ACÚMULO DE CARBONO E FRACIONAMENTO QUÍMICO DA MATÉRIA ORGÂNICA DO SOLO EM SISTEMA DE ILP

Abstract

The oscillations in crop productivity in recent years are related to the significant interference of cropping systems in the global C cycle, promoting a decline in SOC content, due to the low straw input, which makes it necessary to constantly search for more sustainable production systems. In this context, an ICL system (2021 – 2023) was implemented, to identify the impact of protein feed supplementation (0.5%, 1.5%) of animal body weight (BW) and mineral salt, on the contribution of C and humic substances present in the soil. In the period evaluated, the ICL adoption provided an increase of 0.45 g.kg-1 in fulvic acid content and 1.55 g.kg-1 in humic acid content, with more significant changes occurring in paddocks with protein food supplementation. Regardless of feeding management, there was an increase of 14.6 t.ha-1 in the C stock in the 0.0 – 0.40m depth layer, which is equivalent to 53.7 t.ha-1 of atmospheric CO2 stabilized in the soil. All food management was effective in increasing soil carbon deposition, however, supplementation with protein-energy concentrate had a more intense effect, making it a promising management strategy when seeking sustainability and maintenance of soil quality in a short period of time.