Impacto del tipo de uso de la tierra sobre propiedades del suelo en la depresión de Quíbor

in order to evaluate the effects on land use on soils chemical, physical and biological parameters of chaimare and quibor soils series of lara state, altered, no-altered and rizhospheric soils samples were collected in some land use such as: tut-avocado, tut onion (conventional management), tut-pawpaw, tut-coriander, and tut sweet maize under organic fertilizer and tut- onion (under organic fertilizer). chemical and physical properties were evaluated in all land uses to determined relationship between soil quality with the abundance of free-living organisms with the potential to fix atmospheric nitrogen (flfn) and solubilize phosphorus (sp). results showed that the number of colonies flfn and sp was greater in the quibor series where they predominate and management with organic fertilizer in comparison to the chaimare series, also the type of land management affected most to the flfn that the sp, since that the number of colonies and selected strain were always greater for this type of bacteria in all land uses. the uses with organic fertilizer (sweet maize, pawpaw and onion), showed better soil physical conditions, and organic matter increase, were those that presented higher number of flfn and sp