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Accueil du site → Doctorat → États-Unis → 1997 → Major determinants of agricultural land use in a semi-arid region : Central Tihama, Republic of Yemen

Kent State University (1997)

Major determinants of agricultural land use in a semi-arid region : Central Tihama, Republic of Yemen

Ahmed, Abdulla Mohamed

Titre : Major determinants of agricultural land use in a semi-arid region : Central Tihama, Republic of Yemen

Auteur : Ahmed, Abdulla Mohamed

Université de soutenance  : Kent State University

Grade : Doctor of Philosophy (PhD) 1997

Résumé
This study has attempted to examine agricultural land use for crop production in Central Tihama, Republic of Yemen. Tihama, the western coastal region, has a great potential for agricultural development. The area has witnessed agricultural improvement from the 1970s in increased cultivated land, increased withdrawal of groundwater for irrigation, adoption of new varieties of crops, and usage of machines and chemical fertilizers. Attempt has been made to examine if locational and behavioral models are useful in interpreting the spatial distribution of crops in the area. The study was based on a survey conducted by the researcher on a representative sample (n = 178) of farmers in 1993 and archival data, particularly collected from Tihama Development Authority and US Agency for International Development. The study shows that farmers’ decisions are influenced by many human and physical factors. However, economic and social factors are the most important ones affecting farmers’ decision making regardless of environment. Extension services, as part of the government policy, have major influence on increasing crop yield. Introduction of pumps to lift groundwater has enabled some farmers to cultivate their land twice per year. Now more than 50% of cultivated land depends on groundwater. Unfortunately, the excessive groundwater withdrawal may result in new problems such as salinity, and a dropping water table. A number of farmers have noticed dropping water levels in their wells or increased salinity in their cultivated lands. Crop distribution around urban areas matches in some respects Von Thunen’s assumptions of crop zonation. Vegetables and cash crops decrease with increasing distance from small cities, such as Al-Qatay, Ad-Dahi, and Al-Marawiah. While grain increases with increasing distance around Al-Qatay Bajil, and AZ Zaydiah. The findings have more agreement with Doherty’s model which emphasizes that farmers’ behavior is a response to different social and environmental factors. Although human factors have played a great role to change the agricultural landscape of the area, physical factors are still strong not only in governing crop patterns and distribution but also the population distribution and their activities.

Mots clés : Agriculture, Geography, Social sciences, Biological sciences

Accès au document : Proquest Dissertations & Theses

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