Effect of Irrigation Water Salinity on Phosphorous Adsorption in calcareous Soil

	Effect of Irrigation Water Salinity on Phosphorous Adsorption in calcareous Soil
AL-TAQANI
Article 1, Volume 24, Issue 1, 2011, Pages 137-146
Abstract
Incubation experiment was conducted to study the effect of irrigation water salinity phosphorous adsorption reactions in soil with time. 100gm of clay loam soil was put in container and each treated with 7 levels of phosphorous ( 0,1.6,3.2, 6.4 , 12.8 , 25.6 , 51.2 ) mmol P.kg-1soil as ](NH4)3PO4.3H2O[. SoiI containers were irrigated with 3 levels of saline water (1,2,4 ) dS.m-1 up to field capacity .All treated soil materials were incubated in an incubater at 25 ﹾ C for ( 3, 6, 12, 24 ) hours. After each period soil were analyzed for soluble P concentration in solution after equilibrium. Amount of P adsorbed on soil surface was calculated. The results were tested by liner langmuir equation and constants of this equation ( K,b), were calculated , and kinetics equation used . Results showed that increasing salinity of water increased P adsorption under all levels of P application and incubation P periods. Application of langmuire equation showed a good correlation of adsorption curve. Increasing rate of saline water increased P adsorption maximum (b) and bonding energy coefficient (K),and adsorption maximum percentage (b%) of P in soil .The best kinetic equation for description phosphorus adsorption was the power function equation : LnC = Ln a + b Ln t

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