Indicadores químicos de qualidade da matéria orgânica de solo da sub-bacia do Rio das Mortes sob manejos diferenciais de cafeeiro Chemical indicators of the quality of organic matter of soil from the Rio das Mortes watershed under different coffee plant managements

• Main Authors: Antônio Claret Oliveira Júnior, Carlos Alberto Silva, Nilton Curi, Luiz Roberto Guimarães Guilherme, Otacílio José Passos Rangel
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2008-01-01
• Series: Química Nova
• Subjects: light fraction; humic substances; stratification ratio
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422008000700026
• ISSN: 0100-4042; 1678-7064

<abstract language="eng">This work evaluated the chemical quality of organic matter (OM) of a Brazilian Oxisol cultivated with coffee plants, under organic and conventional managements. Total organic C (TOC), light fraction C (LF-C) and C in humic (HA-C) and fulvic (FA-C) acids fractions was measured. Amongst the evaluated indexes, TOC and LF-C discriminated better OM attributes as a function of management. The stratification ratio (TOC5-10cm/TOC10-20cm) did not show differences between the systems studied. The organic system can contribute to the sustainability of coffee plantations in Brazil, because it maintains the chemical attributes of OM closer to the indexes verified under forest conditions.