الفهرس 
Soil SalinityOnly 14 pages are availabe for public view
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Abstract
Soil salinity is a major problem of land degradation in Egypt, which reduces P nutrient availability for crop plants.Biochar amendment may be an effective solution of maintaining phosphorus(P)and sustaining agricultural production in salt affected soils.Residues from wastewater treatment can be added to soils as a soil amendment. However, the behaviour of P adsorption and desorption in salt affected soils with nano-biochar(nB)and nano-water treatment residuals(nWTR)amendment is unclear.Therefore, the aim of this study was to investigate the impacts of different levels of soil salinity amended with nB and nWTR on the P adsorption isotherm, P adsorption-desorption kinetics and also, mechanisms of P adsorption by using spectroscopic analysis.To achieve this study four soil samples with different levels of salinity were collected from Kafr El Shaikh Governorate, Egypt and non-saline soil sample from El Gharbia Governorate, Egypt. We mixed nB and nWTR, obtained by grinding biochar and raw residues of water treatment, with soil samples at rates of 0, 0.1%, 0.2%, and 0.5%, w/w. The P equilibrium and kinetic adsorption-desorption behaviour were conducted using batch experiments.Surface morphology and particle size of nB and nWTR were inspected using scanning electron microscopy(SEM)and transmission electron microscopy(TEM). Fourier transform infrared(FTIR)and X-ray diffraction (XRD) analyses were conducted to illustrate the changes of functional groups and the crystalline phases that formed before and after P adsorption.