Nitrogênio da biomassa microbiana em solo de Cerrado com aplicação de fertilizante nitrogenado

摘要: The objective of this work was to evaluate the effect different nitrogen doses and soil depths on microbial biomass (NSMB) in a sandy textured Oxisol, cultivated with barley. experiment established June, 2004, an area which had been millet for three years subsequently soya beans two seasons. treatments were four (30, 60, 90 e 120 kg ha-1) control without any dose. Soil samples collected depths: 0-5, 5-10, 10-20 20-30 cm, comprising replicates sampling periods: tillering, flowering right after harvest. NSMB NSMB:Ntotal decreased according depth. Higher did not increase NSMB. Ntotal altered application nitrogen, but it There negative correlations between pH all doses, except treatment nitrogen. also positive NSMB, Ntotal.