A FIRST GUIDE TO THE AGRICULTURAL INSECT PESTS OF THE YEMEN ARAB REPUBLIC AND THEIR MANAGEMENT.
AuthorAl-Humiari, Amin Abdulla.
KeywordsAgricultural pests -- Yemen.
Pests -- Integrated control -- Yemen.
Insect pests -- Control -- Yemen.
Insect pests -- Yemen.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Degree ProgramGraduate College
Degree GrantorUniversity of Arizona
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Hydrology and ground water potential of the Tihama-Yemen Arab RepublicAl-Eryani, Mohamed L. (Mohamed Lotf); Evans, Daniel D. (The University of Arizona., 1979)Tihama is Yemen's coastal strip of land bordering the Red Sea. It occupies an area of about 20,000 km² and represents the country's most promising agronomic resource. With a total median annual volume of about 1,000 MCM (million cubic meters), surface water enters the Tihama plain through seven major wadis that drain the mountainous catchments to the east. The Tihama's Quaternary section constitutes the region's only known ground water aquifer. It consists of a thick sequence of alluvial sediments. Ground water occurs under water table conditions, and is annually replenished primarily by seepage of surface runoff. Using the technique of flow net analysis, it was found that annual natural ground water discharge through the Tihama aquifer to the Red Sea amounts to about 300 MCM. A confirmation of this magnitude of discharge was possible by computing two water balances at two of the major wadis. Results of the discharge computations can be applied in the planning of future salvage of this non-beneficial loss. Given that the current system of surface and ground water irrigation in the Tihama supports an area of about 150,000 hectares, a recovery of as little as 50 percent of this loss can increase the irrigated area by an additional 15,000 hectares.
Energy consumption in Yemen: Economics and policy (1970-1990)Harris, DeVerle P.; Dahan, Abdulkarim Ali, 1962- (The University of Arizona., 1996)This dissertation examines the consumption of commercial energy, electricity and petroleum products in Yemen for the period 1970-1990. The main objectives are: (1) analyzing the energy consumption in Yemen; (2) investigating the determinants of demand for electricity and petroleum products (3) projecting the values of petroleum consumption for the years 1991-2000; and (4) recommending measures to curb the rate of increase in the demand for energy and to reduce the dependence upon imported oil. This study found that economic growth in Yemen has had a major impact upon the demand for electricity and petroleum products, and that energy intensity had increased over time, indicating that economic growth of Yemen has been very energy intensive. The models that have been chosen in this study are based on the theory of demand. According to this theory, the demand for a good is a function of own price, price of substitutes, and income. The estimates given by the model for aggregate electricity over the period 1975-1990 improved when the number of customers was included in the demand equation. Income and the number of customers are the major determinants of electricity demand in Yemen; the estimated coefficient for price of electricity over the period was not statistically significant at the 5% level. In the case of the demand for electricity by sectors, the results are more useful than for aggregate electricity demand. Electricity consumption for the residential, commercial and industrial sectors was well modeled as a function of only price and income. Demand for electricity in the agricultural sector, however, was described best by a stock adjustment model. The estimated models for individual petroleum products showed that price for fuels and income are major determinants in explaining the variation in demand for these products. Overall, this study found that the future energy outlook in Yemen calls for increasing electricity and petroleum consumption. Moreover, current fuel efficiencies and the estimated fuel demand equations indicate increasing fuel prices, given growth rates of population and per capita GDP. Thus, issues to be considered by energy policy include welfare and economic growth implications of increasing fuel prices, energy conservation, and expanded domestic petroleum production.