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Universiteit Gent (2004)

Evaluation of the feasibility of low power in vegetables production in the Tunesian Sahel region

Chehaibi, Sayed

Titre : Evaluation of the feasibility of low power in vegetables production in the Tunesian Sahel region

Evaluation de la faisabilité de la petite motorisation dans le secteur maraîcher du Sahel tunisien

Auteur : Chehaibi, Sayed

Université de soutenance : Universiteit Gent

Grade : Doctor of Philosophy (PhD) 2004

Résumé
Vegetable horticulture in the Tunesian Sahel region is characterised by small enterprises. The aim of this study was to investigate different aspects of introducing small-scale, low power mechanisation in this sector. First, the possibilities and the feasibility of introducing low power machinery was investigated by means of an inquiry among vegetable growers and by establishing an overview of the equipment available on the local market. Next, soil structure was investigated for two different types of soil after tillage by means of a mouldboard plough and secondary tillage by means of a horizontal cultivator. Four traction power categories were used, namely 59, 33, 22 and 6 kW. For two different types of soil, the study on soil compaction resulting from several passages in the same track by a large tractor and a small tractor showed higher compaction for the large tractor at all depths investigated. Lowest values for the vertical penetration resistance and the apparent dry density were found for the small tractor. Finally, the performances of the low power machinery were evaluated by measuring the labour inputs and the field efficiencies of two-wheeled tractors and small tractors of several brands, carrying out several cultivation operations on small parcels of land. It was found that the two-wheeled tractors gave rise to labour inputs for scuffling and secondary tillage of between 5.4 and 18.7 hr/ha. The small machinery gave also rise to the best field efficiencies for the cultivation operations considered. In general, these efficiencies were higher than 65%

Mots clés : Agronomy, Vegetables, Applied sciences, Soil sciences, Low-power machinery, Biological sciences Social sciences, Agricultural economics, Cost-effective farming, Agricultural engineering

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Page publiée le 10 février 2015, mise à jour le 28 novembre 2018