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The present investigation entitled “Studies on response of nitrogen levels on growth, yield and N use efficiency of different rice cultivars in Vertisol” was conducted, during kharif season, of 2019 at the research cum instructional farm, of Indira Gandhi krishiVishwavidyalaya, Raipur, Chhattisgarh. Field experiment was laid down,in split-plot design and treatments allocated randomly nitrogen levels (N0, N50 and N100 kg ha-1 in main plots and in sub plots 10 rice cultivarsViz; CNN-1,CNN-2, CNN-3,CNN-4, CNN-5, RASI, MTU-1010, BCV-1, VARDHAN, TI93 and replicated thrice.“Soil and plant samples were collected yield and yield attributing characteristics of rice crop and analyzed various physico chemical properties of soil.” “The experimentalsoil was clayey in texture with pH (7.3), EC (0.42 ds m-1), OC (0.49 %), available N (144 kg/ha-1), available P (13.26 kg/ha-1) and available K (372kg/ha-1). Results of field experiment shown that yield and yield contributing characters of different rice varieties were significantly impacted by levels of applied nitrogen, grain and straw yield ranged from 29.99 to 54.09 q ha-1& 40.31 to 61.14 q ha-1 from control (N0) to applied 100 kg N ha-1 respectively. Among the different rice varieties BCV-1 produced highest grain and straw yield (54.86 and 66.75 q ha-1) and lowest (44.89 and 35.39 q ha-1)was found under TI93 cultivar respectively. “ “The number of tillers m-2, number of panicles m-2, grains panicle-1, and test weight” were found highest in rice variety BCV-1(404.56, 292.22, 211.78, 25.95) followed by VARDHAN (398.44, 281.67, 201.67, 24.67) under applied 100 kg N ha-1 and lowest found under cultivar TI93 (365.56, 215.56, 149.33, 16.64), respectively. Nitrogen, Phosphorus&Potassium content in grain and straw of rice cultivars were found non-significant with levels of applied nitrogen.” “Nitrogen levels showed significant effect on N, P and K uptake by rice cultivars. The highest nitrogen, phosphorus and potassium uptake (kg ha-1) wasrecorded by rice cultivar BCV-1, (92.29, 16.72 & 119.85 kg ha-1) and the lowest found under cultivar TI93 (45.44, 8.14, 71.40 kg ha-1) under 100 kg of applied N ha-1.Incresed nutrient uptakedue to higher nutrient availability which resulted in higher dry mass production and yield parameters of rice crop.” “The overall efficiency of nitrogen uptake (%), agronomic efficiency of N (kg grain kg-1 N) and physiological efficiency, (kg biomass kg-1 N uptake) decreased with increasing levels of applied nitrogen from 50 to 100 kg N ha-1. Among the rice cultivars, highest NUE (%) 42.14 was recorded by MTU-1010 and the lowest 22.96 by CNN-2 respectively. Highest agronomic N use efficiency 25.61 kg grain kg-1 N and lowest 15.26 kg grain kg-1 Nwereobtained by rice cultivars CNN-3 and TI93, respectively. Highest physiological efficiency 121.09 and lowest 65.72 kg biomass kg-1N uptake were recorded by rice cultivars CNN-2 and MTU-1010 respectively. “ “In post harvest analysed soil samples after rice crop,soil pH, EC and organic carbon were not significantly influenced with levels of applied nitrogen, whereas the available nitrogen, phosphorus and potassium in soil increased significantly over control. The highest available N,(201 kg ha-1), available P,(15.13 kg ha-1) and available K,(487.68 kg ha-1) were observed under 100 kg N ha-1 level of applied nitrogen. Different cultivars of rice did not show any significant effect with respect to changes in pH, EC and organic carbon, available nitrogen, phosphorus and potassium in soil.” “As per the above findings, 100 kg N ha-1 level of applied nitrogen performed best yield and growth parameters of rice cultivars and among different rice cultivars, BCV-1 produced maximum yield followed by VARDHAN, MTU-1010, CNN-1 and CNN5.

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