Potential of Adelaide, Cradock and Middelburg, South Africa, for out-of-season onion production using different planting materials and planting dates

References

• Ansari NA. 2007. Effect of density, cultivars and sowing date on onion sets production. Asian Journal of Plant Sciences 6: 1147–1150. doi: 10.3923/ajps.2007.1147.1150
   Google Scholar
• Baninasab B, Rahemi M. 2006. The effect of high temperatures on sprouting and weight loss of two onion cultivars. American Journal of Plant Physiology 1: 199–204. doi: 10.3923/ajpp.2006.199.204
   Google Scholar
• Bester C. 1993. Planttyd van uie. In: Proceedings of onion conference, 15 September 1993, Roodeplaat, South Africa. Pretoria: Agricultural Research Council, Vegetables and Ornamental Plant Institute.
   Google Scholar
• Brewster JL. 1997. Onion and garlic. In: Wien HC (ed.), Physiology of vegetable crops. Wallingford: CAB International.
   Google Scholar
• Brewster JL. 2008. Physiology of crop growth. In: Atherton J, Rees A (eds), Onions and other vegetable alliums (2nd edn). Wallingford: CAB International.
   Google Scholar
• Department of Agriculture. 1990. Publication of regulations relating to the grading, packing and marking of onions and shallots intended for sale in the Republic of South Africa. ACT No. 119 of 1990. Government Gazette South Africa 32282.
   Google Scholar
• Derawadan SA, Shoukat A, Tahir M, Majeed A, Khan A. 2002. Date of sowing and genotype interaction effect on the bulb yield of transplanted onion (Allium cepa L.). Asian Journal of Plant Sciences 1: 675–677. doi: 10.3923/ajps.2002.675.677
   Google Scholar
• Directorate Marketing. 2011. A profile of the South African onion market value chain. Arcadia: Directorate Marketing, Department of Agriculture, Forestry and Fisheries, Republic of South Africa. Available at http://www.nda.agric.za/docs/AMCP/ONIONMVC2011.pdf [accessed 9 December 2012].
   Google Scholar
• Directorate of Statistics and Economic Analysis. 2011. Crops and markets, vol. 92, no. 948. Pretoria: Directorate of Statistics and Economic Analysis, Department of Agriculture, Forestry and Fisheries, Republic of South Africa.
   Google Scholar
• Gruszecki R, Tendaj M. 2001. Effect of cultivation method on the earliness and structure of onion yield. Vegetable Crops Research Bulletin 54(2): 45–48.
   Google Scholar
• ISCW (Institute for Soil, Climate and Water). 2005. Weather data for the Adelaide, Cradock and Middelburg (EC) locations for the year 2005. Pretoria: Agro-meteorological Section, Institute for Soil, Climate and Water.
   Google Scholar
• Ishwori PG, Bhogendra K, Govinda PP. 2006. Evaluation of different varieties of onion and their transplanting times for off-season production in Mid Hills of Nepal. Nepal Agricultural Research Journal 7: 21–26.
   Google Scholar
• Karim SMR, Ibrahim NR. 2013. Effect of planting time, day length, soil pH and soil moisture on onion. International Journal of Biology, Pharmacy and Allied Sciences 2: 807–814.
   Google Scholar
• Kawagishi K, Abe T, Ubukata M, Kato S. 2009. Inhibition of flower stalk elongation and abnormal flower development by short-day treatment in a Japanese variety of Chinese chive (Allium tuberosum Rottler ex Sprengel). Scientia Horticulturae 119: 197–202. doi: 10.1016/j.scienta.2008.07.018
   Web of Science ®Google Scholar
• Kerr B. 2015. Getting started with onions. Farmer’s Weekly, 24 February 2015. Available at http://www.farmersweekly.co.za/article.aspx?id=69378&h=Getting-started-with-onions/ [accessed 9 February 2016].
   Google Scholar
• Krause M, Nel A, van Zyl K. 1996. A guide to the use of pesticides and fungicides in the Republic of South Africa. Pretoria: Directorate of Livestock Improvement and Agricultural Production Resources, National Department of Agriculture, South Africa.
   Google Scholar
• Khokhar KM, Hadley P, Pearson S. 2007. Effect of photoperiod and temperature on inflorescence appearance and subsequent development towards flowering in onion raised from sets. Scientia Horticulturae 112: 9–15. doi: 10.1016/j.scienta.2006.12.009
   Web of Science ®Google Scholar
• Lancaster JE, Triggs CM, de Ruiter JM, Gandar PW. 1996. Bulbing in onions: photoperiod and temperature requirements and prediction of bulb size and maturity. Annals of Botany 78: 423–430. doi: 10.1006/anbo.1996.0138
   Web of Science ®Google Scholar
• Lee EJ, Suh JK. 2009. Effect of temperature on the growth, pyruvic acid and sugar contents in onion bulbs. Korean Journal of Horticultural Science and Technology 27: 554–558.
   Web of Science ®Google Scholar
• Milenković L, Ilić Z, Ðurovka M. 2010. Possibility of onion production in autumn sowing and planting. Agroznanje – Agro-Knowledge Journal 11(3): 47–54.
   Google Scholar
• NCSS. 2000. Statistical analysis and graphics system for Windows. East Kaysville: NCSS.
   Google Scholar
• O’Connor D. 2006. Production of onion sets and onions from sets. Vegetable Crops Research Bulletin 64: 181–187.
   Google Scholar
• Okporie EO, Ekpe II. 2008. Effect of photoperiod on the growth and bulbing of tropical onion (Allium cepa L) varieties. World Journal of Agricultural Sciences 4: 36–39.
   Google Scholar
• Steer BT. 1980. The bulbing response to day length and temperature of some Australasian cultivars of onion (Allium cepa L.). Australian Journal of Agricultural Research 31: 511–518. doi: 10.1071/AR9800511
   Google Scholar
• Tesfay SZ, Bertling I, Odindo AO, Greenfield PL, Workneh TS. 2011. Growth responses of tropical cultivars to photoperiod and temperature based on growing degree days. African Journal of Biotechnology 10: 15875–15882. doi: 10.5897/AJB11.983
   Google Scholar
• van den Berg AA. 1993. Produksie van plantuitjies. Proceedings of onion conference, 15 September 1993, Roodeplaat, South Africa. Pretoria: Agricultural Research Council, Vegetables and Ornamental Plant Institute.
   Google Scholar
• van der Merwe J. 2006. Physiological disorders in onions. Starke Ayres Seedlings News 2006(January): 19.
   Google Scholar
• Wickramasinghe UL, Wright CJ, Currah L. 2000. Bulbing responses of two cultivars of red tropical onions to photoperiod, light integral and temperature under controlled growth conditions. Journal of Horticultural Sciences and Biotechnology 75: 304–311. doi: 10.1080/14620316.2000.11511242
   Web of Science ®Google Scholar