1. Yield-based irrigated onion crop coefficients;Al-Jamal;ASAE Applied Engineering in Agriculture,1999
2. Allen, R.G., Pereira, L.S., Raes, D., Smith, M., 1998. Crop Evapotranspiration: Guide-lines for Computing Crop Water Requirements. Irrigation and Drainage Paper No. 56. FAO, Italy.
3. Actual evapotranspiration and crop coefficients of onion (Allium cepa L.) under varying soil moisture levels in the humid tropics of India;Bandyopadhyay;Tropical Agriculture,2003
4. Regulated deficit irrigation scheduling of onion in a semiarid region of Ethiopia;Bekele;Agricultural Water Management,2007
5. Growth Stages of Mono-and Dicotyledonous Plants BBCH Monograph;Bleiholder,2001