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Subject: Agronomy × Author: Bahuguna, Anjali × End date: 2022 × Start date: 2020 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Agronomic evaluation of rice (Oryza sativa L.) genotypes under varying fertility levels
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2020-09) Bahuguna, Anjali; Singh, D.K.
    A field experiment was conducted during kharif season of 2019 at Crop Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar (Uttarakhand) for evaluation of six rice genotypes (IET-27263, IET-26418, IET-26420, NDR-359, PD-19 and PD-26) under varying fertility levels (Control, 100% RDF, 150% RDF). Treatments were tested in Split Plot Design with three replications keeping fertilizer levels in main plots and genotypes in sub plots. Different levels of fertilizer significantly influenced the grain, straw and biological yield of rice. Application of fertilizer at 150% RDF resulted in significantly higher grain and straw yield over all other fertilizer levels. Similarly, significant taller plants, more number of tillers m-2 at all stages of crop growth except at maturity, higher dry matter accumulation, more number of panicles m-2, more panicle length, higher grain weight panicle-1, total nitrogen, phosphorus and potassium uptake were also found to be increased significantly up to 150% RDF. However, application of fertilizer at 100% RDF resulted in higher partial factor productivity, agronomic efficiency, apparent recovery percentage and physiological efficiency of nutrients. While days taken to 50% flowering, 1000 grain weight and harvest index were not affected by the levels of fertilizer. The rice genotype IET-27263 produced highest grain, straw and biological yield over other genotypes. This genotype also recorded higher number of tillers m-2 at maturity, higher dry matter accumulation, more number of panicles m-2, maximum grain weight panicle-1 and highest 1000 grain weight which ultimately resulted in higher grain yield. Similarly, maximum uptake of N and K in grain and straw was also recorded in genotype IET-27263. It can be concluded that application of fertilizers at higher dose is essential for obtaining higher yield of rice as most of the parameters of growth, development and yield were responding well up to 150% RDF. The new rice genotype IET27263 was found superior to all other tested genotypes.