Two techniques were compared that uses the UV absorbance at 280nm of 0.5mol/L K_2SO_4 extracts of fumigated and unfumigated soils and fumigationwaterlogged incubation to estimate the concentrations of nitrogen in the SMB.Using 20 Ningxia and Shaanxi soils,with a wide range of organic carbon(5.16~24.6g/kg), total nitrogen(0.75~2.66 g/kg) and available nitrogen(25.7~119.0 mg/kg),it was demonstrated that the increase in UV absorbance at 280nm after soil fumigation was strongly correlated with the soil microbia...
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