Soil organic matter in biogenic, intermediate and physicogenic aggregates under agroecological management

ABSTRACT Agroecological management can favor the improvement of soil attributes, especially organic matter (SOM) and aggregation. The objective study was to quantify carbon contents humic oxidizable fractions SOM aggregates from different origins agroecological systems. Five experimental areas located in Integrated Production System were evaluated: AFS – Agroforestry System; C-SUN Coffee full sun; C-SHA Shaded coffee; AL-FLE Cultivation alleys Flemingia macrophylla with green beans; NT No-tillage. separated, identified, classified as their origin or formation pathways into biogenic, intermediate, physicogenic. fulvic acid (C-FAF), (C-HAF) humin (C-HUMF); (F1 F2, labile; F3 F4, recalcitrant) determined. greatest variations values observed AFS, In relation C-HUMF, highest this fraction quantified biogenic intermediate C-SUN, showed variability between systems, mainly for F1, F2 under C-SHA. system a higher proportion more humified recalcitrant when compared system. practices maids systems C-SHA, promoted improvements quality.