An attempt to evaluate phosphorus fertilizer requirements of western Nigeria savannah soils
Ayodele, O.; Agboola, A.
Fertilizer Research 3(4): 293-302
A greenhouse fertilizer trial was carried out on 60 surface soils of the western Nigeria savannah derived from basement complex rocks. Bray's P1 available P in the soils varied between 1 and 112 mu g ml-1. Maize responded to P additions and a critical P level of 12.7 mu g ml-1 was calculated for the soils. For 22 of the soils, a laboratory incubation technique was used to determine P fixation, evaluated as changes in Bray's P1 extractable P with time.