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Title: An Eco-Physiological Study of Cultivated Barleys in Welmera
???metadata.dc.contributor.*???: Dr. Tewolde Berhan G/Egziabher
Asfaw, Zemede
Issue Date: Jul-1980
Publisher: Addis Ababa University
Abstract: In eco-physiological studies, problems that originate from field observations are tackled both through field work and laboratory studies. This paper presents a study made on the eco-physiology of barley (Hordeum Sect. Cerealia lends„) cultivars cultivated in Welmeral Shoa. Field studies, i.e. observations, discussions with farmers, seed,. plant and soil sample collections and laboratory experiments and analyses, i.e. pot experiments in the greenhouse on 9 barley cultivars each cultivar planted in the 9 soils from the areas where the cultivars were collected and mechanical and chemical analyses of the soils were carried out in the years 1979 and 1980. The data gathered were subjected to various statistical treatments. The results showed that there are wide differences both among the 9 soils and among the 8 cultivars of barley which were successfully grown. One cultivar failed because of poor germination. The differences observed among the soils were both physical and chemical, some being more fertile and hence more suitable for most cultivars while a few were extremely poor and unsuitable for most cultivars except those that appeared to be specially adapted. The barley cultivars studied showed wide differences in their responses to these soils and their distribution within Welmera appeared to be largely a result of the differences in edaphic factor's. Soil physical conditions, level of the available forms of cationic nutrients and some important anions, eg. phosphorus, and toxic heavy metals appeared to have stronger impact on the performances of barley cultivars than other factors. The climatic and the socio-economic factors also seem to have some role, but of a smaller magnitude, in determining cultivar distribution within the area studied.. The soils based on their fertility in decreasing order were Foetal North of HolettaL Suba Road, Berfeta 2, Welmera Choke, Wachacha 2 Wachacha 1 Bedi and Berfeta 1. Several specific hypotheses were generated and the need for further studies shown: - Baleme requires a soil low in clay and high in calcium carbonate/ Kesele requires a soil with low clay and high sand contents, Netch Gebs is sensitive to heavy metal toxicityt Semereta is sensitive to both physical, requiring soils with clay content greater than about 26%, and chemical conditions of soils, i.e. it is an indicates of overall fertility of soils, Enat Netch Gebs requires soils with high proportion of exchangeable magnesium to exchangeable calcium, Keye Gebs requires soils that are rich in nutrients, Mouga requires soils that are well drained and rich in nutrients and Senef-Kollo requires soils with high exchangeable cations particularly exchangeable calcium and magnesium.
Description: A Thesis Submitted to School of Graduate Studies in Partial Fulfillment for the Degree of Master of Science in Biology
Appears in Collections:Thesis - Biology

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