Research Achievements, Challenges and Future Perspectives of Irrigation and Water Harvesting Research Program of Jimma Agricultural Research Center: A Review
Etefa Tilahun Ashine,
Minda Tadesse Bedane
Issue:
Volume 7, Issue 1, February 2022
Pages:
1-7
Received:
25 January 2022
Accepted:
26 February 2022
Published:
9 March 2022
Abstract: Due to spatial and temporal variability, rainfall rarely meets the required amount of water for plant growth, resulting in low agricultural production. Thus, for a sustainable increase in agricultural production and productivity, the use of irrigation is essential. Since its establishment, Jimma Agricultural Research has been conducting irrigation and water harvesting research for one and half a decade and has generated essential research findings for its mandate area. The objective of this review was to document the major achievements on coffee irrigation, challenges, and future prospects of the irrigation and water harvesting research program. The study was conducted by reviewing documents available on the web, interviewing the previous researchers who conducted the study, and also reviewing documents available in the library of the Jimma Agricultural Research Center. The major research activities conducted in the Jimma Agricultural Research Center under the irrigation and water harvesting program on coffee crops were: dry matter partitioning and physiological responses of Coffee Arabica varieties to soil moisture deficit stress seedling stage in southwest Ethiopia; growth response of Hararghie coffee accessions to soil moisture stress at seedling; sensitivity of coffee genotypes to drought induced by soil drying at early growth stages; growth and plant water relations of Arabica coffee in response to deficit irrigation; determination of optimal irrigation scheduling for coffee; and estimation and mapping of coffee water requirements using models. The major challenges were the lack of irrigation infrastructure, the lack of green houses and rain shelters, and the lack of laboratory equipment. Future irrigation research will focus on climate change, salinity management, ground water monitoring, watershed-based irrigation, modelling, and the application of more advanced technologies in relation to geographical information system and remote sensing.
Abstract: Due to spatial and temporal variability, rainfall rarely meets the required amount of water for plant growth, resulting in low agricultural production. Thus, for a sustainable increase in agricultural production and productivity, the use of irrigation is essential. Since its establishment, Jimma Agricultural Research has been conducting irrigation ...
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Experimental Study of the Pressure Generated by a Linear Heat Source in a Semi–ventilated Enclosure
Kouéni-Toko Christian Anicet,
Patte-Rouland Béatrice,
Paranthoën Pierre
Issue:
Volume 7, Issue 1, February 2022
Pages:
8-15
Received:
12 February 2022
Accepted:
2 March 2022
Published:
9 March 2022
Abstract: The objective of this work is to understand and successfully control the phenomena found at the openings when the enclosure is subjected to a linear heat source. The enclosure is not adiabatic. The control and understanding of its phenomena will be carried out by differential static pressure measurements. These measurements were carried out in calm weather using a Furness control micro–manometer in 20 points at positions x+ = 0, y+ = - 0.5 and along the vertical z+. We have studied four enclosure configurations. Each configuration has two or four or six openings. The openings have identical characteristics, height h = 34 mm and width l = 210 mm. The height of the enclosure is H = 520 mm and the length is equal to the width L = l = 210 mm. We have shown the influences of the reduced Grashof number (Gr*), the number and the position of the openings on the differential static pressure with and without dimension and compared the experimental results obtained with those of cases 11 and 12 of Koueni Toko (2019). It appears that the values and forms of the static pressure and the values of the neutral height can vary according to Gr* and number and the position of the openings.
Abstract: The objective of this work is to understand and successfully control the phenomena found at the openings when the enclosure is subjected to a linear heat source. The enclosure is not adiabatic. The control and understanding of its phenomena will be carried out by differential static pressure measurements. These measurements were carried out in calm...
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