SOIL ATTRIBUTES IN DIFFERENTIAL SOIL USE AND MANAGEMENT SYSTEMS

Abstract

Different land use systems have been proposed and implemented in the central-west region of Brazil. These new techniques guarantee the recovery of degraded areas and the potentialization use them, and for this reason they have become increasingly frequent, which requires technical knowledge to confirm their viability. The objective of this work was to evaluate the chemical and microbiological attributes an area on Red-Yellow Dystrophic Latosol with three crop-livestock-forest integration systems and to compare them with a pasture and native forest area, in two evaluation years. The collections were carried out at a technological reference unit of Embrapa Agrossilvipastoril, in the north of Mato Grosso state. Soil microbiological analyzes were carried out with fumigation-incubation method for microbial biomass carbon determination and its derivatives; serial dilution and incubation in a selective medium for microorganisms cultivable enumeration; incubation in selective substrate and spectrophotometer reading for enzymatic activities; the chemical-physical characteristics followed conventional methodologies of soil analysis. The results indicated that microbiological activities are altered according to the collection period, where the first year presented the highest results for most of variables. The correlation between all variables, collections and management, identified that the total fungi are responsible for the activity of most enzymes, in addition to being influenced by chemical variables: potential acidity, organic matter and cation exchange capacity. The correlation within each year of evaluation showed the enzymes dynamics with respect to the magnesium attribute. It is concluded that there was a greater variation in relation to the harvesting period than in relation to the management adopted. In addition, the chemical condition has a direct correlation with the presence of total fungi and soil enzyme activity.