Comparison of total nitrogen methods applied for histosols and soil horizons with high organic matter content.

摘要

This study was carried out to correlate total nitrogen analysed by two different methods: Kjeldahl (wet oxidation) and Perkin-Elmer 2.400 Series II-CHN Mode (dry oxidation or combustion) in Histosols and soil surface horizons with high organic matter content, sampled in different regions of Brazil (Distrito Federal, Espirito Santo, Minas Gerais, Mato Grosso do Sul, Parana, Rio de Janeiro, Rio Grande do Sul, and Sao Paulo). A positive correlation (r=0.95**) was verified between the methods, showing that Kjeldahl, because of its simplicity, can be used to routinely determine total nitrogen content in the evaluated soils..