Crop coefficient and evaptranspiration of onion at Awash Melkassa, Central Rift Valley of Ethiopia
2009
E02414
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Title
Crop coefficient and evaptranspiration of onion at Awash Melkassa, Central Rift Valley of Ethiopia
Publication Date
2009
Call Number
E02414
Summary
Improved water management through precise crop water requirement determination is needed to improve the efficiency of water use in agricultural production. As a result, appropriate irrigation scheduling which can lead to water saving, improvements in the yield and income can be designed. In this study, three non-weighing lysimeters having dimensions of 2 m?×?1 m?×?2 m were used to determine water requirement (ETc) and crop coefficient (Kc) of onion (Bombay Red cultivar). Reference crop evapotranspiration (ETo) was determined using weather data recorded at the site. The measured ETc values were 51.3 mm, 140.5 mm, 144.8 mm, and 53.9 mm during the initial, development, mid-season and late season growth stages respectively. Crop coefficient (Kc) values, calculated as ratio of ETc to ETo, were 0.47, 0.99, and 0.46 during the initial and mid-season stages and end of late season. Furthermore, third-order polynomials were fitted well to predict the crop coefficient values as functions of growing degree-days (GDD).
Journal Citation
v.23(1):1-10, IRRIGATION AND DRAINAGE SYSTEMS
Contact Information
harvest@worldveg.org
Record Appears in
Research > Published Articles