Browsing by Author "Devika, R"

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    Effect of pre-soaking on germination, growth and yield of first crop (drysown) rice varieties of Onattukara
    (Department of Agricultural Botany, College of Agriculture, Vellayani, 1983) Devika, R; Gopinathan Nair, N
    The effect of pre-soaking and irrigation on germination, seedling mortality, growth and yield of 1st crop rice varieties of Onattukara where drought exists during the early part of the 1st crop season was studied. Soil moisture had a positive influence on germination. The prevailing temperature had no significant influence on germination and seedling mortality. Irrigation significantly improved germination percentage, seedling survival, plant height, tiller production,LAI, plant dry weight, number of fully filled grains and 1000 grain weight indicating the existence of drought during the 1st crop season. Seed treatment significantly increased germination percentage, seedling survival, tiller production, LAI,, plant dry weight, number of fully filled grains, 1000 grain weight and reduced the number of unfilled grains. Thus it is found that the hardening treatment endowed the plants with the ability to withstand drought. Among the varieties Jaya was found to be superior in tiller formation, LAI, number of panicles/hill* number of fully filled grains/ hill and 1000 grain weight. It can be considered as a suitable variety for the 1st crop season in Onattukara.
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    Genetic analysis of bacterial blight (xanthomonas oryzae pv. oryzae ishiyama) resistance and yield in yice (oryza sativa L.)
    (. Department of Plant Breeding and Genetics, College of Agriculture, Vellayani, 2002) Devika, R; Sreekumar, S G
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    Genetic variability and correlation in short duration rice cultivars
    (Kerala Agricultural University, 1994) Ahmed Regina; Rema Bai, N; Devika, R; Joseph, C A
    In order to understand the nature and extent of variability and association of various quantitative characters with grain yield, a field experiment was conducted with 45 short duration rice genotypes at the Rice Research Station, Moncompu. The environmental influence on the different traits was evident from the phenotypic coefficient of variability being higher than the genotypic coefficient of variability. Characters such as plant height, flag leaf area, panicle exsertion, number of grains per panicle and grain yield exhibited moderate to high heritability and genetic advance. Grain yield was found to be positively correlated both at genotypic and phenotypic level with number of productive tiller's per hill, plant height, flag leaf area, panicle length anil number of grains per panicle.
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    Pavithra (MO 13) and Panchami (MO 14): Two gall midge resistant varieties of rice
    (Kerala Agricultural University, Vellanikara, 2003) Rema Bai, N; Devika, R; Leenakumary, S