Abstract
A field experiment was conducted in a private potato farm in Mosul city during two spring seasons of 2002 and 2003 to study the effect of two plant spacing between plants ( 15,30 cm ) and cutting the tubers in different parts weights ( hall tubers 50-60 gr. , half small tuber 25-30 gr , half large tuber 75-85 gr ., Large tuber 50-56 gr . and quarter large tuber 37.5 – 42.5 gr )In growth and yield of potato Cv. Disearee .The result can be summarized as follows :Planting at 30 cm between plants caused a significant increased in number of stem , wet and dry weight of plant , plant yield , and number of tubers per plant, however planting at 15 cm increased significantly plant height and total yield. Cutting the tubers to different parts weights increased significantly number of stems , wet and dry weigh of plant, plant yield , number of tuber per plant ,tuber weight and total yield when increasing the weigh of tuber part . The interaction between plant spacing and tubers cutting showed a significantly effect on some characters studying ,