Fuente: Wipo "precision farming" This invention particularly relates to an apparatus and operational methodology of a contacttype, tractor mounted soil conductivity mapper used in soil characterization for precisionfarming applications.The system is capable of recording bulk soil electrical conductivity using suitablecombination of electrodes that are switched in the desired array configurations, and thelogged data of spatial variations at different sub-surface soil regions can further be used tointerprer nutrient levei intormation within a specific. referenced area mapped by globalpositioning system. The system is useful in characterizing soil and in-turn enables: yieldpotential assessment, directing sampling cores, and determining site-specific variableapplication rates of soil input manures including: fertilizers and irrigation. Principle of Multiple-array configurations is employed through switching matrix for investigating lateraland vertical .soil profiling information, leading to high resolution sub-surface spatialvariability mapping in terms of bulk electrical conductivity having multitude of PFapplications.