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Institut International d’Ingénierie de l’Eau et de l’Environnement (2iE) 2015

Subsurface drainage of valley bottom irrigated rice schemes in tropical Savannah : case studies of Tiefora and Moussodougou in Burkina Faso

Keïta Amadou

Titre : Subsurface drainage of valley bottom irrigated rice schemes in tropical Savannah : case studies of Tiefora and Moussodougou in Burkina Faso

Auteur : Keïta Amadou

Etablissement de soutenance : Institut International d’Ingénierie de l’Eau et de l’Environnement (2iE)

Grade : Doctorat en Sciences et Technologies de l’Eau, de l’Energie et de l’Environnement 2015

Résumé
The contrasted global population growth with the multiplication of the constraints to developing new irrigation systems puts a special challenge upon human crop production systems that needs to be taken up. The populations in many countries in Asia, Middle East and Africa are expected to double in the coming 50 years. The experience of the green revolution in Asia – during which 70% of food production increase was provided by irrigated agriculture – shows that there is not only a need to strive to increase such crop production systems, but also to improve the production efficiency of existing ones. In fact, as a much worrying case, rice production in valley bottom irrigated lands of African Tropical Savannah is far to yield the expected amount of cereals. One of the major constraints to this production is iron toxicity subsequent to poor drainage conditions. According to Africa Rice, at least 60% of the Tropical Savannah swampy valley bottoms are affected by different degree of iron toxicity. The yield in many areas drops to zero, leaving behind millions of disappointed and impoverished farmers. Therefore, it is not surprising that there is strong research dynamic – ranging from agronomy to microbiology – that strives to propose alleviating solutions to rice iron toxicity. Because prevalent anoxic conditions in the soil combined with iron reducing bacteria development were found a basic contributing factor to iron toxicity, this research has chosen to investigate subsurface drainage potential contributions to solving this issue.

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Page publiée le 18 décembre 2016, mise à jour le 3 juillet 2017