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Humboldt-Universität zu Berlin (2018)

Promoting Sustainable Intensification of African Indigenous Vegetable Production in Kenya

Kurgat, Barnabas

Titre : Promoting Sustainable Intensification of African Indigenous Vegetable Production in Kenya

Auteur : Kurgat, Barnabas

Université de soutenance : Humboldt-Universität zu Berlin

Grade : Doktor rerum agriculturarum im Fach Agrarwissenschaften (Dr. rer. agr.) 2018

Résumé
African indigenous vegetables (AIVs) have recently gained greater recognition across sub-Sahara Africa (SSA) because of increased awareness on their nutrition and health benefits. This rising consumer consciousness has caused an increase in demand for consumption of AIVs, which in turn has led to increased intensification of AIV production. The aim of this thesis was therefore, to evaluate the level and underlying factors influencing the adoption of sustainable intensification practices (SIPs) (use of improved irrigation systems, integrated soil fertilisation, organic manure and AIV diversification), (2) examined the impacts of SIP adoption on farmers’ livelihoods, and (3) assessed economic performance and ecological outcomes of soil fertilisation strategies in order to recommend soil fertility management strategies which optimises production, livelihood and climate trade-offs. The results revealed that use of organic manure and AIV diversification were widely adopted across rural and peri-urban production areas while improved irrigation systems and integrated soil fertility management was rather low, and even significantly lower in rural areas than in peri-urban areas. Moreover, complementarities and substitutabilities between SIPs were also identified indicating that a change in policy affecting a single SIP might have a spill over effect on other related SIPs. The results of determinants of SIPs shows that market integration, household income and peri-urban vegetable production environments were the major drivers of adoption. In addition, adoption of SIPs significantly increases both total household and crop incomes. Furthermore, integrated soil fertility manage strategy optimises economic and environmental performance. Therefore, integrated soil fertility management is a potential pathway to sustainably intensify AIV production.

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