Response of potato genotypes to different levels of nitrogen

The present study was carried out to evaluate response of potato genotypes to different levels of nitrogen at fruit and vegetable nursery, Department of Horticulture, The University of Azad Jammu and Kashmir-Pakistan during the cropping season 2014.The experiment was laid out in Randomized Complete Block (RCB) Design with split plot arrangement, consisting of nitrogen levels and potato genotypes.There were five levels of nitrogen i.e. (0, 80, 100, 120 & 140 kg N ha -1 ) and three potato genotypes viz., Ronaldo, Senna red and HZD 00-112.The data was collected for different growth and yield parameters at each and every level of nitrogen.The highest significant values for most of the traits studied were recorded at 120 kg ha -1 nitrogen Genotype Ronaldo have maximum survival% age (80.44%), plant population (12.07 %), number of leaves plant -1 (176.81),plant leaf area (8.36 cm 2 ), number of branches plant -1 (59.45), plant height (52.56 cm), number of tuber plant -1 (8.03), tuber diameter (4.56 cm), average weight of tuber plant -1 (375.07g), and yield of tuber plot -1 (22.80-ton ha -1 ).Potato variety Ronaldo has given the highest yield (27.85 tones ha -1 ).Based on the results of the present study, it is recommended that application of nitrogen at 120 kg ha -1 can enhance over all productivity of potato under prevailing environmental conditions of Rawalakot, Kashmir-Pakistan.