Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/10711
Título: P-sorption and desorption in savanna brazilian soils as a support for phosphorus fertilizer management
Título(s) alternativo(s): Sorção e dessorção de fósforo em solos do cerrado brasileiro como suporte para recomendação da adubação fosfatada
Palavras-chave: Phosphorus adsorption capacity
Langmuir
Soil fertility management
Correction of phosphorus deficiency
Capacidade de adsorção de fósforo
Langmuir
Manejo da fertilidade do solo
Correção da deficiência de fósforo
Data do documento: 1-Nov-2013
Editor: Universidade Federal de Lavras
Citação: PINTO, F. A. et al. P-sorption and desorption in savanna brazilian soils as a support for phosphorus fertilizer management. Ciência e Agrotecnologia, Lavras, v. 37, n. 6, p. 521-530, Nov./Dec. 2013.
Resumo: Phosphorus (P) sorption by soils is a phenomenon that varies depending on soil characteristics, influencing its intensity and magnitude, which makes it a source or drain of P. The objective of this study was to determine the Maximum Phosphorus Adsorption Capacity (MPAC) and desorption of P from soils under native Savanna Brazilian and verify the correlation between MPAC and P Capacity Factor (PCF) with the chemical and physical properties of these soils. The study was conducted in seven soils under native Savannas. The Langmuir isotherms were adjusted from the values obtained in sorption assays, being evaluated the MPAC, the energy adsorption (EA) and PCF, which was calculated according to the levels of P-adsorbed and P-sorbed. Values of MPAC were classified as high in most soils, ranging from 283 up to 2635 mg kg-1 of P in the soil and were correlated with soil organic matter, clay, silt, sand, base saturation and pH. The PCF was higher in soils where the MPAC was also higher. The use of only one attribute of soil (clay content) as a criterion for the recommendation of phosphated fertilization, as routinely done, is susceptible to errors, needing the use of more attributes for a more accurate recommendation, as a function of the complexity of the interactions involved in the process
URI: http://repositorio.ufla.br/jspui/handle/1/10711
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