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Accueil du site → Doctorat → États-Unis → 2011 → Integrated agronomic and socioeconomic assessment of a water-saving rice crop management system in the Sahel

UNIVERSITY OF CALIFORNIA, SANTA CRUZ (2011)

Integrated agronomic and socioeconomic assessment of a water-saving rice crop management system in the Sahel

Krupnik, Timothy J.

Titre : Integrated agronomic and socioeconomic assessment of a water-saving rice crop management system in the Sahel

Auteur : Krupnik, Timothy J.

Université de soutenance : UNIVERSITY OF CALIFORNIA, SANTA CRUZ

Grade : Doctor of Philosophy (PhD) 2011

Résumé
Rice is life. Over 65% of the globe’s population consumes rice daily, and 70% of the world’s poorest one billion people depend on rice farming for their livelihoods. Recent food crises, increasing agricultural input costs and growing water scarcity underscore the need for environmentally sound rice production methods. The System of Rice Intensification (SRI) is championed as a high-yielding and water-saving rice management strategy. Promoted in 47 countries, SRI is backed by groups ranging from the World Bank to non-governmental organizations. SRI’s popularity, however, is matched by fierce controversy. While some researchers praise SRI as environmentally beneficial, others contend its advantages are grossly overstated. In response, this research evaluates SRI in the Senegal River Valley. The first chapter introduces SRI and the study environment. The second details a five-season experiment comparing SRI to Recommended Management Practices (RMP). SRI saved 16-48% the water used for continual flooding in RMP, without significant yield differences. Additive yield benefits occurred in SRI when straw incorporation was combined with inorganic fertilizer additions, though only after three seasons of application. In chapter three, we compared SRI to RMP by growing seven rice cultivars under weed-free conditions, and in competition with weeds, for two seasons, and at two locations. Weed-free yields differed little between systems. SRI used less irrigation and increased water productivity 23-79%. But in competition with weeds, SRI yielded significantly less than RMP in three of four experiments. Two promising weed-competitive cultivars were identified for use in SRI. In the final chapter, we compared RMP to SRI and Farmers’ Practices in a multi-location, farmer-managed ’ experiment. In response to farmer-identified labor and production constraints, we also worked with farmers to develop a fourth crop management treatment. The resulting system proved to be high yielding, risk reducing and profitable. SRI’s benefits include high yields, reduced irrigation requirement and improved water productivity, though in the Sahelian environment, farmers may experience difficulties implementing SRI, especially where weed pressure is high, or where farmers face labor and input constraints. Instead, the most promising results come from encouraging farmers to innovate and adapt systems to turn constraints into advantages.

Mots Clés :Agronomy, Ecology, Rice, Crop management, System of Rice Intensification, Agricultural economics Social sciences, Biological sciences, Sahel, Senegal River, Water-saving

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Page publiée le 25 mai 2012, mise à jour le 31 août 2017