Phosphorus Sorption in Some Great Soil Groups of Iraqi Kurdistan Region

Ghafoor A. Mam Rasul, Kamil Sabier Saeed
Soil and Water Science Dept, Agricultural Sciences Faculty, Sulaimani University/Iraq

Phosphorus (P) sorption in soils is a key process governing its availability for
crops. There is scanty information on the P sorption characteristics of calcareous soils of
Kurdistan region of Iraq. P sorption characteristics were determined in seven soil
samples belonging to four agricultural soil great groups located in Sulaimani province.
(Xerorthents, Haploxererts, Haploxerolls and Calcixerolls). Total equivalent CaCO3
contents ranged from (33.80 to 350.65 g kg-1). Active CaCO3 contents ranged from
(20.00 to 150.00 g kg-1). The amount of available P contents ranged from (4.49 to 6.92 mg
P kg-1soil). Langmuir and Freundlich models were applied on seven different textured
calcareous soils, in order to characterize the P adsorption isotherm for these soils.
Langmuir and Freundlich parameters (KL, b, Kf and 1/n) values were (130.00 to 800.00
L mg-1, 28.57 to 76.92 mg kg-1, 42.27 to 121.06 mg kg-1and 0.656 to 0.974 ) respectively.
High values of (KL) for all investigated soil samples indicate a strong attraction between
sorbed P and sorbent surface.

Key words: Phosphorus, adsorption, precipitation, Langmuir and Freundlich isotherms,
calcareous soils.


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