RESIDUAL EFFECT OF PHOSPHOGYPSUM ON SODIUM DISTRIBUTION IN PROFILE OF SALT AFFECTED SOIL
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For the purpose of determining the residual effect of phosphogypsum (PG) in the removal of sodium from the profile of saline soil irrigated by saline ground water after two years from addition. Afield experiment was conducted in saline soil at Al-Tuwaitha Salinity Research Station 25 Km south of Baghdad (first season at year 2012 ) added rates of different phosphogypsum 25 , 50 , 75 , 100 and 125 (%) from gypsum requirements equal to 3.25 , 6.50 , 9.75 ,13.00 and 16.58 ( tan h-1 ) compared to control to remove sodium from soil profile to be suitable to plant . local variety of barley was planted as a biological indicator. Results showed that the percentage of sodium removal by Phosphogypsum were 52.00 , 30.54 and 26.26 (%) for the depths of 0-20 , 20-40 , 40–60 (cm) respectively after two years from addition compared with control and no effect of Phosphogypsum at depth of 60-80 cm because sodium ion accumulated in this depth. Also results showed decrease in sodium uptake by Barley percentage were 0. 42 % comparative with control as a result of Phosphogypsum, this results explain the residual effect of phosphogypsum addition after second season.
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Copyright (c) 2019 F.O. K. Al-Ghrairi, S.J. H. Dwenee, A.F.H. Al-Temimi, I.B. Abdulrazzaq, S.M. Al-Ghrairi, A.H. Taly (Author)
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