Farmer participatory early-generation yield testing of sorghum in West Africa: Possibilities to optimize genetic gains for yield in farmers' fields

Rattunde H. Frederick W., Michel Sebastian, Leiser Willmar L., Piepho Hans-Peter, Diallo Chiaka, Vom Brocke Kirsten, Diallo Bocar, Haussmann Bettina I.G., Weltzien Eva. 2016. Farmer participatory early-generation yield testing of sorghum in West Africa: Possibilities to optimize genetic gains for yield in farmers' fields. Crop Science, 56 (5) : 2493-2505.

Quartile : Q2, Sujet : AGRONOMY

Résumé : The effectiveness of on-farm and/or on-station early generation yield testing was examined to maximize the genetic gains for sorghum yield under smallholder famer production conditions in West Africa. On-farm first-stage yield trials (augmented design, 150 genotypes with subsets of 50 genotypes tested per farmer) and second-stage yield trials (replicated α-lattice design, 21 test genotypes) were conducted, as well as on-station α-lattice first- and second-stage trials under contrasting phosphorous conditions. On-farm testing was effective, with yield showing significant genetic variance and acceptable heritabilities (0.56 in first- and 0.61 to 0.83 in second-stage trials). Predicted genetic gains from on-station yield trials were always less than from direct testing on-farm, although on-station trials under low-phosphorus and combined over multiple environments improved selection efficiencies. Modeling alternative designs for on-farm yield testing (augmented, farmer-as-incomplete-block, multiple lattice, and augmented p-rep) indicated that acceptable heritabilities (0.57 to 0.65) could be obtained with all designs for testing 150 progenies in 20 trials and 75 plots per farmer. Ease of implementation and risk of errors would thus be key criteria for choice of design. Integrating results from on-station and on-farm yield testing appeared beneficial as progenies selected both by on-farm and on-station first-stage trials showed higher on-farm yields in second-stage testing.

Mots-clés Agrovoc : Sorghum bicolor, amélioration des plantes, sélection, participation des agriculteurs, expérimentation au champ, rendement des cultures, gain génétique, génotype, approche participative, essai de variété, variation génétique, héritabilité, modélisation des cultures, petite exploitation agricole

Mots-clés géographiques Agrovoc : Mali, Afrique occidentale, Burkina Faso

Classification Agris : F30 - Génétique et amélioration des plantes
U30 - Méthodes de recherche
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Rattunde H. Frederick W., ICRISAT (MLI)
• Michel Sebastian, BOKU (AUT)
• Leiser Willmar L., Universität Hohenheim (DEU)
• Piepho Hans-Peter, Universität Hohenheim (DEU)
• Diallo Chiaka, IPR-IFRA (MLI)
• Vom Brocke Kirsten, CIRAD-BIOS-UMR AGAP (MDG)
• Diallo Bocar, IER (MLI)
• Haussmann Bettina I.G., Universität Hohenheim (DEU)
• Weltzien Eva, ICRISAT (MLI)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/582083/)

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