Abstract
A greenhouse experiment with soils from five Brazilian savannah (cerrado) sites – Alfisol (PVAe), Oxisol (LVd, LVdf, LVAd), and Quartzipsamment (RQo) – was carried out and phosphorus availability from natural phosphatic fertilizers (Arad phosphate – Israel; phosphoric bauxite – Senegal; and Araxa phosphate – Brazil) was evaluated. The Mehlich-1, Mehlich-3 and resin extractants were used. A completely randomized design with eleven treatments and three replications was used. Response curves with triple superphosphate (TSP) and inclusion of phosphatic sources were used, with millet ( Pennisetum thyphoides ) as testing crop. Obtained data showed that: (i) the applied phosphates showed higher efficiency on dystrophic Oxisols than on the sandy soil (Quartzipsamment); (ii) Arad and Phospal phosphates are good alternatives as phosphorus suppliers for savannah soils and crops; (iii) Mehlich-1, Mehlich-3, and resin extractants showed equivalent performance on the estimation of soil available P, applied as triple superphosphate. KEY-WORDS: Brazilian savannah; phosphate sources; chemical extractants.
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