RESUMOO objetivo do trabalho foi avaliar a atividade microbiana de solos, pela quantificação do número de bactérias aeróbicas, respiração, extração de DNA e atividade enzimática (desidrogenase). As amostras de solo foram coletadas aleatoriamente dentro de áreas agrícolas do Campus II da Universidade do Oeste Paulista, sendo elas: horta, viveiro de plantas, mata reflorestada, áreas de cultivos de milho, café, cana-de-açúcar e citros. Foram coletadas três sub amostras de cada local na camada de 0-20cm do solo. A realização das análises microbianas foram conduzidas em laboratório da própria Universidade. Os resultados mostraram que o solo oriundo da horta e do viveiro obtiveram os melhores desempenhos comparados com as áreas cultivadas com cana-deaçúcar e citros. No entanto o solo da mata, de cultivos de milho e café obtiveram valores intermediários. Os indicadores microbianos encontrados na horta e no viveiro sugerem que nesses locais houve melhores práticas de manejo do solo. Palavras-chave: Microbiologia, Desidrogenase, DNA, Respiração e Solo. MICROBIAL ACTIVITY IN SANDY SOILS, UNDER DIFFERENT AGRICULTURAL MANAGEMENT ABSTRACTThe objective of this study was to evaluate the microbial activity of soils by quantifying the number of aerobic bacteria, respiration, DNA extraction and enzymatic activity (dehydrogenase). Soil samples were randomly collected within the agricultural areas of Campus II at Universidade do Oeste Paulista. These were: vegetable garden, plant nursery, reforested forest, maize, coffee, sugarcane and citrus growing areas. Three sub samples of each site were collected in the 0-20cm layer of the soil. The microbial analyzes were carried out in the laboratory of the University. The results showed that the soil from the garden and the nursery had the best performance compared to the areas cultivated with sugarcane and citrus. However, the soil of the forest, corn and coffee plantations obtained intermediate values. The microbial indicators found in the orchard and in the nursery suggest that in these places there were better practices of soil management.
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