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Activités biologiques et dynamique de la matière organique du sol sous systèmes de culture en semis direct sur couverture végétale (Hauts plateaux de Madagascar)

Abstract : The objective of this study was to investigate the impact of soil management on soil biofunctioning in the highlands of Madagascar. Direct seeding Mulch-based Cropping systems (DMC) were compared to conventional tillage (CT) and the natural fallow (NF) on the rate of decomposition and mineralization of residues as well as on the abundance, biomass and activity of litter- and soilmicroorganisms and macrofauna. Long term experimentation was used in Bemasoandro and Andranomanelatra. Contrasted cropping systems were studied, DMC on crop residues and on living mulches, CT and the NF. Results showed that the NF soil had the highest C and N content, however DMCs increased microbial biomass, soil respiration and nutrient cycling except for urease activity which was very high in NF (P<0.05). Depending on biochemical quality of the inputs, the dynamics of OM is different in the different systems. Management influenced macrofauna density and biomass. This study shows that the CT was detrimental to soil biological quality. DMC is a good soil management alternative but its effects on soil biofonctions depend on the choice of crops, crop association or rotation and the quality and quantity of OM added to soil which regulating major soil processes and functions.
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http://hal.cirad.fr/cirad-00764450
Contributor : Mahafaka Karen Ranoarisoa <>
Submitted on : Thursday, December 13, 2012 - 9:35:47 AM
Last modification on : Wednesday, July 8, 2020 - 5:24:03 PM

Identifiers

  • HAL Id : cirad-00764450, version 1
  • PRODINRA : 316382

Citation

B. Rabary, E. Blanchart, Z. Andriamanantena, C. Hervouet, J.-M. Douzet, et al.. Activités biologiques et dynamique de la matière organique du sol sous systèmes de culture en semis direct sur couverture végétale (Hauts plateaux de Madagascar). Terre malgache, 2008, 26, pp.29-33. ⟨cirad-00764450⟩

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