Abstract
The experiment was conducted at Kanipanka nursery,Directorate of Agriculture in Sulaimani,Iraq ,during the fall season in order to study the effect of two potato seed sources ; imported and locally produced , two cultivars ; Desiree A and Desiree E in addition to Margarita cultivar on vegetative growth and yield . Factorial experiment using Randomized Complete Block Design (RCBD) with three replicates was applied and the means were compared acoording to L.S.D. at 5%. The results showed the dominance of seeds produced in spring to those imported with regard to : percent of dry matter in vegetative growth , number of aerial stems per plant in ratios of 22.69% and 19.94% successively as well as 40.48%, 40.0 % and 44.92% for tuber wieght , yield per plant and total yield per dounm alternatively . On the other hand, imported potato seeds were dominant significantly to those produced in spring season with respect to height of plants , marketable yield per dounm and protein percent in tubers with ratios 41.59%, 43.78% and 7.23% respctively. As far as cultivars are concerned ; Desiree E was dominant to both Desiree A and Margarita with regard to plant height,number of stemes per plant , weight of tubers , yield per plant ,marketable yield and total yield in ratios : 22.9% , 21.65%, 34. 34%, 34.34%, 4.49%, 22.01%, 13.33% ,46.66%, 1.93%, 45.16% , 19.90% and 51.65% successively .However with regard to the effect of cultivars on some qualitative characteristics, Desiree A was superior to Desiree E and Margarita cultivar with regard to the following : percent of dry matter ,starch and protein in tubers in ratios : 3.0% , 6.74% , 2.39%, 5.37%, 4.12% and 7.65% respectively. Finally the study showed superiority of spring produced potato seeds for most characteristics compared to Desiree E and it is more convenient for fall cultivation in Sulaimani district.
