AGRONOMIC EFFICIENCY OF NATURAL PHOSPHATES AND THEIR INFLUENCE ON SOIL AVAILABLE PHOSPHORUS ON TWO CERRADO SOILS

Authors

  • Huberto José Kliemann
  • David Vieira Lima

Keywords:

Oxisols, soybeans, phosphates sources, chemical extractors, soybean

Abstract

To evaluate the agronomic efficiency of natural phosphates soybean was grown in two oxisols under cerrado vegetation, using apatites (Araxá, Patos de Minas, Tapira, Abaeté, and Catalão), phosphoric bauxites (Pirocaua and Phospal), Gafsa hyperphosphate, nd IPT thermophosphate, using triple superphosphate as a control. he agronomic efficiency indexes found were: a) apatites - Araxá nd Abaeté, 27%; Patos de Minas, 13%; Tapira, 5%, and Catalão, %; b) phosphoric bauxites - Pirocaua, 41% and Phospal, 50%; c) hermophosphate IPT, 97% and hyperphosphate of Gafsa, 102%. he acid extractor Mehclich-1 overestimates available P when nsoluble apatites are applied to soils. Bray-1 and Bray-2 extractors referably solubilize the aluminum phosphates from phosphoric auxites. Critical levels of soil available phosphorus are suitably stimated by Bray-1 extractant when apatitic phosphates and by ehlich-1 extractant phosphoric bauxites are applied.

KEY-WORDS: Oxisols; soybeans; phosphates sources; chemical extractors; soybean.

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Author Biography

Huberto José Kliemann

Escola de Agronomia da Universidade Federal de Goiás - Cx. Postal 131, CEP 74001-970. Goiânia – GO.

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Published

2007-11-26

How to Cite

KLIEMANN, H. J.; LIMA, D. V. AGRONOMIC EFFICIENCY OF NATURAL PHOSPHATES AND THEIR INFLUENCE ON SOIL AVAILABLE PHOSPHORUS ON TWO CERRADO SOILS. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 31, n. 2, p. 111–119, 2007. Disponível em: https://revistas.ufg.br/pat/article/view/2472. Acesso em: 18 may. 2024.

Issue

v. 31, n. 2, Jul./Dec. 2001

Section

Research Article

License

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