Availability and transformation of rock phosphates in three forest soils from southern Nigeria

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Abstract
The initial effectiveness of 2 rock phosphate samples from Morocco (MRP) and North Carolina [USA] (NCRP) was compared with concentrated superphosphate (CSP) in greenhouse using 2 Alfisols and 1 Ultisol from southern Nigeria. Under similar pH condition (pH 6), the 2 rock phosphates were more effective P sources for a maize plant in the 2 Alfisols than in the limed Utisol. The relative effectiveness of the 3 P sources on corn yield followed the order of CSP > NCRP > MRP. A larger portion of rock P (Ca-P) applied to soils was transformed into Al-P and Fe-P from the NCRP source than from the MRP source after 90 days.