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Characterization of a Brazilian clayey soil submitted to conventional and no-tillage management practices using pore size distribution analysis

2010; Elsevier BV; Volume: 111; Issue: 2 Linguagem: Inglês

10.1016/j.still.2010.10.004

1879-3444

Fabio Augusto Meira Cássaro, Angelo Kuhn Borkowski, Luiz F. Pires, Jadir Aparecido Rosa, Sérgio da Costa Saab,

Clay minerals and soil interactions

In this paper is presented the use of soil water retention curves (SWRC) to investigate modifications in pore size distribution (PSD) of a Rhodic Ferralsol submitted to two different long term management practices: no-tillage (NT) and conventional tillage (CT). Soils from both treatments were investigated in 3 different depths, 0–10, 10–20, and 20–30 cm and matric potential values that varied from 0 to −780 kPa. The obtained results showed trimodal PSDs for both treatments, indicating well structured soils. The obtained results suggested that soil under conventional tillage CT and no-tillage NT: (a) first, have modified their structure depending on the treatment they were submitted; (b) second, have their macroporosity reduced to larger depths; and (c) third, have their microporosity largely altered, mainly at the surface, presenting the soil under NT a large microporosity for all investigated depths.