Availability of phosphorus (P) and calcium (Ca) is a common constraint in tropical acidic soils limiting the potential of those soils for crop production. Under such conditions, phosphate rock (PR) could become a cheap source of P and Ca for crops. The dissolution of PR, however, is a slow process that has limited its use for annual crops requiring ready-available nutrients. This study was conducted to examine the effect of aluminum-tolerant maize genotypes on the rhizosphere pH and the consequent release of P and Ca from PR. Six aluminum-tolerant maize inbreds from CIMMYT and one from the local program of FONAIAP-CENIAP were used. Sources of P were Riecito PR (PR) and commercial triple super phosphate (TSP), applied at a dose of 400 mg kg Ϫ1 . Individual pre-1551
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