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Universiteit Gent (2002)

Assessment and Optimization of Traditional Irrigation of Vertisols in Northern Ethiopia : a case study at Gumselasa Microdam using Maize as an Indicator Crop

Mintesinot Behailu

Titre : Assessment and Optimization of Traditional Irrigation of Vertisols in Northern Ethiopia : a case study at Gumselasa Microdam using Maize as an Indicator Crop

Evaluatie en optimalisatie van het traditionele irrigatiesysteem van Vertisolen in noord Ethiopië studie uitgevoerd aan de Gumselasa microdam site met maïs als testgewas

Auteur : Mintesinot Behailu

Université de soutenance : Universiteit Gent

Grade : PhD Physical Land Resources 2002

Résumé
The overall goal of the current study was to look to possible technologies of irrigation water management on Vertisols so as to increase the productivity of water on these soils. To achieve this goal, a comparative study was undertaken between the traditional irrigation management and optimized technologies using maize as an indicator crop. The optimized technologies included surge/intermittent irrigation, precise/full irrigation and deficit/alternate furrow irrigation. After detailed understanding of the hydro-physical behavior of the Vertisols, a comparative field test was undertaken among the various technologies over two irrigation seasons (1998/1999 and 1999/2000). Results of the study were compared at three levels : yield-based, water productivity-based and economic productivity-based comparisons. Yield-based comparison has shown that surge irrigation management results the highest yield levels, followed by precise/full irrigation and then alternate furrow (deficit) irrigation. The traditional management gave the lowest yield levels. The yield increase (by surge management) was found to be 59% over the traditional management. Water productivity-based comparison has shown that surge management results the highest water productivity values followed by alternate furrow/deficit irrigation and then precise/full irrigation. The traditional management gave the lowest water productivity levels. The productivity increase (by surge management) was found to be 60% over the traditional management. Economic productivity-based comparison has shown that the highest economic return was obtained from surge/intermittent management, followed by precise/full irrigation, deficit/alternate furrow irrigation and lastly from traditional irrigation. The increase in income (by surge management) over the traditional management was found to be 61%. The overall conclusion is that, under the condition this study was undertaken and for agro-ecologies of similar set-up, surge/intermittent irrigation management on Vertisols is the best water management option.

Annonce

Source (Résumé) : Pedon 14 - Physical Land Resources - Universiteit Gent

Page publiée le 5 novembre 2015, mise à jour le 27 janvier 2017