Aklilu M (2009). Effects of mulching and depth of irrigation application on water use efficiency and productivity of pepper under gravity drip irrigation, MSc. Thesis, Department of Irrigation Engineering, Haramaya University, Ethiopia.

Al-Harbi AR (2002). Effect of irrigation regimes on growth and yield of onion (Allium cepa L.). J. King Satui Univ. 15.

Al-Moshileh AM (2007). Effects of planting date and irrigation water level on onion (Allium cepa L.) production under central Saudi Arabian conditions. J. Basic Appl. Sci. 8(1):14-28.

Bakker DM, Raine SR, Robertson MJ (1997). A preliminary investigation of alternate furrow irrigation for sugar cane production. Processing of the 1997 conference of the Australian Society of Sugar Cane Technologists hold at Cairns, Queensland, 29th April to 2nd May 1997, Brisbone.

Biswas SK, Sarker PK, Islam AM, Bhuiyan MA, Kundu BC (2003). Effect of irrigation on onion production. Pak. J. Biol. Sci. 6(20):1725-1728.
Crossref

Boyhan GD, Granberry KT (2001). Onion production guide. The University of Georgia College of Agricultural Environmental Science. Bulletin 1198.

Cortés CF, de Santa Olalla FM, Urrea RL (2003). Production´ of garlic (Allium sativum L.) under controlled deficit irrigation in a semi-arid climate. Agric. Water Manage. 59(2):155-167.
Crossref

Currah L, Proctor FJ (1990). Onion in Tropical Regions. Natural Resources institute. Chatham Maritime, Kent, UK. P 232.

de Santa Olalla FM, de Juan Valero JA, Cortes CF (1994). Growth and production of onion crop (Allium cepa L.) under different irrigation scheduling. Eur. J. Agron. 3(1):85-92.
Crossref

de Santa Olalla FM, Domınguez-Padilla A, Lopez R (2004). Production and quality of the onion crop (Allium cepa L.) cultivated under controlled deficit irrigation conditions in a semi-arid climate. Agric. Water Manage. 68:77-89.
Crossref

Dyson T (1999). World food trends and prospects to 2025. Proc. Natl. Acad. Sci. USA 96:5929-5936.
Crossref

Food and Agricultural Organization (FAO) (2002). Deficit irrigation practices. Water Reports 22. Available at: http://www.fao.org/tempref/agl/AGLW/ESPIM/CD-ROM/documents/5K_e.pdf.

Food and Agricultural Organization (FAO) (2005). AQUASTAT. FAO's Information system on water and Agriculture.

Fereres E, Connor DJ (2004). Sustainable water management in agriculture. In: Cabrera E and Cobacho R, editors. Challenges of the new water policies for the XXI century. Lisse, the Netherlands: A.A. Balkema; pp. 157-170.

Ferreira TC, Carr MKV (2002). Response of potatoes (Solanum tuberasum L.) to irrigation and nitrogen in a hot, dry climate: I. water use. Field Crops Res. 78(1):51-64.
Crossref

Gençoglan C, Yazar A (1999). The effects of deficit irrigations on corn yield and water use efficiency. Turk. J. Agric. Forest. 23: 233-241.

Kebede W (2003). Shallot (Allium cepa var. ascalonicum) responses to plant nutrient and soil moisture in a sub- humid tropical climate. J. Hortic. Sci. Biotechnol. 78(4):549-555.

Kirnak H, Higgs D, Kaya C, Tas I (2005). Effects of irrigation and nitrogen rates on growth, yield, and quality of musk melon in semiarid regions. J. Plant Nutr. 28:621-638.
Crossref

Kumar S, Imtiyaz M, Kumar A, Singh R (2007a). Response of onion (Allium cepa L.) to different levels of irrigation water. Agric. Water Manage. 88:161-166.
Crossref

Mansouri-Far C, Sanavy SA, Saberali SF (2010). Maize yield response to deficit irrigation during low-sensitive growth stages and nitrogen rate under semi-arid conditions. Agric. Water Manage. 97:12-22.
Crossref

MehARC (2015). Mehoni Agricultural Research Center, Land and water research process, Annual research report of 2014/2015, Maichew, Tigray, Ethiopia.

Otegui ME, Andrade FH, Suero EE (1995). Growth, water use, and kernel abortion of maize Subjected to drought at silking. Field Crops Res. 40(2):87-94.
Crossref

Pandey RK, Maranville JW, Admou A (2000). Deficit irrigation and nitrogen effects on maize in a Sahelian environment. I. Grain yield and yield components. Agric. Water Manage. 46:1-13.
Crossref

Postel SL, Daily GC, Ehrlich PR (1996). Ehrlich PR. Human appropriation of renewable freshwater. Science 271:785-788.
Crossref

Sammis TW, Smeal D, Williams S (1988). Predicting corn yield under limited irrigation using plant height. Transactions of the ASAE. 3(13):830-838.
Crossref

Samson B, Ketema T (2007). Regulated deficit irrigation scheduling of onion in a semiarid region of Ethiopia. Agric. Water Manage. 89:148-152.
Crossref

Sarkar S, Goswami SB, Mallick S, Nanda MK (2008). Different indices to characterize water use pattern of micro-sprinkler irrigated onion (Allium cepa L.). J. Agric. Water Manage. 95:625-632.
Crossref

Sepaskhah AR, Ghasemi M (2008). Every-other-furrow irrigation with different intervals for sorghum. Pak. J. Biol. Sci. 11(9):1234-1239.
Crossref

Shock CC, Feibert EBG, Saunders LD (1998). Onion yield and quality affected by soil water potentials as irrigation threshold. Hortic. Sci. 33:1188-1191.

Shock CC, Feibert EBG, Saunders LD (2000). Irrigation criteria for drip-irrigated onions. HortScience 35:63-66.

Takele G (2009). Effect of drip irrigation levels and planting methods on yield and water use efficiency of Pepper in Bako, Western Oromia. M.Sc thesis presented to Haramaya University, Ethiopia.

Wien H (1997). Physiology of vegetable crops. In: J.L. Brewster (Ed.). Onions and Garlic, Cambridge University Press, New York. pp. 581-612.

Zayton AM (2007). Effect of soil-water stress on onion yield and quality in sandy soil. J. Agric. Eng. 24(1):141-160.