Institute of Technology

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Subject: search.filters.subject.Furrow irrigation

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    RESPONSE OF ONION( Allium Cepa L, )TO DIFFERENT IRRIGATION LEVELS UNDER DRIP AND CONVETIONAL FURROW IRRIGATION WITH AND WITH OUT MULCH AT MELKASSA , CENTRAL RIFT VALLEY OF ETHIOPIA
    (Hawassa University, 2020-10-26) GEBEYEHU ASHEMI BIKILA
    Water is a scarce resource in Central Rift Valley of Ethiopia and is a major limiting factor for crop production. Onion is one of the major economically important vegetable crops grown under irrigation in central rift valley. The field experiment was conducted at Melkasa agricultural research center during the dry season to identify irrigation method and irrigation application level with and whithout mulch that maximizes productivity of onion per unit of water consumed and enhanced onion crop production. The experiment was carried out using split plot design inRCBD having twelve treatments with three replications.The FAO’s recommended allowable Manageable depletion level of onion is 25%. In this study 75%, 100% recommended and 125% were tested. The experiment consisted of two irrigation methods viz.,furrow irrigation and drip irrigation as main plot and three levels of Manageable allowable depletion viz., 125%, 100% and 75% with and whith out mulch as sub-plot.The analysis of variance revealed that irrigation methods and management allowed depletion levels had a significant (p<0.01 and p<0.05) effect on onion vegetative parameters like plant height, leaf height and yield parameters like bulb diameter, bulb height, total bulb yield, marketable bulb yield, and water productivity. The highest and lowest onion vegetative and yield parameters were obtained from drip irrigation and furrow irrigation method, respectively. Moreover, the highest and lowest onion vegetative and yield parameters were obtained from drip irrigation under 75% MAD with mulch and furrow irrigation under125% MAD without mulch, respectively. Further, their interaction had a significant effect on total bulb yield and water productivity. Nonetheless, they had no significant effect on number of leaves per plant, plant height, leaf height, bulb diameter, marketable bulb yield and bulb height.The maximum total bulb yield (37.1 ton/ha), marketable bulb yield (33.1 ton/ha), bulb diameter (5.6 cm), crop water use efficiency (0.78 kg/m3 )and irrigation water use efficiency, (0.60 kg/m3 ) were observed from drip irrigation method at 75% MAD with mulch application, while significantly lower as (30.5 ton/ha), (26.7 ton/ha), (5.0 cm), (0.53 kg/m3 )and (0.40 kg/m3 ) respectively were recorded from furrow irrigation method at 125% MAD with out mulch application. Generally, drip irrigation was working efficiently according to its design and economically acceptable. Among all tested treatments drip irrigation method under 75% MAD with mulch was the best practice because of its high yield and water productivity
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    PERFORMANCE EVALUATION OF FURROW IRRIGATION IN BELLES SUGAR DEVELOPMENT PROJECT SUGARCANE FARM LEVEL, ETHIOPIA
    (Hawassa University, 2017-08-12) ADUGNAW ASEFAW NIGATU
    Evaluation of farm irrigation system plays a fundamental role in improving surface irrigation and in providing information used to advice irrigators how to improve their system operation. Furrow irrigation is one of the common methods of applying water to sugarcane at Belles sugar development project Sugarcane Plantation. The plantation is facing problems with respect to irrigation water management. This study was initiated with the objectives of evaluating the performance of furrow irrigation system at a farm level. To evaluate the performance of furrow irrigation system, a soil laboratory and field measurements (field layout, furrow geometry, time of cutoff, discharge) are made. The soil infiltration parameters „a‟, „k‟ and „fo‟ for each irrigation event are determined based on a two point approximation to volume balance method that incorporated modified Kostiakove Lewis infiltration function. Statically comparison of models outcome found the Win SRFR simulated model values provides good fitter than the SIRMOD simulation values to the estimated values. The analyses of the performance of the furrow irrigation in terms of application efficiency (Ea), distribution efficiency (Du), storage efficiency tail water Ratio (TWR), and Deep Percolation (DP) were done and found to be, the average application efficiency 62.1%, 65.3% and 68.5% for SIRMOD, estimated and WinSRFR simulated values; distribution efficiency 90.4%, 92.4% and 95.5% for estimated, SIRMOD and WinSRFR simulated value; storage efficiency 24.1%, 26.4% and 32.8% for SIRMOD, WinSRFR simulated and estimated values; TWR 31.2%, 34.2% and 37.9% for WinSRFR, estimated and SIRMOD simulated values, respectively and deep percolation ratio for all estimation is null. From the sensitivity analysis furrow slopes are higher sensitive than other parameters on influencing the application efficiency. The effects of furrow lengths are highly influencing on TWR. The effect of discharge influence on the storage efficiency also high with compared to others whereas the time of cutoff found affect the distribution efficiency.