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Resistencia a penetraçao de um latossolo vermelho amarelo do cerrado sob diferentes sistemas de manejo

Ralisch R., Miranda T.M., Okumura R.S., Barbosa G.M.D.C., Guimarães M.D.F., Scopel E., Balbino L.C.. 2008. Revista Brasileira de Engenharia Agrícola e Ambiental, 12 (4) : p. 381-384.

The intensification of agricultural production systems has caused soil compaction even when soil conservation technologies are adopted. Soil compaction is one of the main problems for farmers, both in no-tillage and in conventional-tillage systems, as well as in pasture. This study was conducted in Rio Verde, (State of Goias), on Red-Yellow Latosol under the following systems: no-tillage for 14 years (SD14); no-tillage for 8 years (SD8); no-tillage for 2 years (SD2); conventional tillage (CT); pasture (P) and forest (F). The soil resistance to penetration was measured by the impact penetrometer Model IAA/Planalsucar - Stolf, from soil surface to the soil depth of 0.40 m. Soil bulk density and granulometry were also determined. Conventional tillage had lower resistance to penetration at the 0-0.10 m depth, whereas SD2 had more resistance up to 0.40 m in depth. There were no significant differences below 0.15 m in depth among treatments CT, SD8, and SD14. The first two years under the no-tillage system are critical, with regard to the resistance to penetration in to the soil surface layers.

Mots-clés : compactage du sol; non-travail du sol; travail du sol conventionnel; expérimentation au champ; pénétromètre; goias

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