonia evolved was trapped in boric acid ( the color change from red to green) and determined by titration with standard H2SO4 0.01N. The results show the nitrification rate increased from light soil texture to heavy soil in texture the higher value of accumulated nitrate was found in silty loam texture compared to other soils texture, as well as the result indicated that the volatilized ammonia is higher in sandy clay loam soil compared to other soil texture which attained 5.457 mg kg-1, hoevere, addition of waste water to the soils resulted in a increase nitrification and decrease in the ammonia volatilization.