~ 908 ~ International Journal of Chemical Studies 2018; 6(2): 908-911 P-ISSN: 2349–8528 E-ISSN: 2321–4902 IJCS 2018; 6(2): 908-911 © 2018 IJCS Received: 25-01-2018 Accepted: 28-02-2018 H Amarananjundeswara Aicrp on potato, Horticultural research and extension station hassan, Karnataka, India Prasad PS, Aicrp on potato, Horticultural research and extension station Hassan, Karnataka, India Soumya Shetty Aicrp on potato, Horticultural research and extension station Hassan, Karnataka, India Sandhya GC Aicrp on potato, Horticultural research and extension station Hassan, Karnataka, India Correspondence H Amarananjundeswara Aicrp on potato, Horticultural research and extension station Hassan, Karnataka, India Response of potato variety Kufri Jyoti to different levels of NPK and their cost economics in southern dry zone of Karnataka H Amarananjundeswara, Prasad PS, Soumya Shetty and Sandhya GC Abstract An experiment was conducted on standardization of site specific NPK requirements for potato variety Kufri Jyoti at HRES, Hassan for three years during Kharif season of 2015-18. The research was initiated with seven treatments viz., T1-RDF -50 per cent NPK, T2-RDF-100 per cent NPK, T3-RDF-150 per cent NPK, T4-without N, T5-without P, T6-without K and T7-without NPK as check. An experiment was laid out in RCBD with three replications by adopting 60 cm x 20 cm spacing. The fertilizers were applied based on the recommended dose of fertilizer of 75:75:100 kg NPK per ha with FYM at 25 tons per ha. The results indicated that, treatment with RDF at 150 per cent of NPK fertilizers resulted significantly highest total tuber yield of 15.86 t/ha with B: C ratio of 1.61 followed by RDF at 100 per cent NPK recorded 13.75 t/ha and B: C ratio of 1.49 as compared to other treatments. Therefore it was indicated that application of higher dose of 150 per cent NPK, crop was responded progressively in terms of producing highest tuber yield and net returns. Keywords: Kufri Jyoti, Kharif, NPK, Yield, B:C ratio Introduction Potato (Solanum tuberosum L.) belongs to family Solanaceae and is one of the most important vegetable cum starch supplying crop having high production per unit area and time. Potato is an underground tuber crop occupies prime position among the cash crops in India and it can fulfill the requirement of food for human consumption to a greater extent (Banjare et al., 2014) [1] . The growth, development and yield of potato is mainly governed by availability of major nutrients required for its cultivation. Therefore, supply of major nutrients play an vital role in growth and yield. However, inadequate and indiscriminate use of fertilizers can also be the main reason for the low yields in potato. Among the major nutrients, nitrogen is the first limiting factor for potato crop production and is an essential constituent of protein and chlorophyll pigment which improves vegetative growth and invariably increases yield, tubers per plant, tuber size as well as tuber numbers. Whereas, phosphorous nutrient contributes towards early crop development, tuberization and enhances tuber maturation. While, potassium element influences both yield and tuber quality, besides enhances plant resistance to withstand stress against drought and frost (Nizamuddin et al., 2003) [5] . Of different agronomic practices, the macro-nutrients management (especially N, P and K) is the most important factor for harnessing the full production potential of any potato cultivar (Kumar et al., 2004) [3] and use of balanced fertilizer is important for boosting up the yield. Also, the response of these macro-nutrients are known to vary considerably with variety and locality (Ravikant and Chadha, 2009) [6] . Therefore with this back ground the present study was initiated to standardize the N, P and K levels for maximizing the yield of potato variety Kufri Jyoti in southern dry zone of Karnataka. Materials and Methods An experiment was conducted on standardization of site specific NPK requirements for potato variety Kufri Jyoti at HRES, Hassan consecutively for three years during Kharif season of 2015-16, 2016-17 and 2017-18. The research was initiated with seven treatments viz., T1-RDF -50 per cent NPK, T2-RDF-100 per cent NPK, T3-RDF-150 per cent NPK, T4-without N, T5- without P, T6-without K and T7-without NPK as check. An experiment was laid out by using RCBD with three replications.