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Evaluation of the ultisol system kaolinite-gibbsite in different relief forms

Grant number: 08/01371-4
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): April 01, 2008
Effective date (End): March 31, 2009
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal Investigator:José Marques Júnior
Grantee:Iara Caroline Gobi
Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil


The kaolinite-gibbsite system can be considered as indicating environment, and the position of the soil in the landscape, and parent material are factors that condition the variability of the soil attributes and between them the mineralogicals. The objective of this work is to evaluate the space dependence of the mineralogical attributes of a ultisol under different relief forms. Two regular grids having 100 x 100 m with poins in intervals of 10 m will be studied. The collected samples will be submitted to the analysis of laboratory for separation of the fraction clay and removal of iron oxides of the same one. Later the caulinita-gibbsita system by means of the X-ray diffraction will be evaluated, by using the powder method. The results gotten through the x-ray diffraction analysis will be submitted to descriptive statistics and geoestatistics for evaluation of the variability and space dependence.