Browsing PhD Dissertations by Issue Date

Now showing items 1-20 of 365

Manipulation of flowering for seed production of shallot (.Allium cepu L. var. ascalonicum Backer)

Tabor, Getachew (University Hannover, 1969)

Shallot (Alliaceae: Allium cepa var. ascalonicum Backer; is the most important subgroup of the Aggregation! group and die only one grown commercially. However, it is mainly propagated vegetatively by bulbs which requires ...
AGRICULTURAL COMPARATIVE ADVANTAGE UNDER UNCERTAINTY THE CASE OF SENEGAL

Cathy, Jabara Lynn (Purdue University, 1979)

The traditional theory of comparative advantage demonstrates that if every country specialized in the production and export of commodities in which it is the relatively least cost producer in exchange for commodities ...
THE BIOLOGY AND CONTROL OF RED TEF WORM Mentaxya ignicollis (Walker) (LEPIDOPTERA: NOCTUIDAE) IN ETHIOPIA

GEBREMEDHIN, TADESSE (University of London, 1986)

The life cycle of red tef worm, Mentaxya ignicollis (Walker) was studied at Holetta, Ethiopia. In the laboratory an average of over 1000 eggs were laid by each female. The larval period with six instars extended over a ...
Control of Slriga gesnarioides damage on cowpea

James, Alexander , Irvine (University College London, 1986)

Low input agriculture, immediately relevant to poor countries, is a necessary aim worldwide. A root parasitic weed, S.gesnerioides, is causing increasing yield loss from cowpeas grown in Africa. Trials were conducted to ...
Studies on the meat production potential of some local strains of chickens in Ethiopia

Forssido, Teketel (University of Giessen, 1986)

Ethiopia is a highland country, covering approximately 1.2 million km with nearly 75 percent of the land surface at more than 500 m above sea level. The country lies near the equator in a zone where the maximum heat of ...
AN AGRICULTURAL SECTOR MODEL FOR THE NORTHERN REGION OF SUDAN TO EVALUATE NEW FABA BEANS TECHNOLOGIES

Taha, Abdelmoneim (Purdue University, 1988)

Faba beans are considered one of the major food crops in the Sudan. Recently real prices have been rising, suggesting that demand for them has been increasing faster than supply. This implies a need for production improvement ...
Ecology and management of maize stalk borer, Busseola fusca (Fuller) (Lepidoptera:Noctuidae) in southern Ethiopia

Gebre-Amlak, Assefa (Swedish University of Agricultural Sciences, 1988)

In an attempt to develop integrated management methods for the maize stalk borer, Busseola fusca in Ethiopia, its ecology and non-insecticide management techniques were studied. B. fusca has three generations per year ...
DIALLEL ANALYSIS OF RESISTANCE TO CHOCOLATE SPOT DISEASE (BOTRYTIS FABAE SARD.) AND OTHER AGRONOMIC TRAITS IN FABA BEAN (VICIA FABA L.)

MOHAMED, MOUNIR (Cairo University, 1988)

Faba bean ranks first among the food legume crops grown in Egypt for human consumption. It \S A.n important food crop being consumed both in the green succulent state and as dry edible seeds. The average cultivated ...
BARLEY OF ETHIOPIA: A FOCUS ON THE INFRASPECIFIC TAXA

ZEMEDE, ASFAW (UPPSALA UNIVERSITY, 1989)

Ethiopia has a large number of botanical forms of cultivated barley {Hordeum vulgare L.). This study deals with the variation in spike morphology, hordein polypeptide pattern and provenance of the various forms. Some ...
ANIMAL TRACTION ON SMALLHOLDER FARMS IN THE ETHIOPIAN HIGHLANDS

Goe, Roderick Michael (Cornell University, 1989)

The failure of tractorization programs to achieve projected increases in agricultural production in developing countries has created a renewed interest in the utilization of animals as a source of power on smallholder ...
POTENTIALS AND POSSIBILITIES OF DOUBLE-CROPPING WHEAT AFTER COTTON UNDER IRRIGATION IN AWASH VALLEY, ETHIOPIA

Mohammed, Jamal (Justus Liebig Universitat Giessen, 1989)

Cotton which needs 170 days of the year is produced in the Awash Valley during the warm season and the land, labour, machinery and irrigation water are underutilized during the cool season at present. With the broad ...
STUDIES ON GENETIC, CULTURAL AND INSECTICIDAL CONTROLS AGAINST THE BEAN FLY, OPHIOMY1A PHASEOLI (TRYON) (DIPTERA: AGROMYZIDAE), IN ETHIOPIA

ABATE, TSEDEKE (SIMON FRASER UNIVERSITY, 1990)

The bean fly (BF), O p h i o m y i a p h a s e o l i (Tryon) (Diptera: Agromyzidae), is the major pest of haricot bean (P h a s e o i u s v u / g a r i s L.) in Ethiopia. It mines leaves upon hatching, then moves to the ...
Studies on the ecology of helminth parasites in naturally infected indigenous sheep in Awassa, Southern Ethiopia

Asegede, Gebrekiros (Justus Liebig Universitat Giessen, 1990)

Ethiopia has a population of 45 million and an area of 122.4 million hectares. Eighty-five percent of the population are farmers whose livelihood depends on agriculture. Agriculture, being a basic sector of the national ...
IDENTIFICATION OF Fusarium spp. AND MYCOTOXINS ASSOCIATED WITH HEAD BLIGHT OF WHEAT IN ETHIOPIA

BEKELE, ESHETU (University of Missouri-Columbia, 1990)

Wheat seeds produced in 1987 and stored under various conditions at research stations, seed farms, state farms and farmer fields in different regions of Ethiopia were checked for Fusarium infection. Fusarium was detected ...
Analysis of Forces Acting on Mouldboard Ploughs and Seed Drill Coulters In Relation to Speed, Depth and Soil Conditions; Static and Dynamic Studies

Gebresenbet, Girma (Swedish University of Agricultural Sciences, 1991)

Comprehensive studies on the performance of a conventional mouldboard plough were performed under field conditions in order to determine the responses of soil-engaging parts of plough components, in terms of forces, to ...
Nitrogen transformations in some Ethiopian Highland vertisols

Ali, Ali Yimer (University of Wales, 1992)

Vertisols of the Ethiopian highlands have serious waterlogging with N and/or P deficiency problems. Improving surface drainage by using the Broadbed and Furrow (BBF) technology and applying N and P fertilizers have been ...
RAPESEED OIL IN RUMINANTS DIETITS EFFECT ON RUMEN METABOLISM AND ANIMAL PERFORMANCE

TSEHAI, ALEM (University o f Helsinki,, 1992)

The effects of supplementary rapeseed oil feeding on rumen enzyme activities, in sacco degradability of plant cell wall (I), in vivo nutrient digestibility and rumen kinetics (II) were studied in bulls fitted with rumen ...
EFFET DE L'ENVIRONNEMENT CHIMIQUE SUR LE DEVELOPPEMENT DE DRECHSLERA TERES (SACC.) SHOEML, PARASITE DE L'ORGE

TOUBIA-RAHME, HALA (Paul Sabatier University, 1992)

The in vitro investigation of the effects of some active ingredients, on the different biological sequences of Drechslera teres f. maculata and f. teres in barley, showed that the treatment efficiency depended on the ...
ESTIMATION OF ADDITIVE AND NONADDITIVE GENETIC EFFECTS FOR GROWTH, MILK YIELD AND REPRODUCTION TRAITS OF CROSSBRED (Bos taurus x Bos indicus) CATTLE IN THE WET AND DRY ENVIRONMENTS IN ETHIOPIA

Kebede, Beyene (1992)

There are large differences in production between cattle in the tropics and in the temperate regions. These differences result from environmental and genetic factors as well as the interaction between them. The temperate ...
Drought Resistance in Durum Wheat

Simane, Belay (Wageningen University, 1993)

Durum wheat is widely grown as a rainfed crop in the semi-arid tropics. Its production is low and variable from season to season due to frequent drought-stress. Characterization of target environment and employing both ...

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