Evaluation of P Supplying Capacities of South Western Nigerian Soils
Abstract
The phosphorus supplying capacities of some soils of South Western Nigeria were investigated in the green house with five consecutive harvests of maize (Zea mays L.). The P indices varied widely. The quantity P indices (Bray-1, Bray-2, Olsen and Resin P) were significantly correlated with P uptake and the relation tended to increase with cropping. However, the highest correlations were obtained with Olsen and resin P. Combination of Olsen and PBC accountedfor about 95 per cent variation in P uptake. Olsen or resin method used in conjunction with PBC should provide adequate information to characterize P needs of crops in the south western Nigerian soils.
Keywords
Phosphorus capacities, quantity indices, capacity index, intensity index
