Batra, V.K.Pooja Rani2019-05-302019-05-302019http://krishikosh.egranth.ac.in/handle/1/5810105574The field experiment was conducted during Rabi season of 2016-17 and 2017-18 at Research Farm of the Department of Vegetable Science, CCS Haryana Agricultural University, Hisar to study the effect of drip irrigation and nitrogen fertigation on growth, yield and quality of onion. The experiment was laid out in a Split Plot Design with sixteen treatment combinations comprised of four levels of drip irrigation (60, 80, 100 and 120% CPE) as main plots and four levels of nitrogen fertigation (75, 100, 125 and 150 kg/ha) as sub plots and one control treatment replicated thrice. The seven to eight week old seedlings of onion cv. Hisar Onion 4 were transplanted at 15 x 10 cm spacing during the first week of January in both years The growth parameters, i.e., plant height, number of leaves per plant, leaf length and days to maturity were recorded maximum under drip irrigation at 120% CPE as compared to other levels of drip irrigation, whereas the all yield and quality parameters were recorded maximum with drip irrigation at 100% CPE as compared to other levels of irrigation except that neck thickness, fresh and dry weight of leaves, split bulbs, bolting percentage and unmarketable bulb yield. However, maximum water use efficiency (59.20 and 60.60 kg/ha/mm) was recorded with the drip irrigation 60% CPE as compared to other high levels of drip irrigation. Among the different levels of nitrogen fertigation, all growth parameters were observed maximum with 150 kg/ha nitrogen fertigation as compared to other levels of nitrogen fertigation. Yield and quality parameters were recorded higher under 125 kg/ha nitrogen fertigation, whereas nitrogen use efficiency (263.53 and 259.80 kg/ha, resp.) was found highest with the fertigation of 75 kg nitrogen as compared to rest of fertigation treatments in both yea` Interaction of irrigation and nitrogen fertigation also significantly affected the almost all growth, yield and quality paramete` The highest benefit cost ratio (3.35 and 3.62) was obtained from drip irrigation at 100% CPE and 125 kg/ha nitrogen, while the lowest benefit cost ratio (1.60 and 1.61) was found at 60% CPE with 75 kg/ha nitrogen fertigation during both years, respectively.ennullThesis