Abstract
The objective of this study was to verify the influence of agroecological handling in the distribution of stable aggregates in water and in the levels of aggregate organic carbon under different vegetable covers. Five areas were selected: agroflorestal system; fig cultivation (Ficus carica L.); passion fruit (Passiflora edulis S.) and Desmodium sp. consortium; bean cultivation (Phaseolus vulgaris L), under conventional system; and corn (Zea mays), in no-tillage system. In each area, undisturbed samples were collected, in 0-5 and 5-10 cm depths, and water aggregate distribution and organic carbon of aggregate (OCAGR) were quantified. The highest aggregate mass was observed in the 2.00 mm aggregate class, in both depths, except for the bean cultivation area. In both depths, the class with greater diameter showed the highest OCAGR values for the area of passion fruit – Desmodium sp. consortium.
Highlights
Vários trabalhos desenvolvidos nas zonas intertropicais têm demonstrado o importante papel desempenhado pela matéria orgânica das camadas superficiais, principalmente sobre as propriedades edáficas que influenciam a fertilidade do solo (MOREAU, 1983; LEPSCH et al, 1994; FELLER et al, 1996; PINHEIRO et al, 2004; MERCANTE et al, 2008)
organic carbon distribution influenced by agroecological handling
The objective of this study was to verify the influence of agroecological handling in the distribution
Summary
O estudo foi realizado na área do Sistema Integrado de Produção Agroecológica - SIPA, denominado ‘Fazendinha Agroecológica do km 47’. As coberturas vegetais com figo, milho e feijão receberam uma adubação com cama de aviário no momento do plantio e depois, outra em cobertura, de acordo com as recomendações de cada cultura. A distribuição dos agregados, por classes de diâmetro médio (de 8,0 ≥ X > 2,0 cm, de 2,0 ≥ X > 1,0 cm, de 1,0 ≥ X > 0,5 cm, de 0,5 ≥ X > 0,25 cm e de 0,25 ≥ X > 0,105 cm), foi obtida submetendo-se as amostras de solo ao peneiramento via úmida (EMBRAPA, 1997). Adicionaram-se 10 mL de dicromato de potássio 0,2 mol L-1 em meio sulfúrico, em cada amostra, que foi aquecida a 150°C em placa aquecedora até oxidação da matéria orgânica do solo. Os resultados obtidos foram submetidos à análise de variância com aplicação do teste F e os valores médios comparados entre si pelo teste de ScottKnott a 5%
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