Resumo

RAMIREZ PISCO, Ramiro; TABOADA, Miguel Angel  e  GIL, Rodolfo. LONG TERM EFFECTS OF NO TILLAGE AND CONVENTIONAL TILLAGE IN A TYPIC ARGIUDOLL OF THE ARGENTINA ROLLING PAMPA. Rev. Fac. Nac. Agron. Medellín [online]. 2006, vol.59, n.1, pp.3237-3256. ISSN 0304-2847.

No tillage is applied to an increasing proportion of silty loam argiudolls. little is known about the possible longterm evolution of soil physical properties. In Pergamino, INTA has 16 yr field trials for comparing soil behavior under longterm conventional tillage (CT) and no tillage (NT). In these treatments soil bulk density (cores), resistance (measured in the laboratory at different water contents), pore size distribution (water desorption in the tension table), saturated hydraulic conductivity, K sat (measured in the laboratory), and aggregate instability were determined. Results were compared to a nondegraded condition (a botanic reserve). Soil K sat and aggregate instability were the most sensitive parameters, which were respectively 1,41 - 0,16 mm h^-1 and 1,07 mm under CT and 23,61 - 4,61 mm h^-1 and 1,07 mm under NT. In this treatment soil recovered its original bimodal pore size distribution, which peaked in the > 100 μm and 50 - 20 μm pore size classes.

Palavras-chave : No tillage; structural regeneration; silty loam argiudolls.

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