1.Aminpoor, R., Mobli, M. and Mirtazawee Bake, A. 2012. Study quantitative and qualitative characteristics of Onion (Allium cepa L.) short days cultivars in Isfahan. J. Hort. Sci. 25: 4. 404 -410. (In persian)
2.Brewster, J.L. 2008. Onions and other vegetable alliums. (2nd ed.). CABI International.
3.Bosch Serra, A.D. and Currah, L. 2002. Agronomy of onion. In: H.D. Rabinowitch and L. Currah, L. (Eds.). Allium Crop Science: Recent Advanced. (pp. 187-223). CAB Publishing. UK.
4.Dehdari, A., Rezai, A. and Mobli, M. 2001. Morphological and agronomic characteristics of landrace varieties of onion (Allium cepa L.). J. Sci. Technol. Natur. Resour. 5: 2. 109-124. (In Persian).
5.Demir Kaya, M., Okcu Gamze Atak, M., Cikili, Y. and kolsarici, O. 2006. Seed
treatment to overcome Salt and drought stress during germination in sunflower (
Helianthus annuus L.). Europ. J. Agron. 24: 291- 295.
6.Demason, D.A. 1990. Morphology and anatomy of allium. In: H.D. Rabinowitch
and J.L. Brewster (Eds.). Onions and Allied crops.Vol. I. CRC Press, Inc., 27-
7.Devaraju, P.J., Nagamani, S., Veere Gowda, R., Yogeesha, H.S., Gowda, R., Nagaraju, K. and Shashidhara, N. 2011. Effect of chemo priming on plant growth and bulb yield in onion. Int. J. Agril., Envron. and Biotech. 4: 2.121- 123.
8.Dorna, H., Jarosz, M., Szopinska, D. Szulc, I. and Rosinska, A. 2013. Germanation,vlgour and health of primed Allium cepa L. seeds after storage. Acta Sci. Pol. Hortorum Cultus. 12: 4. 43-58.
9.Gamiel, S., Smittle, D.A. and Mills, H.A. 1990. Onion seed size, weight, and elemental content affect germination and bulb yield. Horti. Sci. 25(5): 522-523.
10.Ghiyasi, M., Abbasi, A.S., Tajbakhsh, M., Amirnia, R. and Salehzade, H. 2008. Effect of osmopriming with polyethylene glycol 8000 on germination and seedling growth of wheat (Triticum aestivum L.) seed under salt stress. Res. J. Biol. Sci. 3: 10. 1249-1251.
11.Haromoto, E.R. and Gallandt, E.R. 2005. Brassica cover cropping: II. Effects on growth and interfrence of green bean (Phaseolus vulgaris) and redroot pigweed (Amaranthus retroflexus). Weed Sci. 19: 4. 187-198.
12.Iortsuun, D.N. and Khan, A.A. 1999. The pattern of dry- matter distribution during development in onion. J. Agron. Crop Sci. 162: 127 - 134.
13.Izadkhah, M., Tajbakhsh, M., Zardoshti, M.R., Hasnzade, A., Taheri, F., SaberRezaie, M., Feghnabi, F. and Parvizi, S. 2009a. Investigation the influence of planting methods on bulb and biologic yield, harvest index and some morphological triats in onion (Allium cepa L.). Online International J. Agron. Biol. 2: 4. 189-193.
14.Izadkhah, M., Tajbakhsh, M., Hasnzadeand, A. and Moosavezade, S.A. 2009b. Study effects of different planting systems on marketable yield, grading and some bulb quality traits in onion (Allium cepa L.). Online International J. Agron and Biolo. 2: 7. 366-369.
15.Izadkhah, M., Tajbakhsh, M., Zardoshty, M.R. and Hasanzadeh Goratteph, A. 2010c. Evaluation effects of different planting systems on water use efficiency, relative water content and some plant growth parameters in onion (Allium cepa L.). Not. Sci. Biol. 2: 1. 88-93.
16.Izadkhah, M., Tajbakhsh, M. and Amernia, R. 2010d. Effects of different size and age of transplanting of seedling on marketable and biological yield, harvest index and some qualitative characters of long– day and intermediate- day Onion (Allium cepa L.) cultivars. J. Horti. Sci. 24: 2. 203-215. (In Persian)
17.Kanton, R.A.L., Abbey, L., Hilla, R.G., Tabil, M.A. and Jan, N.D. 2002. Influence of trasplanting age on yield and yield components of onion (Allium cepa L.). Haworth press, Pp: 27-37.
18.Kaya, M.D. and Day, S. 2008. Relationship between seed size and NaCl on germination, seed vigor and early seedling growth of sunflower (Helianthus annuus L.). Afr. J. Agric. Res. 3: 787-791.
19.Khokhar, K.M., Hidayat, P., Mahmood, T., Hussain, S.I., Bhatti, M.H. and Laghari, M.H. 2002. Effect of seedling/set sizes and planting times on bulb yield and quality in onion cultivar ‘Phulkara’ during autumn season. Asian J. Plant Sci. 1(6): 665-667.
20.Martinz, M.C., Corzo, N. and Villiamiel, M. 2007. Biological properties of onion and garlic. Trends in Food Sci.Technol. 18: 12. 609-625.
21.Masshia, S., Motallebi, A., and Shekari, F. 2001. Effct of different sowing methods on yield and bulb chracteristics in onion (Allium cpea L.). J. Acta Agron. Hungarica, 49(2): 169-174.
22.McDonald, M.B. 2000. Seed priming. Seed technol and its Biological Basis. Pp: 287-325.
23.Mettanada, K.A. and Fordham, R. 1999. The effects of plant size and leaf number on the bulbing of tropical short - day onion cultivars (Allumcepa L.) under controlled environments in the United Kingdom and tropical field conditions in Srilanka. J. Horti. Sci. Biotechnol. 74: 5. 623 - 633.
24.Mirzaee, Y. and Khodadadi, M. 2008. The survey of production methods effects (transplant, onion set and seed) on the some traits in onion (Allium cepa L.) cultivars at continued production design in Jiroft region. Pajouhesh and Sazandegi 80: 69-76. (In Persian)
25.Mohanty, B.K., Barik, T. and Dora, D.K. 1990. Effect of time of transplanting and age of seedling on yield of onion (Allium cepa L.). Indian J. Agron. 39: 2. 111-113.
26.Moosavezadh, S.A. 2006. Study geneticdiversity Iranian onion landraces using morphological and molecular, Ph.D. Thesis. University of Tabriz, Iran (In Persian)
27.Mut, Z., Akay, H. and Nevzat, A. 2010. Effects of seed size and drought stress on germination and seedling growth of some oat genotypes (Avena sativa L.)Afr. J. Agric. Res. 5: 10. 1101-1107.
28.Pollck, B.M. and E.E. Roose. 1998. Seed and seedling vigour. In: Kozlowski. T.(ed) seed biology. Academic Preess. New York, Pp: 313-387.
29.Rabinowitch, H.D. and Brewster, J.L. 1992. Onions and allied crops. CRC. Press, Inc. Boca Raton. Florida, 1: 57-60.
30.Ram, C., Kumari, P., Singh, O. and Sardana, R.K. 1999. Relationship between seed vigour tests and field emergence chickpea. Seed Sci. Technol. 17: 169-177.
31.Ramtohul, M. and Splittstoesser, W.E. 1999. The effect of bulb and neck size upon establishment, transplanted onion. Horti. Sci. 14: 736-738.
32.Ronald, C., Johnson, D. and Kidman, C. 1990. The effect of bolting and seed stalk removal on yield and sucrose content of sugar beets. J. Amr. Soc. Sugar Beet Techno. 15: 8. 657-660.
33.Rouamba, A., Robert, T., Sarr, A. and Ricroch, A. 1996. A preliminary germplasm evaluation of onion landraces from west Afr. Genome. 39: 1128- 1132.
34.Singh, R.S. 1993. Studies on the effect of different transplanting dates on growth and yield of onion (Allium cepa L). Current Agric. 17(1-2): 41-45.
35.Shanumugasundaram, S. 2001. Onion Cultivasion. Asian Vegetable Research and Development Center. Learning Center. 9p.
36.Smit, A.D. 1983. Influence of external factors on growth and development of sugar-beet (Beta vulgaris L.). Centre for Agricultural Publishing and Documentation Wageningen, Netherlands. 109p. 37.Spurr, C.J., Fulton, D.A., Brown, P.H. and Clark, R.J. 2002. Changes in seed yield and qulity in onion (Allium cepa L.) cv. Early Cream Gold. J. Agron. Sci. 188: 275-280.
38.Tajbakhsh, M. and Ghiyas, M. 2008. Seed ecology. Urmia Jahad university publication. 389p. (In Persian)
39.Tei, F., Scaife, A. and Aikman, D.P. 1996. Growth of lettuce, onion and red beet. 1. Growth analysis, light interception and radiation use efficiency. Ann. Bot. 78: 633-644.
40.Tuba Bicer, B. 2009. The effect of seed size on yield and yield components of chickpea and lentil. Afr. J. Biotech. 8: 8. 1482-1487.
41.Winter, S.R. and Ohlrorgge, A.J. 1988. Leaf angle, leaf area and corn (Zea mays L.) yield. J. Agron. 65: 395-402.
42.Umair, A., Ali, S., Bashir, K. and Hussain, S. 2010. Evaluation of different seed priming techniques in mungbean (Vigna radiata). Sci. Environ. 29: 181-186.
43.Yarnia, M., Farajzadeh, E. and Tabrizi, M. 2012. Effect of seed priming with different concentration of GA3, IAA and Kinetin on Azarshahr Onion germination and seedling growth. J. Basic. Appl.Sci. Rese. 2: 3. 2657-2661.
44.Zareian, A., Hamidi, A., Sadeghi, H. and Jazaeri, M.R. 2013. Effect of seed size on some germination characteristics, seedling emergence percentage and yield of three wheat (Triticum aestivum L.) cultivars in laboratory and field. MiddleEast J. Sci. Res. 13: 8. 1126-1131.