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Pesquisa Agropecuária Brasileira

Print version ISSN 0100-204XOn-line version ISSN 1678-3921

Abstract

FRANCHINI, Júlio Cezar; MIYAZAWA, Mario; PAVAN, Marcos Antonio  and  MALAVOLTA, Euripedes. Dynamic of ions in acid soil leached with green manure residues extracts and pure solutions of organic acids. Pesq. agropec. bras. [online]. 1999, vol.34, n.12, pp.2267-2276. ISSN 0100-204X.  http://dx.doi.org/10.1590/S0100-204X1999001200014.

The influence of green manure residues addition in the dynamic of ions in acid soils is not well known. In this study, ion mobility in a sample of the Bw horizon of an Dark-Red Latosol (Oxisol), leached with citric and succinic acid pure solutions and with aqueous residue extracts of black oats (Avena strigosa) and oil seed radish (Raphanus sativus) were evaluated in soil columns (5, 10, 20, and 40 cm long by 4 cm diameter). After the solutions and extracts passed through the soil columns, the following parameters were determined: solubles contents of Cas, Mgs, Ks, Alst (total), Also (organic), Alsm (monomeric) and dissolved organic carbon. In soil, the parameters evaluated were the exchangeable contents of Caex, Mgex, Kex, and Alex and pH (CaCl2). Citric and succinic acids increased Alst and Cas contents, respectively, resulting in decreasing exchangeable fractions of these elements in soil. Black oats extract was more effective to extract Caex and oil seed radish to extract Alex. The decrease in Caex and Alex was followed by an increase in Kex. Organic complexes formed with low molecular organic ligands and Cas and Alex were suggested to play a role in the mobility of ions in subsoils of acid soils after the addition of both crop residues extracts and pure organic acid solutions.

Keywords : organic complexes; cation mobility; calcium; aluminum.

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