Influence of nitrogen levels on productivity of potato (Solanum tuberosum L.) cultivars

The experiment was established to define the response of two potato cultivars (Marabel and Madeleine) to four different nitrogen levels (N0 , N90, N180 and N270 kg ha-1 ) in 2020 growing season. It was determined that the significant differences between the potato cultivars for number of tubers per plant, tuber yield and dry matter content. Marabel cultivar gave the highest number of tubers (5.62 no. plant-1 ), tuber yield (122.90 kg ha-1 ) and dray matter (% 21.85). All the investigated characteristics (number of tubers per plant, average tuber weight, tuber yield, dry matter, canopy temperature, leaf chlorophyll content and leaf area index) were significantly affected by nitrogen levels. With increasing nitrogen levels, leaf chlorophyll content and leaf area index were increased but plant canopy temperature was decreased. N180 treatment gave the highest tuber yield (142.93 kg ha-1 ) and dry matter (% 25.44)