Advertisement

Irrigation and Drainage Systems

, Volume 23, Issue 1, pp 1–10 | Cite as

Crop coefficient and evaptranspiration of onion at Awash Melkassa, Central Rift Valley of Ethiopia

  • Mengistu Bossie
  • Ketema Tilahun
  • Tilahun Hordofa
Article

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 (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).

Keywords

Awash Melkassa Crop coefficient Ethiopia Lysimeter Onion 

References

  1. Allen RG, Pereira LS, Raes D, Smith M (1998) Crop evapotranspiration. Guidelines for computing crop water requirements. FAO Irrig. Drain. Paper No. 56. FAO, Rome, ItalyGoogle Scholar
  2. Bosch S, Currah L (2002) Agronomy of onions. In: Rabinowitch HD, Currah L (eds) Allium crop science: Recent advance. CAB international, pp 199-214Google Scholar
  3. Brewster JL (1997) Onion and Garlic. In: Wien HC (ed) The Physiology of vegetable crops. CAB international, pp 593-607Google Scholar
  4. Doorenbos J, Pruitt WO (1977) Guidelines for predicting crop water requirements. FAO Irrig. Drain. Paper No. 24. DAO, Rome, ItalyGoogle Scholar
  5. Hanson BR, May DM (2006) New crop coefficient developed for high-yield processing tomatoes. Calif Agric 60(2):95–99CrossRefGoogle Scholar
  6. Jamal MS, Sammis TW (1999) Yield based irrigated onion crop coefficients. ASAE 15(6):659–668Google Scholar
  7. Dessalegn L, Aklilu S (2003) Research experience in onion production. EARO, Addis Ababa, EthiopiaGoogle Scholar
  8. Sepaskhah AR, Andam M (2001) Crop coefficients of sesame in semi-arid region of I.R. Iran. Agricultural Water Management 49:51–63CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Mengistu Bossie
    • 1
  • Ketema Tilahun
    • 2
  • Tilahun Hordofa
    • 3
  1. 1.Meki Agricultural OfficeMeki-ZewayEthiopia
  2. 2.Haramaya UniversityHaramayaEthiopia
  3. 3.Awash Melkassa Agricultural Research CenterNazarethEthiopia

Personalised recommendations