AGRONOMIC EFFICIENCY OF ROCK PHOSPHATES ON MILLET YIELD IN SAVANNAH SOILS

Authors

  • Elihu de Almeida Santos
  • Huberto José Kliemann

Keywords:

Rock phosphates, performance, savannah, millet

Abstract

A greenhouse experiment was undertaken to assess the agronomic efficiency of rock phosphates in five savannah soils. Standard response curves (0 kg ha-1, 100 kg ha-1, 200 kg ha-1, 400 kg ha-1, and 800 kg ha-1 of P2O5) with triple superphosphate (TSP) were used, including two rates (200 kg ha-1 and 800 kg ha-1 of P2O5) of alternative phosphate sources (Arad phosphorite - Israel, phosphoric bauxite - Senegal, and Araxá apatite - Brazil). Millet (Pennisetum thyphoides) was used as test crop. Data show the following ranking for agronomic efficiency: phosphorite > bauxitic phosphate > apatitic phosphate. Mehlich-1 extractant solubilizes apatitic phosphates, over-estimating the available phosphorus (P) in soils. Critical levels for Mehlich-1 and resin extractants, to which data of available phosphorus from natural phosphate treatments have been added, differed among each other, but were higher than those obtained with triple superphosphate alone. The extractants behaved in a similar way as related to the extraction of soil available P.

KEY-WORDS: Rock phosphates; performance; savannah; millet.

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Author Biography

Elihu de Almeida Santos

Fundação de Ensino Superior de Rio Verde (Fesurv), Caixa Postal 104, CEP 75900-000 Rio Verde, GO. E-mail: elihu@fesurv.br

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Published

2007-10-26

How to Cite

SANTOS, E. de A.; KLIEMANN, H. J. AGRONOMIC EFFICIENCY OF ROCK PHOSPHATES ON MILLET YIELD IN SAVANNAH SOILS. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 36, n. 2, p. 75–81, 2007. Disponível em: https://revistas.ufg.br/pat/article/view/2129. Acesso em: 22 nov. 2024.

Issue

v. 36, n. 2, May/Aug. 2006

Section

Research Article

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