Fertilization strategies based on climate information to enhance food security through improved dryland cereals production

Ganyo Komla Kyky, Muller Bertrand, Guisse Aliou, Adam Myriam. 2018. Fertilization strategies based on climate information to enhance food security through improved dryland cereals production. In : Handbook of Climate Change Resilience. W. Leal Filho (ed.). Cham : Springer Nature, 917-934. ISBN 978-3-319-93335-1

https://doi.org/10.1007/978-3-319-93336-8_90

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Résumé : Rainfall uncertainty and nutrient deﬁciency affect sorghum production in Sahel. This study aimed at (i) determining the responses (varieties*water*nitrogen) of various West-African sorghum (Sorghum bicolor L. Moench) varieties to the application of fertilizer (NPK and urea) at selected growing stages according to water regime (irrigated or not, different rainfall patterns) and (ii) simulating them to deﬁne alternative fertilization strategies. This chapter proposes alternative fertilization strategies in line with rainfall patterns. Split plot experiments with four replications were carried out in two locations (Senegal), with four improved sorghum varieties (Fadda, IS15401, Soumba and 621B). Treatments were T1, no fertilizer; T2 = 150 kg/ha of NPK (15-15-15) at emergence +50 kg/ha of urea (46%) at tillering +50 Kg/ha of urea at stem extension; T3 = half rate of T2 applied at the same stages; T4 = 150 kg/ha of NPK + 50 kg/ha of urea at stem extension +50 kg/ha of urea at heading, and T5 = half rate of T4 applied at the same stages. Plant height, leaf number, grain yield, and biomass were signiﬁ-cantly affected by the timing and rate of fertilizers. Grain yield were affected by water*nitrogen and nitrogen*variety interactions. It varied from 2111 to 261 kg/ha at “Nioro du Rip” and from 1670 to 267 kg/ha at “Sinthiou Malème”. CERES-Sorghum model overestimated late fertilizer grain yields. To achieve acceptable grain yield, fertilizers application should be managed regarding weather.

Mots-clés Agrovoc : Sorghum bicolor, fertilisation, engrais NPK, données climatiques, rendement des cultures, modèle de simulation, céréale, sécurité alimentaire

Mots-clés géographiques Agrovoc : Sénégal, Sahel

Mots-clés libres : Fertilization strategies, Climate information, Food security, Sorghum, Sahel, Modeling

Classification Agris : F04 - Fertilisation
P40 - Météorologie et climatologie
S01 - Nutrition humaine - Considérations générales

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

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