Acacia senegal fallow, a tool to restore Sudano-Sahelian landscapes

Peltier Régis, Offossou Kissi, Freycon Vincent, Palou Madi Oumarou, Guibert Hervé. 2019. Acacia senegal fallow, a tool to restore Sudano-Sahelian landscapes. In : 4th World Congress on Agroforestry. Book of abstracts. Dupraz Christian (ed.), Gosme Marie (ed.), Lawson Gerry (ed.). CIRAD, INRA, World Agroforestry, Agropolis International, MUSE. Montpellier : CIRAD-INRA, Résumé, p. 135. World Congress on Agroforestry. 4, Montpellier, France, 20 Mai 2019/22 Mai 2019.

Matériel d'accompagnement : 1 poster

Résumé : Background: In the Sudanian region of North Cameroon, population growth has led to reduced fallow periods, soil fertility and trees (Peltier et al., 1993). Since 1984, CIRAD, Irad and Sodecoton have been testing techniques for planting tree legumes to restore soil fertility (Harmand et al., 2017). A 15-year-old A. senegal plot was harvested in 2011.It produced 1200 kg/ha of gum arabic for 8 years (750 €/ha) and 40 m3/ha of fuel-wood for 15 years (1100 €/ ha) (D'Andous et al., 2013). Aims: After A. senegal were harvested, we studied the evolution of chemical soil properties and the production of successive crops. Mat. & methods: On sandy ferruginous acidic soil, rainfall 1000 mm/year, the farmer planted successive crops of maize, cotton and groundnuts (2011-2013). In 2011 & 2015, the soil was analyzed (composite) on 2 plots of 12 x12 m after A. Senegal (Post=fallow = Pf) and on 2 control plots continuously cultivated (Cc). Results: Crop production was much higher for all 3 years and soil chemical properties (C, N, pH, CEC) were higher in Pf than in Cc (Table 1). Conclusion: Further studies are needed to determine for how long crop cultivation remains profitable (Dubiez et al. 2018). This will pave the way for farm and landscape management including plots planted with tree legumes, to improve biodiversity, carbon storage, wood energy production, food and cash crops of the territories, while limiting population migration and the destruction of the last Sudanese natural ecosystems.

Mots-clés Agrovoc : Acacia senegal, jachère, sécurité alimentaire, conservation des sols

Mots-clés géographiques Agrovoc : Cameroun

Mots-clés libres : Improved fallow, Acacia senegal, Cameroon, Soil fertility, Restoration

Classification Agris : K10 - Production forestière
F08 - Systèmes et modes de culture
P35 - Fertilité du sol

Auteurs et affiliations

• Peltier Régis, CIRAD-ES-UPR Forêts et sociétés (FRA) ORCID: 0000-0002-8110-7322
• Offossou Kissi, OIPR (CIV)
• Freycon Vincent, CIRAD-ES-UPR Forêts et sociétés (FRA)
• Palou Madi Oumarou, IRAD (CMR)
• Guibert Hervé, CIRAD-PERSYST-UPR AIDA (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/592716/)

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