Space distribution of the compressibility parameters of an Oxisol, under integrated agricultural systems

• Grant number: 18/13860-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2018
• End date: October 31, 2019
• Field of knowledge: Physical Sciences and Mathematics - Geosciences
• Principal Investigator: Reginaldo Barboza da Silva
• Grantee: João Pedro de Lima
• Host Institution: Universidade Estadual Paulista (UNESP). Campus de Registro. Registro , SP, Brazil

Abstract

The relationship between physical-mechanical attributes and soil structure behavior has been important in understanding the impact of different agricultural management systems. In those systems where soil transferability and workability are intense, the stress-strain relationship needs to be better investigated. The research project aims to model and spatialize the compressibility parameters, which describe the impact on the functional integrity of the structure of a dystrophic Red Latosol (LVd - oxisol), promoted by three Integrated Systems of Agricultural and Livestock Production. The research will be conducted in experimental areas of Embrapa Pecuária Sudeste, in São Carlos, SP. Three Integrated Production Systems will be studied: a) extensive grazing system, b) crop-livestock integration system and c) crop-livestock-forest integration system). The compressibility tests will be carried out on test specimens of the layer 0.0 to 0.20 m, which will be equilibrated to two degrees of consistency (friable and plastic) and subjected to seven pressure levels: 25, 50, 100 , 200, 400, 800 and 1600 kPa, thus making it possible to obtain compression (strain-deformation) curves of the soil. From the respective curves will be estimated the compressibility parameters (preconsolidation pressure, Ãp and compression index, m), which will be spatialized, thus allowing the preparation of maps of load-bearing capacity (LBC) and soil susceptibility to compaction, respectively, for each system studied. It is expected that with the results found, the spatial distribution of the compressibility parameters, as a function of the degrees of consistency and associated to the physical characterization of the soil in each system, allows to identify or not, improvements in the integrity functional structure of the LVd.