Resumo

CONTESSOTTO, Enrique Ernesto  e  BOTTA, Guido Fernando. Power and draft required by chisel plow on soils under no- tillage in the Argentinean flat Pampas. Rev. Fac. Cienc. Agrar., Univ. Nac. Cuyo [online]. 2020, vol.52, n.2, pp.102-110. ISSN 1853-8665.

No-tillage system production in Argentina requires high traffic intensities, for example, 50 to 65 Mg km^-1 ha^-1. Due to these traffic intensities, continuously and successively applied, the soils are compacted. One of the frequently utilized techniques for management of topsoil and subsoil compaction is chiseling. The objectives of this work were: a) to evaluate the effect of vertical tillage on the physical properties of a Typic Argiudol soil from northeastern Rolling Pampa Region at Argentina and b) to quantify the power required by a chisel plow working in one and two depth levels on a soil under no-tillage. Three treatments were applied: T1) control plot (unloosened soil), T2) loosened with one chisel plow pass at a 0.25m deep range, and T3) loosened with two chisel passes, the first at 0.15m and the second at 0.25m. The following variables were measured: cone Index (CI), soil water content, (SWC), tractor slip (TS) and power and draft force (PD). The main results and conclusions showed: a) The CI values on the two deep tillage treatments were statistically different (P < 0.01) from that of the control plot, up to 300 mm and b) the chisel plow working in two depth ranges (T3) could significantly increase the specific resistance and drawbar power. This means that vertical tillage carried out in two chisel passes (T3) was, from an energy point of view, less efficient than one single pass (T2).

Palavras-chave : Cone index; Soil carrying capacity; Soil compaction; Drawbar.

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