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Relations between spatial variability soil attributes physical of the oxisol and quality of citric fruits

Grant number: 05/03513-2
Support type:Regular Research Grants
Duration: December 01, 2005 - November 30, 2007
Field of knowledge:Agronomical Sciences - Agronomy
Principal Investigator:José Marques Júnior
Grantee:José Marques Júnior
Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil


The study of the relations soil-landscape, involving the characterization of the spatial variability of attributes of the soil and plants, if has become important the measure that if tries to establish relations of cause and effect of the standards of spatial distribution of the attributes of the soil and of fruits. Since these practical better make possible adequacy of the decision taking, being able to represent reduction of costs or increases of production. The objective of this work is to investigate the spatial variability of the soil attributes physical of the soil and to relation with the attributes of the fruits quality citric, using geoestatistic techniques and the relation soil-geomorphology. The study area situated in the city of Gavião Peixoto, SP, in areas of occurrence of Red Latosol distrofic. A sampling mesh will be established, with 50 regular intervals of m prefaced a total of 333 points, in an area of 83,5 hectares (500 x 1640 m). The area will be mapped on the basis of the forms of the relief. In the intersession of the sampling mesh, the sampling unit of 220,5 m2 will be established, on the basis of the choice of nine plants of orange. The samples of the soil and plants will be collected in this unit. The central plant of citrus of the unit will be geo-referenced with DGPS equipment will be evaluated the soil attributes physical: penetration resistance of the soil, bulk density, soil porosity, saturated soil hydraulic conductivity and aggregates of stability. E will be collected 50 fruits mature, in each point for determination of the attributes of the fruits quality citric, as production, income in juice, size of the fruits, amount of total soluble solids, titillate and ratio acidity. The fruits will be collected at three different epochs. The data will be evaluated statistics by the exploratory analysis understood the average, medium, shunting line standard, coefficient of variation, coefficient of asymmetry and coefficient of kurtosis... (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SIQUEIRA, D. S.; MARQUES, JR., J.; PEREIRA, G. T. The use of landforms to predict the variability of soil and orange attributes. Geoderma, v. 155, n. 1-2, p. 55-66, FEB 15 2010. Web of Science Citations: 53.

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