Anais do XXXIV Congresso Brasileiro de Ciência do Solo

TILLAGE AND RESIDUE MULCH ON PHYSICO-HYDRIC PROPERTIES OF AN ALFISOL CULTIVATED FOR SUGARCANE IN SOUTHERN BRASIL.

GABRIEL OLADELE⁽²⁾; JOSÉ MIGUEL REICHERT⁽²⁾; ERACILDA FONTANELA⁽¹⁾; ALAN EBANO OLIVEIRA⁽²⁾;
1 - TÉCNICO E TECNOLÓGICO DO INSTITUTO FEDERAL DE EDUCAÇÃO, CIÊNCIA E TECNOLOGIA DO RIO GRANDE DO SUL - CÂMPUS IBIRUBA; 2 - UNIVERSIDADE FEDERAL DE SANTA MARIA, BAIRRO CAMOBI;

Tillage and residue mulch were evaluated on physico-hydric properties of an Alfisol cultivated for sugarcane. The experiment was a randomized complete block design with split-plot arrangement. No-tillage (NT); no-tillage + compaction (NTC); conventional tillage (CT); chiseling (Chi) were the main blocks, with and without residue cover as sub-plots, in three replicates. Soil samples were collected from soil layers, 0-10, 10-20, 20-40 and 40-60 cm for physico-hydraulic properties. Infiltration tests were performed using double ring infiltrometers. NTC had the highest bulk density and least total porosity, macroporosity, saturated hydraulic conductivity and microporosity. In the 0-20 cm layer, BD reduced while Pt, Ma and Ksat increased due to residue mulch. Infiltration was higher in tilled treatments while it was lower in mulched plots. The improved soil surface structure is an indication of crop residue retention as a strategy for mitigating soil degradation.

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