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Comportement du sol au labour : methode d'analyse et evaluation des consequences de l'etat initial du sol sur l'etat transforme par le labour

Abstract : The effect of soil structure in the ploughed layer before ploughing was studied in field experiments, in clay loam soils with a friable behaviour. Two treatments, leading to a soil structure with small and non-adherent clods or to a massive and compacted ploughed layer before ploughing were compared. Two types of compacted soil structure were distinguished according to the date of compaction (1 wk before ploughing, 1 month before ploughing). Three tractor speeds ranging from 1-8 km/h were investigated. After presentation of the method, soil structure before ploughing was characterized according to the treatments, and the persistence of differences after ploughing was analyzed. Soil structure was characterized by a quantifiable morphological description based on mapping of the ploughed layer profile. Soil structure spatial variability after ploughing was described with statistical data analysis. It was linked to the treatments. This results show the crucial effect of initial soil structure on soil structure after ploughing. No speed effect appeared. When soil structure before ploughing was made up of small and distinctive clods, soil structure after ploughing was almost the same as initial structure with a lower density; when soil structure before ploughing was massive and compacted, the ploughed layer was characterized by decimetrical clods. Their size depended on the date of compaction.
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  • PRODINRA : 119644

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I. Coulomb, Jacques Caneill, H. Manichon. Comportement du sol au labour : methode d'analyse et evaluation des consequences de l'etat initial du sol sur l'etat transforme par le labour. Agronomie, EDP Sciences, 1993, 13 (1), pp.45-56. ⟨hal-02707298⟩

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