Cationic Selectivity in Soils from Najaf and Dywinya provinces

Abstract

This study was carried out on two soils (Najaf, dywinya) provinces to assess soil selectivity for monovalent cation (Na) than divalent cation (Ca+Mg) by determining of (kg) Gapon cofficient result from Gapon equationSoils treated by three electrolyte solutions with concentration (25, 75, 125) mmole.c.L-1 as (Na : Ca+Mg) system. Their included mixture of (NaCl : CaCl2+MgCl2) salts with these proportions of (Na: Ca+Mg) were (0:5, 1:4, 2:3, 3:2, 4:1, 5:0) respectively. the difference selectivity of these soil related with decrease clay mineral ratio which tend to absorpe (Ca+Mg) than (Na) in D location. while increase salinity degree (ECe) in N location . KG coefficients reached on (0.016, 0.019) mmole.c.L-0.5 respectively. withal the values of correlation factor was revealing no effect on the linear relation ESR,SAR their were (r = 0.98,r = 0.96, r = 0.98, r = 0.88, r = 0.93, r = 0.85) at mentioned concentrations of locations D, N, respectively.