LIME EFFECTIVENESS OF SOME FERTILIZERS IN A TROPICAL ACID ALFISOL
2007, 8 (1) p. 17-24
Liming increases production costs and environmentally unfriendly. Effectiveness of crystalliser (CRYS), single super phosphate (SSP) and organic fertilizer (OF) for liming was evaluated by determining pH and phosphorus- (P)- availability in an acid alfisol incubated with the amendments, Ca(OH)2 being reference. Treatments were replicated thrice in completely randomised design. Un-amended soil remained acidic (pH 4.8) but liming raised pH (6.1-6.6), enhancing maximum (15.09-17.33 mg kg-1) P–release (un-amended having 4.24-7.09 mg P kg-1). Lime (L) and L+P treatments resulted in maximum pH increases (7.0-7.2), decreasing with incubation. Fertilizer treatments also raised pH (5.0-5.5 for OF, CRYS or SSP; 5.6-5.8 for CRYS +SSP, CRYS+OF and OF+SSP) relative to control (5.2). Acid soil infertility-ameliorating potential of CRYS and OF was revealed. They could be used multi-purposely as lime and P fertilizers by poor-resource farmers challenged by acid soil infertility factors.