Studies on the Relationship Between Sesquioxides, Phosphorus Contents and Phosphorus Fixing Capacity of Coffee Soils of South India

Thirty three surface soil samples representative of typical coffee growing areas of South India were analysed for R₂O₃, Fe₂O₃, Al₂O₃, free iron oxides, and total and available phosphorus to ascertain their interrelationship. It is found that a close correlation was found to exist between R₂O₃, Fe₂O₃, Al₂O₃ and free iron oxides land total and available phosphorus indicating that sesquioxides, particularly free iron oxides contributed to fixation of phosphorus in these soils.