~ 113 ~ Journal of Pharmacognosy and Phytochemistry 2019; SP1: 113-117 E-ISSN: 2278-4136 P-ISSN: 2349-8234 JPP 2019; SP1: 113-117 Roop Singh Dangi Department of Agronomy, Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya, Gwalior, Madhya Pradesh, India SP Singh ICAR-Central Potato Research Institute-RS, Gwalior, Madhya Pradesh, India Dharmendra Gaur Department of Agronomy, Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya, Gwalior, Madhya Pradesh, India JP Dixit Department of Agronomy, Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya, Gwalior, Madhya Pradesh, India SK Sharma ICAR-Central Potato Research Institute-RS, Gwalior, Madhya Pradesh, India Neelam Singh Department of Agronomy, Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya, Gwalior, Madhya Pradesh, India Neha Singh Kirar Department of Agronomy, Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya, Gwalior, Madhya Pradesh, India Rahul Patidar Department of Agronomy, Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya, Gwalior, Madhya Pradesh, India Correspondence Roop Singh Dangi Department of Agronomy, Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya, Gwalior, Madhya Pradesh, India (Special Issue- 1) 2 nd International Conference “Food Security, Nutrition and Sustainable Agriculture - Emerging Technologies” (February 14-16, 2019) Effect of nitrogen levels, cultural practices and their interactions on growth and yield attributes and yield of potato (Solanum tuberosum L.) Roop Singh Dangi, SP Singh, Dharmendra Gaur, JP Dixit, SK Sharma, Neelam Singh, Neha Singh Kirar and Rahul Patidar Abstract A field experiment, entitled “Effect of nitrogen levels, cultural practices and their interactions on growth and yield attributes and yield of potato (Solanum tuberosum L.)” was conducted at the Research Farm of ICAR-Central Potato Research Institute-RS, Gwalior (M.P.) during Rabi season of 2016-17 on silty clay loam soil having 0.29% organic carbon, 160.25 kg available N, 24.35 kg available P, 270.01 kg available K/ha and pH 6.3. The experiment was laid out in split plot design with 8 treatment combinations replicated three times. The treatment combination consists of 2 cultural operations and 4 nitrogen levels. Heat tolerant potato variety “Kufri Surya” was planted using seed rate of 3000 kg/ha. Planting was done at an inter row spacing of 60 cm apart and intra row spacing was kept at 20 cm apart. Basal dose was applied as per treatment through Urea, SSP and MOP in each treatment. The crop was planted on 24 th October 2016 and harvested on 4 th February 2017. The results revealed that application of 225 kg nitrogen/ha recorded significantly higher haulm fresh weight (377 g/5 plant), haulm dry weight (34.33 g/5 plant), number of green tubers {(< 25 g- 34/plot and total-103/plot)}, number of total tubers (< 25g - 91.5/plot, 50-75 g-51.8/plot). Similarly normal tuber yield (>75 g-11.11 kg/plot), green tuber yield-7.07 kg/plot as well as total tuber yield (>75 g-16.03 kg/plot) in addition to fresh tuber, available P in soil. However, chlorophyll content, AGR (g/day), RGR (g/g/day) were recorded non-significant in all treatments. On the other hand interaction of N2H1, N0H0, N1H0 and N1H1 recorded significantly higher value under available nutrient P (60.08 kg/ha), available nutrient N (178 kg/ha) and K (386.77 kg/ha), tuber dry production at 30 DAS (16.69 g) and haulm fresh weight (1183.33g/ 5 plant) at harvest, respectively. Hence, under non- hoeing condition application of 225 kg N/ha and under hoeing situation 150kg N/ha are desirable doses. Keywords: Cultural practices, available nutrient, nitrogen levels, AGR, RGR and chlorophyll Introduction Potato (Solanum tuberosum L.) is starchy, tuberous and contributes substantially towards food and nutritional security in the world. The current global production of potato is around 453.43 million tonnes and China being the biggest producer globally. India ranks 2 nd in area and production of potato in the world after China which contribute 11 per cent of world potato production (FAO STAT, 2014) [7] . In India, potato production is mainly confined to Uttar Pradesh, West Bengal, Bihar, Madhya Pradesh, Gujarat, Punjab, Assam and Haryana. More than 90% potato crop is grown in winter season under assured irrigation condition from October to March. In India, it is grown on an area of 2 million hectares with the production of 44.3 million tonnes and the productivity is 21967 kg ha -1 (Anonymous, 2015) [1] . In Madhya Pradesh, area under the crop during 2014-15 was 111.06 thousand hectares, with production and productivity of 2425 thousand tones and 21116 kg ha -1 , respectively and Madhya Pradesh was at 6 th position with 21116 kg ha -1 (Agricultural Statistics at a Glance, 2015). Potato is very sensitive crop to nitrogen fertilization. Excess nitrogen may prolong the vegetative phase and thus, interfere with the initiation of tuberization, decreasing yield and dry