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Soil carbon storage and physical protection according to tillage and soil cover practices (Antsirabe, Madagascar)

Razafimbelo-Andriamifidy Tantely, Albrecht Alain, Feller Christian, Michellon Roger, Moussa Narcisse, Muller Bertrand, Oliver Robert, Razanamparany Célestin. 2006. Soil carbon storage and physical protection according to tillage and soil cover practices (Antsirabe, Madagascar). In : Voly rakotra. Mise au point, évaluation et diffusion des techniques agro-écologiques à Madagascar : articles et posters présentés au troisième congrès mondial de conservation Nairobi, Kenya, octobre 2005. Husson Olivier (ed.), Rakotondramanana (ed.). FAO. Antananarivo : GSDM, pp. 39-43. Congrès mondial d'agriculture de conservation. 3, Nairobi, Kenya, 3 October 2005/7 October 2005.

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Titre français : Stockage et protection physique du carbone en fonction des pratiques de culture et de couverture du sol (Antsirabe, Madagascar)

Abstract : Direct seeding on permanent soil cover (DSPSC) systems can produce a large amount of residues to improve crop yields and soil properties, such as soil organic carbon (SOC) storage and soil aggregation. A long-term (11 years) trial, located in Antsirabe (subtropical climate, 16°C, 1300 mm.y-1) on a clayey andic dystrustept, has been used in order to study SOC storage, soil aggregate stability and SOC physical protection against microbial mineralization. The treatments were: (i) control (CT): annual rotation of maize (Zea mays L.) and soybean (Glycine max) with conventional tillage (hand ploughing), (ii) the same rotation with no tillage (NTm), (iii) a maize/maize rotation with legume (Desmodium uncinatum) permanent cover crop, and no-tillage (NTd), (iv) and a common bean (Phaseolus vulgaris)/soybean rotation with kikuyu grass (Pennisetum clandestinum) permanent cover crop, and no-tillage (NTk). No residues were exported in DSPSC systems and they were removed for CT system. Soil C content was significantly greater in NTm, NTd and NTk than in CT for only the 0-5 cm layer. Storage of organic soil C (in equivalent soil mass of 0-20 cm layer) was significantly greater in NTd and NTm than in NTk and CT. The annual rate of soil C storage for NTm and NTd were respectively 0.69 and 1.01 Mg C.ha-1 year-1. Water-stable macroaggregates (200-2000 [mu]m) were significantly greater in NTm, NTk and NTd than in CT at 0-5 and 5-10 cm layers. Macroaggregates were significantly correlated with soil C content. However, the C physically protected from mineralization was only about 50 and 200 [mu]gC g-1 soil in CT and NTm respectively, and not significantly between these two systems. The results showed that the tested systems, through the increase of organic inputs and the decrease of C loss, can significantly increase SOC stocks and soil aggregate stability. The stored C was physically protected against microbial mineralization by its localization into macroaggregates but at a low level. Thus, the stored C in DSPSC systems might be physico-chemically or chemically protected. (Résumé d'auteur)

Mots-clés Agrovoc : Fertilité du sol, Non-travail du sol, Semis direct, Matière organique du sol, Structure du sol, Minéralisation

Mots-clés géographiques Agrovoc : Madagascar

Classification Agris : P35 - Soil fertility
P36 - Soil erosion, conservation and reclamation
F07 - Soil cultivation

Auteurs et affiliations

  • Razafimbelo-Andriamifidy Tantely, IRD (FRA)
  • Albrecht Alain, IRD (FRA)
  • Feller Christian, IRD (FRA)
  • Michellon Roger, CIRAD-CA-UPR Couverts permanents (MDG)
  • Moussa Narcisse, TAFA (MDG)
  • Muller Bertrand, CIRAD-AMIS-UPR Modélisation intégrative (SEN)
  • Oliver Robert, CIRAD-CA-UPR Recyclage et risque (FRA)
  • Razanamparany Célestin, TAFA (MDG)

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/529658/)

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