Inorganic nitrogen, microbial biomass and microbial activity of a sandy Brazilian Cerrado soil under different land uses - Frazão, Leidivan Almeida; Piccolo, Marisa de Cassia; Feigl, Brigitte Josefine; Cerri, Carlos Clemente; Cerri, Carlos Eduardo Pellegrino (Agriculture Ecosystems & Environment, 2010)