Determination of the Best Planting Date for Spring-type of Rapeseed Cultivars in Mild Cold Climatic Conditions of Mashhad.
2009
A`zizi, Mahdi | Mohammad Pur, Hadi
In order to determining the proper planting date of cold tolerant spring type cultivars of rapeseed, a two year experiment was done in Toroq Agriculture and Natural Resources Research Center of Mashhad during 2005-2007 growing season. In this experiment seven planting dates with one month intervals from 23 Sept. to 23 May , were studied.Two cultivars namely, Hyola401 and RGS003 were set as main plots and planting dates as sub plots in a split plot design, with four replications. plant growth stages from emergence to physiological maturity was recorded. Economic yield and yield components , ie. 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 specially in 23 Sept. and 23 Oct. planting dates.Planting of this cultivar on 25 Feb.as a spring type 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 the presence of reproductive stages at the end of fall is probable, it is recommended that farmers cultivate the Hyola401 on 23 October.
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