phosphorus sorption characteristics in relation to soil properties in some calcareous soils of western azarbaijan province

phosphorus (p) sorption in soils is a key process governing its availability to crops. there has been scanty information available on the p sorption characteristics of calcare-ous soils of western azarbaijan province, iran. in this study, p sorption characteristics and their relationship to soil properties were determined in 36 soil samples belonging to 15 agricultural soil series located in the south of urmia, western azarbaijan province. total caco3 contents ranged from 10 to 48.5%. active caco3 contents ranged from 1.7 to 20% and were significantly related (r = 0.61, p