Published in Scientific Papers. Series A. Agronomy, Vol. LVIII
Written by Mehdi AZIZI
In order to determining the proper planting date for cold tolerant spring type cultivars of rapeseed, a two years experiment was done in Agriculture and Natural Resources Research Center of Khorasan-Razavi, Toroq Station in Mashhad , at North-east of Iran during 2006-2008 growing season. In this experiment seven planting dates with one month intervals from 23 Sept. to 23 March, were studied. Two cultivars namely, Hyola401 (Hybrid) and RGS003 (Standard Open Pollinated) were set as main plots and planting dates as sub plots in a split plot design, with four replications. Seed yield and yield components, i.e. number of branches per plant, number of pod per plant, was determined. Plant height at maturity stage also measured. Results showed, Hyola401 had greater yield especially in 23 Sept. and 23 Oct. planting dates. Planting of this cultivar on 23 Feb., as spring cultivation, produced a proper seed yield. This hybrid regardless of its shorter height, had very optimum branch number and also pods per plant and these tends it to achieve higher seed yield .For escaping from chilling stress in fields that is probable at the presence of reproductive stages at the end of fall, it is recommended , the farmers cultivate the Hyola401 on 23 October.
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B. napus
