Bolting in onion bulb crops as influenced by cultivars and transplanting dates

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Research Paper 01/01/2021
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Bolting in onion bulb crops as influenced by cultivars and transplanting dates

Noor Habib Khan, Shah Msaud Khan, Ayub Khan, Muhammad Zamin
Int. J. Biosci.18( 1), 36-45, January 2021.
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Bolting reduces the quality and commercial yield of bulb onion, however, seed production is directly dependent on flower induction and bolting. Field experiments were conducted during two cropping seasons 2013-14 and 2014-15 at the Agricultural Research Institute, Swat, Pakistan to study the effects of three onion cultivars with five transplanting dates on bolting and marketable yield of onion. Seedlings of three onion cultivars were transplanted on five different dates with 15 days interval in a randomized complete block design. Onion cultivars varied in their susceptibility to bolting. Cultivar Swat-1 took significantly maximum days to bolting initiation and recorded a minimum bolting percentage compared to ‘Saryab Red’ and ‘Chiltan-89’. Early transplanting took 108.06 days to bolting initiation. The Bolting percentage was maximum at early transplanting and reduced with delay in transplanting from 25th November to 25th December. Bolting has not been recorded at late, (10th and 25th January) transplanting irrespective of the cultivar. Compare to ‘Saryab Red’ and ‘Chiltan-89’, ‘Swat-1’ has maximum plant height, leaves per plant, bulb diameter, bulb weight, total and marketable yield ton ha-1. Bulb diameter, bulb weight, days to maturity, and total yield ton ha-1 was maximum at early transplanting and decreased with delay in transplanting. Marketable yield was maximum at mid transplanting date (25th December); attributed to less bolting and percent cull compared to early transplanting. Unmarketable yield at early transplanting was largely due to bolting while at late transplanting it was due to small ungraded bulbs.


Abdissa A, Tekalign T, Pant LM. 2011. Growth, bulb yield and quality of onion (Allium cepa L.) as influenced by nitrogen and phosphorus fertilization on vertisol I. growth attributes, biomass production and bulb yield. African. Journal of Agriculture. Research 6(14), 3252-3258.

Baliyan SP. 2014. Evaluation of Onion Varieties for Productivity in Performance in Botsowana. World Journal of Agricultural Research 2(3), 129-135.

Bijarniya N, Jat M, Patel B, Bana M. 2015. Effect of Age of Seedling and Dates of Transplanting on Growth, Yield and Quality of Onion (Allium Cepa L.) in Rabi under North Gujarat Condition. The Journal of Rural and Agricultural Research. 15(2), 38-42.

Bosekeng G, Coetzer GM. 2013. Response of onion (Allium cepa L.) to sowing dates. African Journal of Agriculture Research. 8(22), 2757-2764.

Brewster JL. 2008. Onions and other vegetable alliums, 2nd ed. CAB International, Oxford shire, United Kingdom, p 85-150.

Brewster JL. 1994. Onions and other vegetable alliums. 1st ed., CAB International, Wallingford, United Kingdom.

Cramer CS. 2003. Performance of fall-sown onion cultivars using four seeding dates. J. American Society of Horticulture Science 128, 472-478.

Dong Y. Cheng Z, Meng H, Liu H, Wu C, Khan AR. 2013. The effect of cultivar, sowing date and transplant location in field on bolting of welsh onion (Allium fistulosum L.).BMC Plant Biology 13, 154.

Ibrahim ND. 2010. Growth and yield of Onion (Allium cepa L.) in Sokoto, Nigeria. Agriculture and Biology Journal of North America 1(4), 556-564.

Jilani MS, Ghafoor A. 2003. Screening of local varieties of onion for bulb formation. International Journal of Agriculture and Biology 5(2), 129-133.

Khan NH. 2017. Premature bolting in onion bulb crop; effect of transplanting dates, seedling age, nitrogen fertilizer and cultivars. PhD. Thesis. Page: 6-7. Department Agricultural Sciences. The University of Haripur, Pakistan.

Khan NH, Khan SM, Khan NU, Khan A, Farid A, Khan SA, Ali N, Saeed M, Hussain I, Ali S. 2019. Flowering initiation in onion bulb crop as influenced by transplanting dates and nitrogen fertilizer. The Journal of Animal and Plant Sciences 29(3), Page: 772-782 ISSN: 1018-7081.

Khan SA, Amjad M, Khan AA. 2001. The extent of inbreeding depression in seven cultivars of onion (Allium cepa L.). International Journal of Agriculture Biology 3, 498-500.

Khokhar KM, Hadley P, Pearson S. 2007a. Effect of cold temperature durations of onion sets in store on the incidence of bolting, bulbing and seed yield. Scientia Horticuturae. 112, 16-22. ISSN: 0304-4238.

Khokhar KM. 2008. Effect of temperature and photoperiod on the incidence of bulbing and bolting in seedlings of onion cultivars of diverse origin. Journal of Horticulture Science and Biotechnology 83(4), 488–496.

Kimani PM, Peters R, Rabinowitch HD. 1993. Potential of onion seed production in a tropical environment. Acta Horticulturae, Wageningen 358(1), 341-348.

Lancaster JE, McCartney EP, Jermyn WA, Johnstone JV. 1995. Identification of onion cultivars for commercial production in Canterbury New Zealand. New Zealand Journal of Crops and Horticulture Science 23(3), 299-306.

Madisa ME. 1994. The effect of planting date set size and spacing on the yield of onion (Allium cepa L.) in Botswana. Acta Horturae. 358, 353-357.

Mushtaq S, Amjad M, Ziaf K, Cheema KL, Raza MA, Hafeez OBA. 2013. Productive and qualitative evaluation of onion cultivars under agro-climatic conditions of Faisalabad. Pakistan Journal of Agriculture Science. 50(2), 199-203.

Patil DG, Dhake AV, Sane PV, Subramaniam VR. 2012. Studies on different genotypes and transplanting dates on bulb yield of high solid white onion (Allium cepa L.) under short-day conditions. Acta Horturea. 969, 143-148.

Rabinowitch HD. 1990. Physiology of Flowering, p 113-134. In. H.D. Rabinowitch and J.L. Brewester (ed.,). Onion and Allied Crops. CRC press. Boca Ranton, Florida, USA.

Rana MK, Hore JK. 2015. Onion. In: Technology for vegetable production. Rana, M.K., (ed.,) Kalyani publishers, New Delhi, India.

Sawant SV, Inciavale MT, Manciave KK, Wxih BK, Biiat NR. 2002. Effect of date of planting on growth, yield and quality of onion (allium cepa L.). Vegetable Science 29(2), 164-166.

Tendaj M, Mysiak B. 2013. The effect of summer seedling planting dates on the development of seed stalks in shallot (Allium cepa L. var. ascalonicum Backer). Acta Scientiarum. Polonorum, Hortorum Cultus 12(6), 57-66.

Voss RE, Murray M, Mayberry KS, Miller I. 1999. Onion seed production in California. University of California, Division of Agriculture and Natural Resources. California. United States of America.