Author(s):

Kamal Kant, Pradip K Bora, SG Telkar and Meghna Gogoi

Abstract: A field experiment was conducted the Research Farm of College of Post-Graduate Studies, Umiam, Meghalaya during kharif season of 2016 following Factorial Randomized Block Design with three replications. The soil of the experimental site was sandy clay loam soil in texture having pH 4.82, organic carbon 3.28%, Available N, P and K was 359.9, 17.6 and 196.4 kg ha^-1, respectively. Three rice cultivars (CAU-R1, Shahsarang1 and Lumpnah1) were grown with four nitrogen levels (60, 80, 100 and 120 kg N ha^-1) for the study. Shahsarang1 recorded significantly higher plant height over the CAU-R1 and at par with Lumpnah1. Shahsarang1 was significantly more tillers per hill over Lumpnah1 and at par with CAU-R1 at 90 DAT and at harvest. The dry weight of Shahsarang1 showed significant superiority at 90 DAT and at harvest over others. Leaf area and leaf area index of Shahsarang1 was significantly superiority over CAU-R1 at all the stages and at par with Lumpnah1 at 90 DAT. Shahsarang1 recorded maximum panicle length over Lumpnah1 and at par with CAU-R1. Test weight was maximum in CAU-R1 which was significantly higher over Shahsarang1 and at par with Lumpnah1. Highest grain yield and biological yield were obtained from Shahsarang1 which was significantly superior over Lumpnah1 and CAU-R1, Grain yield of CAU-R1 was at par with Shahsarang1. At 30 DAT and 60 DAT, 120 kg N ha^-1 showed significantly higher leaf area over the 60 and 80 kg N ha^-1 and at par with 100 kg N ha^-1. However, most of the growth parameters had not shown statistically significant difference but increased with each level of nitrogen resulting increase in plant height, tillers hill^-1, leaf area, leaf area index and dry matter production, higher values were recorded at 120 kg N ha^-1 compared to 60 kg N ha^-1. Number of filled grain panicle^-1 was highest at 120 kg N ha^-1 which was significantly superior over 60 kg N ha^-1. However, Nitrogen level 120 kg ha^-1 at par with 100 and 80 kg N ha^-1.

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