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Crop coefficient and evaptranspiration of onion at Awash Melkassa, Central Rift Valley of Ethiopia
Abstract 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 ($ ET_{c} $) and crop coefficient (Kc) of onion (Bombay Red cultivar). Reference crop evapotranspiration ($ ET_{o} $) was determined using weather data recorded at the site. The measured $ ET_{c} $ 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 ($ K_{c} $) values, calculated as ratio of $ ET_{c} $ to $ ET_{o} $, were 0.47, 0.99, and 0.46 during the initial and mid-season stages and end of late season. Furthermore, third-order polynomials were fitted well to predict the crop coefficient values as functions of growing degree-days (GDD).
Crop coefficient and evaptranspiration of onion at Awash Melkassa, Central Rift Valley of Ethiopia
Abstract Improved water management through precise crop water requirement determination is needed to improve the efficiency of water use in agricultural production. As a result, appropriate irrigation scheduling which can lead to water saving, improvements in the yield and income can be designed. In this study, three non-weighing lysimeters having dimensions of 2 m × 1 m × 2 m were used to determine water requirement ($ ET_{c} $) and crop coefficient (Kc) of onion (Bombay Red cultivar). Reference crop evapotranspiration ($ ET_{o} $) was determined using weather data recorded at the site. The measured $ ET_{c} $ 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 ($ K_{c} $) values, calculated as ratio of $ ET_{c} $ to $ ET_{o} $, were 0.47, 0.99, and 0.46 during the initial and mid-season stages and end of late season. Furthermore, third-order polynomials were fitted well to predict the crop coefficient values as functions of growing degree-days (GDD).
Crop coefficient and evaptranspiration of onion at Awash Melkassa, Central Rift Valley of Ethiopia
Bossie, Mengistu (author) / Tilahun, Ketema (author) / Hordofa, Tilahun (author)
2009
Article (Journal)
Electronic Resource
English
BKL:
48.00
Land- und Forstwirtschaft: Allgemeines
/
56.00$jBauwesen: Allgemeines
/
56.00
Bauwesen: Allgemeines
/
48.00$jLand- und Forstwirtschaft: Allgemeines
Crop coefficient and evaptranspiration of onion at Awash Melkassa, Central Rift Valley of Ethiopia
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