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Provedor de dados:  Repositório Alice
País:  Brazil
Título:  Analyzing the mobility in granular forms of P fertilizer in brazilians soils under laboratory conditions.
Autores:  CASTRO, R. C. de
ANJOS, M. J. dos
Data:  2014-02-12
Ano:  2013
Palavras-chave:  Phosphorus
Resumo:  Phosphorus is an essential nutrient for plant growth. Million of tones of P are applied to the soils annually. However, only a small fraction of the P applied with fertilizers is taken up by crops in the year of application, and the effectiveness of any residual P fertilizer declines with time. To improve our understanding of the mechanisms underlying this response to P in the field, we have studied the mobility of P from 3 different fertilizes: monoammonium phosphate (MAP), polymer coated monoammonium phosphate (MAPp) and Organomineral phosphate (OMP) applied on high weathered soil samples in a Petri dish experiment. Total Reflection X-Ray Fluorescence (TXRF) was used to determine the P diffusive flux at different distances (0 - 7.5, 7.5 ? 13.5, 13.5 ? 25.5 and 25.5 ? 43 mm) from granular fertilizer. TXRF analyses were performed at the X-Ray Fluorescence Beamline D09B at Brazilian National Synchrotron Light Laboratory (LNLS), in Campinas, São Paulo, using a polychromatic beam with maximum energy of 20 keV for the excitation and an Ultra-LEGe detector with resolution of 148 eV at 5.9 keV. Besides that, the detections were performed in a high vacuum chamber (2.5 x 10-5 mbar) to avoid air absorption. After a period of five weeks, the total P concentration increased in the soil sampled 7.5 to 13.5 mm from the fertilizer showing a diffusive flux of P. About 20% (considering MAP and MAPp) of the total P applied diffused out of the central soil ring. Different sources showed differences in diffusive flux of P. Soil pH also influenced diffusive flux of P showing higher flux on lower pH soils.

Tipo:  Artigo em anais de congresso (ALICE)
Idioma:  Português
Identificador:  17950
Editor:  In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE/INAC, 2013. Recife/PE. Anais... Rio de Janeiro, RJ: Associação Brasileira de Energia Nuclear, 2013.
Relação:  Embrapa Solos - Artigo em anais de congresso (ALICE)
Formato:  8p.

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