Lokanath H.Udaya Kumar2019-09-232019-09-232015-12http://krishikosh.egranth.ac.in/handle/1/5810129031A field experiment was conducted at MARS, Dharwad in medium black clay soil during summer season 2014 under irrigated situation. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications to study the productivity of sesame (Sesamum indicum L.) as influenced by ratios and levels of nitrogen and phosphorus during summer. Sesame cultivar DS 5 was raised with twelve ratios and levels of nitrogen (N) and phosphorus (P2O5) fertilizers at a constant potassium fertilizer rate (25 kg K2O ha-1). The treatment receiving N/P fertilizer ratio of 1.60 with the split application of nitrogen favourably influenced yield and yield parameters of sesame. The treatment receiving N/P fertilizer ratio of 1.60 with the split application of nitrogen resulted in more number of capsules plant-1 (70.7), capsule weight (0.412 g), number of seeds capsule-1 (74.0), seed weight capsule-1 (0.213 g), seed weight plant-1 (12.223 g), 1000 seed weight (3.731 g), threshing percentage (51.22), seed yield (2037 kg ha-1), stalk yield (4339 kg ha-1) and harvest index (0.32) over treatment receiving N/P fertilizer ratio of 1.60 without split application of nitrogen and other treatments. Split application of nitrogen in the treatments which received N/P fertilizer ratios of 0.78, 2.00, 2.40 and 3.00 also found advantages in improving yield components of sesame. Treatment receiving N/P fertilizer ratio of 1.60 with the split application of nitrogen produced highest oil yield (923 kg ha-1) over rest of the treatments. The treatment which received N/P fertilizer ratio of 2.00 (50 N, 25 P2O5 and 25 K2O kg ha-1) resulted in higher uptake of nutrients (128.31 N, 23.54 P2O5 and 25.38 kg K2O kg ha-1) N/P fertilizer ratio of 1.60 (40 kg N, 25 kg P2O5, 25 kg K2O ha-1) with split application of N fertilizer) resulted in higher net monetary returns (74,711 Rs ha-1) over other fertilizer management practices.ennullThesis