Availability of copper, iron, manganese and zinc in soils under pastures in the Brazilian Cerrado

Vendrame, P.R.S.; Brito, O.R.; Quantin, C.; Becquer, T.

Pesquisa Agropecuaria Brasileira 42(6): 859-864

2007


ISSN/ISBN: 0100-204X
Accession: 015104982

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Abstract
The total and available Cu, Fe, Mn and Zn contents of soils under cerrado pastures were determined as well as their relation with oxisols acidity, fertility, texture and mineralogy. Soil samples were obtained from three regions: along the highways GO-060 and BR-154, between the towns of Goiania, GO, and Barra do Garcas, MT; in the northeast of the State of Minas Gerais, in the towns of Unai and Paracatu, MG; and in the Federal District. Fifty-four soil samples were collected from the 0-20 cm layer. It was found that available amount of Cu, Fe, Mn and Zn (DTPA extracted) was related to the total contents, chemical variables, soil texture and mineralogy. The available and total Cu, Fe, Mn and Zn content varied greatly. The availability of Fe, Cu and Mn was mainly related to the crystalline iron and pH in water. The availability of Zn was mainly related to the soil ion exchange capacity. Zn was considered the most frequent limiting micronutrient for cerrado pasture development.