EFFECT OF PLANTING DATE ON POTAT VARIETIES IN IRAN; A CASE STUDY FROM MASHHADShabnam Roshanil, Kiumars Bakhsh Kelarastaghibrahirn Amiri and Kourosh Shojaei Noterest
In order to define the suitable planting date in the potato yield varieties (Agria, Almera, and Sante), a field experiment was conducted in Mashhed area in 2008. The experiment was laid out in a split plot design with three replications. Planting date (9 and 30 May, 20 June and 11 July) was the main plot, and varieties in subplot. The planting date has a significant effect in the statistical level of 1% on the yield of potato. Also the planting date factor affected the height and percent of dry materiel in statistical level of 1% significantly. Varieties are very significant about the Yield of tuber, total number of tubers, the dry material organ and tuber, dry matter of the tuber and height of the tuber, in statistical level of 1% although varieties show important differences in the yield in different dates but this is mostly connected to planting date, and this is probably a reaction for temperature changes and day length during the growth season. Yield increase in some varieties is because of bigger tubers and more weight in the other varieties. Results concluded during the experiment yielded that planting dates 30 May and 20 June and Almera variety because of having the highest yield are considered as a recommendation in potato tilling in Mashhad, Iran.
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