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Evolution de la structure d'un sol ferrallitique argileux de la région des Cerrados sous deux techniques de culture

De Freitas P.L., Blancaneaux P., Da Silva F.C., Lima E.M.B., Moreau Roland, Feller Christian, Fortier Michel. 1998. Evolution de la structure d'un sol ferrallitique argileux de la région des Cerrados sous deux techniques de culture. In : Congrès mondial des sciences du sol = World congress of soil science = Congreso mundial de la ciencia del suelo. AISS; AFES. Montpellier : CIRAD, pp. 1-8. Congrès Mondial de Science du Sol. 16, Montpellier, France, 20 August 1998/26 August 1998.

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Titre anglais : Soil structure evolution under two soil management systems in a clay oxisol from Cerrado region

Abstract : The sustainability of crop production in oxisols of Cerrado Region depends on the understanding of soil structural evolution processes. Modifications in soil structure were followed for 4 years allowing the comparison of two soil management systems : conventional plowing with heavy disk harrow (CCL), and zero-tillage (PDC). Structural characterization was achieved by morpho-structural analysis, allowing the identification of horizons and homogeneous pedological units (HPU). From samples taken from most representative HPUs it were performed : pH, acidity, CEC, nutrient status, bulk and particle densities, pore size distribution from pF curves, pedo-structural characteristics from soil swelling curves, organic matter status, and micromorphological observations. Morphological differences were identified between surface horizons. Under CCL, the structural state evolved to a compaction, with well developed angular blocky HPUs, high inter-aggregate cohesion and a sufficient macroporal space. Root growth and crop performance, however, were menaced by the lack of pore continuity. In PDC, results have shown an improvement in soil structure, with moderate resistance and inter-aggregate cohesion, and well developed subangular blocky HPUs. Pore space, besides being not different from compacted horizons found in CCL, have a favorable continuity. Significant gains in yields were observed in PDC, showing a better nutrient status. Benefit/cost relationship in PDC has enhanced net income, reflecting the better structural condition. Soil structure evolution studies were important to verify the improvement in soil quality and health under no-till, an alternative soil management system for sustainable crop production in Brazilian Cerrado Region. (Résumé d'auteur)

Mots-clés Agrovoc : Zea mays, Phaseolus vulgaris, Travail du sol, Ferralsol, Structure du sol, Trait morphologique du sol, Rendement des cultures

Mots-clés géographiques Agrovoc : Brésil

Mots-clés complémentaires : Cerrado, Oxisol

Classification Agris : F07 - Soil cultivation
P33 - Soil chemistry and physics

Auteurs et affiliations

  • De Freitas P.L.
  • Blancaneaux P.
  • Da Silva F.C.
  • Lima E.M.B.
  • Moreau Roland
  • Feller Christian
  • Fortier Michel, CIRAD-AMIS-AGRONOMIE (FRA)

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/390370/)

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