Phosphorus (P) has ever been a matter of concern in agriculture worldwide. In highly weathered soils, the understanding of P chemistry is of pivotal importance as P is one of the most limiting factors in terms of soil fertility and, ultimately, food production. Not far off, soils of temperate zones often face eutrophication of water supplies caused by the unwanted excess of P, much as a result of agricultural operations.
One way to gain insight on the fate of P in the environment is to improve our understanding of P retention/release on soil components and soils. Assessing sorption mechanisms allows one to determine the solubility, cycling and bioavailability of P in the environment, which will, eventually, affect soil fertility/plant nutrition and water quality.
With the advent of advanced molecular-scale techniques, one is now able to study the effects of time, P forms and concentration on sorption/desorption processes and provide predictions on an atomic/molecular basis on mechanisms of P retention and release from soil solids.
My research is intended to examine the time dependence, the pH and surface loading effects on P sorption/desorption reactions as well as the mechanisms associated in these processes at the goethite/water interface. Extended X-ray absorption fine structure (EXAFS) spectroscopy and the stirred-flow techniques are employed to this end.
ABDALA, Dalton Belchior ;. SPARKS Donlad L. Use of Extended X-Ray Absorption Fine Structure Spectroscopy (EXAFS) to Differentiate the Continuum Between Phosphate Sorption Mechanisms On Goethite. ASA-CSSA-SSSA 2010 International Annual Meetings, "Green Revolution 2.0: Food + Energy and Environmental Security," Long Beach, CA, Oct. 31 - Nov. 3, 2010.
ABDALA, Dalton Belchior ; SILVA, Ivo Ribeiro da ; LOURENÇO, G. F. ; NOVAIS, Roberto Ferreira de ; ALVAREZ V., V. H. . Phosphorus Sorption Isotherms in a Highly Weathered Soil as Affected by Repeated Applications of Poultry Litter. In: Fertbio 2008 - Desafios para o Uso do Solo com Eficiencia e Qualidade Ambiental, 2008, Londrina. Annals of Fertbio 2008, 2008.
LOURENÇO, G. F. ; SILVA, Ivo Ribeiro da ; ABDALA, Dalton Belchior ; NOVAIS, Roberto Ferreira de ; ALVAREZ V., V. H. . Short-Term Effects of Consecutive Poultry Litter Application on Corn Yield, Soil Chemistry and Potential Phosphorus Loss. In: Fertbio 2008 - Desafios para o Uso do Solo com Eficiencia e Qualidade Ambiental, 2008, Londrina. Annals of Fertbio 2008, 2008.
ABDALA, Dalton Belchior ; SILVA, Ivo Ribeiro da ; NOVAIS, Roberto Ferreira de ; NUNES, F. N. . Phosphorus Mobility Potential in a Highly Weathered Soil Fertilized with Poultry Litter Under Field Conditions. In: XXXl Congresso Brasileiro de CIencia do Solo, 2007, Gramado. Annals of the XXXl Brazilian Congress of Soil Science, 2007.
ABDALA, Dalton Belchior ; SILVA, Ivo Ribeiro da ; JESUS, Guilherme Luiz de ; NOVAIS, Roberto Ferreira de ; BARROS, Nairam Félix de . Biological Coefficient Utilization of Calcium and Phosphorus by Eucalypt Plants as Influenced by Rates and Reactivity of Phosphates Sources and Poultry Litter. In: XXXl Congresso Brasileiro de Ciencia do Solo, 2007, Gramado. Annals of the XXXl Brazilian Congress of Soil Science, 2007.
Academic Fellowships and Scholarships
DENIN fellowship: Ph D. in Environmental Soil Chemistry. 2008 to present.
CAPES fellowship: Master of Science research. 2006 - 2008
CAPES scholarship: Undergraduate research program. 2005