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SOIL ATTRIBUTES AFTER THE CONVERSION FROM FOREST TO PASTURE IN AMAZON

Authors

  • A. M. de Souza Braz,

    Corresponding author
    1. Graduate Student in Soil Science and Plant Nutrition, University of São Paulo (ESALQ/USP), C.P.9, Piracicaba 13418-900, SP, Brazil
    • Graduate Student in Soil Science and Plant Nutrition, University of São Paulo (ESALQ/USP), C.P.9, Piracicaba 13418-900, SP, Brazil.
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  • A. R. Fernandes,

    1. Institute of Agricultural Sciences, Federal Rural University of Amazonia (ICA/UFRA), C.P.917, Belém 66077-530, PA, Brazil
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  • L. R. F. Alleoni

    1. Department of Soil Science, ESALQ/USP, C.P.9, Piracicaba 13418-900, SP, Brazil
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    • Associate Professor.


ABSTRACT

The conversion from forest to grassland is drastically changing soil characteristics in Amazon, leading to land degradation when it is poorly managed. Chemical and physical changes of a Typic Hapludox were evaluated as a function of the conversion (by means of fire) from forest to Brachiaria brizantha cultivation. Samples from the remaining forest were also sampled. Treatments were made to pastures eight (P8), thirteen (P13) and fifteen (P15) years after conversion, and to land under continuous grazing, and to a remaining forest area (control). The forest soil was more acidic than the pasture soils. Soil density and Ca+2 increased after the conversion, regardless of the period of grazing. Carbon stocks varied from 31·2 t ha−1 in the forest soil to 37·4 (P8), 33·5 (P13) and 30·7 t ha−1 (P15). Copyright © 2011 John Wiley & Sons, Ltd.

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