1.Abu-rayyan, A., Gianquinto, G. and Askan, A.W. 2012. Onion Seed Germination as affected by temperature and light. Int. J. Veg. Sci. 8: 1. 49-63.
2.Amrawat, T., Solanki, N.S., Sharma, S.K., Jajoria, D.K. and Dotaniya, M.L. 2013. Phenology growth and yield of wheat relation to agro-meteorological indices under different sowing date. African J. Agric. Res. 8: 49. 6366-6374.
3.Ansari, N.A. 2007. Effect of density, cultivars and sowing date on onionsets production. Asian J. Plant Sci.6: 1147-1150.
4.Anonymus. 2017. Agricultural statistics, first volume-field crop, 2015-16. Ministry of Jihad-e- Agriculture, Programing and Economic Deputy, Statistics and Information Technology Office. 117p.(In Persian)
5.Bierhuizen, J.F. and Wagenvoort, W.A. 1974. Some aspects of seed germination in vegetables. I. The determination and application of heat sums and minimum temperature for germination. Sci. Hort.2: 213-219.
6.Brewster, J.L. 1990. Physiology of crop growth and bulbing. P 53-58. In: Brewster, J.L. and H.D. Rabinowitch (eds), Onions and Allid Crops. Volume 1. CRC Press. Boca Raton. Florida.
7.Brewster, J.L. 2008. Onions and Other Vegetable Alliums. 2nd edition. CABI International, UK. 432p.
8.Bosekeng, G. 2012. Response of onion (Allium cepa L.) to sowing date andplant population. Submitted in the fulfillment of the requirements for the degree of Magister Scientiae Agriculture (Horticulture). Department of soil, crop and climate science. University of the free state of Bloemfontein, South Africa. 42p.
9.Bosekeng, G. and Coetzer, G.M. 2015. Response of onion (Allium cepa L.) to sowing date and plant population in the Central Free State, South Africa. Afr. J. Agric. Res. 10: 4. 179-187.
10.Bosch-Serra, A.D. and Currah, L. 2002. Agronomy of onions. P 187-223. In: Rabinowitch, H.D. and L. Currah, (eds), Allium Crop Science: Recent Advances. CAB International Wallingford, UK.
11.Bybordi, A. and Malakoti, M.J. 1999. The necessary of optimum application of fertilizer to increase yield and quality and reduce nitrate concentration in onion bulb. Publications of Agricultural Education, Karaj, Iran. 16p. (In Persian)
12.Comrie, A.G. 1997. Climatic and soil requirements for onions. OnionsB.1, Agricultural Research Council, Vegetable and Ornamental Plant Institute, Pertoria, South Africa.
13.Darabi, A. 2009. Study of bulbing physiology in important local populations of Iranian onion in Behbahan and Karaj province. Ph.D. Thesis, College of Agriculture, University of Tehran, Karaj, Iran. 162p. (In Persian)
14.Darabi, A. 2016. Physiology and Production of Onion. Publications of Agricultural Education, Karaj, Iran. 276p. (In Persian)
15.Darabi, A. 2017. Study on the agro-metrological indices at different phonological stages and growth analysis of new potato cultivars. Iran. J. Hort. Sci. Technol. 18: 3. 271-268.
16.Darabi, A., Kash, A., Babalar, M. and Khdadadi, M. 2010. Determination the threshold of photoperiodism and cumulative thermal time related to bulbing and growth analysis of onion cultivars. Iran. Hort. Sci. (Iran. J. Agric. Sci.) 40: 4. 23-33. (In Persian)
17.Edalat, E. and Naderi, R. 2016. Evaluation of sowing date and phonology of corn hybrids using thermal indices. J. Crop Prod. Proc. 61: 9. 46-67. (In Persian)
18.Eatebarian, H.R. 2002. Vegetable Diseases and Their Control. Tehran Unversity Press, Tehran, Iran. 600p.(In Persian)
19.Grijesh, G.K., Kumara Swamy, A.S., Sridhara, S., Dinish Kumar, M., Vageesh, T.S. and Nataraju, S.P. 2011. Heat use efficiency and helio thermal units of maize genotypes as influenced by date of sowing under Southern transitional zone of Karanatak state. Int. J. Sci. Nat. 2: 3. 529-533. 12.
20.He, Y., Jin, H., Gong, W., Zhang, C. and Zhou, A. 2014. Effect of onion flavonoids on colorectal cancer with hyperlipidemia: an in vivo study. OncoTar. Thera. 7: 101-110.
21.Jones, J.W., Hogenboom, G., Porter, C.H., Bootee, K.J., Batchlore, W.D., Haunt, L.A., Wilkens, P.W., Singh, U., Gijman, A. and Ritchie, J.T. 2003. The DSSAT Cropping System Model. Eur.J. Agron. 18: 235-265.
22.Kalbarczyk, R. and Kalbarczyk, E. 2015. The adverse effect of the long-term trend of the airt emperature in Poland on the yield of onion. J. Cen. Eur. Agric. 16: 1. 41-53.
23.Kamboj, N.K., Batra, V.K., Aniket Vilas, C.A. and Sharma, P.K. 2017. Effect of planting dates and paclobutrazol on yield and quality of onion (Allium cepa L.) seed. Int. J. Pure App. Biosci. 5: 1. 417-424.
24.Khokhar, K.M. 2017. Environmental and genotypic effects on bulb development in onion – a review.J. Hort. Sci. Biotechnol. 92: 5. 448-454.
25.Khokhar, K.M., Hussain, S.I., Mahmood, T., Hidayatullah, T. and Laghari, M.H. 2002. Bulb yield and quality as affected by set size in autumn season onion crop. Asian J. Plant Sci.1: 657-658.
26.Lancaster, J.E., Trigs, C.M., De Ruiter, J.M. and Gander, P.W. 1996. Bulbing in onions: photoperiod and temperature requirements and prediction of bulb size and maturity. Ann. Bot. 78: 423-430.
27.Maji, S., Bhowmick, M., Chakraborty, P., Jena, S., Dutta, S.K., Nath, R., Bandyopahyay, P. and Chakraborty, P. K. 2014. Impact of Agro-meteorological on growth and productivity of potato (Solanum tuberosum L.) in Eastern India. J. Crop Weed. 10: 2. 193-189.
28.Mote, B.M., Kumar, M. and Ban,Y.C. 2015. Agro-meteorological indices of rice cultivars under different environmental at Navsari (Gujrat), India. Plant Arc. 15: 2. 913-917.
29.Parkash, D., Singh, B.N., andUpadhyay, G. 2007. Antioxidant and free scavenging activities of phenols from onion (Allium cepa L.). Food Chem. 102: 40. 1389-1393.
30.Perez, N.K., Market, N.K., Zekeli, S., and Zorb, C. 2018. Quality aspects in open- pollinated onion varieties from western Europe. J. Appl. Bot. Food Qual. 91: 69-78.
31.Rao, V.U.M., Singh, D. and Singh, R. 1999. Heat use efficiency of wintercrop in Haryana. J. Agron, Met.1: 2. 143-148.
32.Sahul, K., Sharma, P.K., Dixit, A. and Nair, S.K. 2018. Correlation and path coefficient analysis in kharif onion (Aillum cepa L.) genotypes for chhattisgarh plains. Int. J. Curr. Microbiol. Appl. Sci. 6: 256-263.
33.Shah Murad, S., Khalid Niaz, K., Ali, A. and Aslam, A. 2018. Ginger and onion: new and novel considerations. Pharm. Pharmacol. Int. J. 6: 1. 49-52.
34.Singh, M.P., Lallu, K.R. and Sign, N.B. 2014. Thermal requirement of Indian mustard (Brassica juncea) at different phenological stages under latesown condition. Ind. J. Plant Physiol.19: 3. 238-243.
35.Steer, B.T. 1982. The effect of growth temperature on dry weight and carbohydrate content of onion (Allium cepa L.Cv. Creamgold) bulbs. Aust. J. Agric. Res. 33: 559-563.
36.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.
37.Tesfay, S.Z., Bertling, I., Odindo,A.O., Greenfield, P.L. and Workneh, T.S. 2011. Growth responses oftropical onion cultivars to photoperiod and temperature based on growing degree days. Afr. J. of Biotechnol.10: 71. 15875-15882.