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20012
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Subject: Seed Science and Technology × Author: Patil ×
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    ThesisItemOpen Access
    STUDIES ON NIPPING OF AUXILIARY FLOWER RUDS AND MICRONUTRIENT APPLICATION ON SEED YIELD AND QUALITY OF SUNFLOWER RESTORER LINE. RHA-857
    (UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, DHARWAD, 2001) Patil; Shivashankaragouda Vyakaranahal, B S
    "Most of the restorer parents used in sunflower hybrid seed production are of multi branched with low productivity. To solve these constraints, an investigation on nipping of auxiliary flower buds and micronutrient application on seed yield and quality of sunflower restorer line, RHA-857 was carried out by conducting a field experiment at Main Research Station, University of Agricultural Sciences, Dharwad. The experiment was laid out in Randomized Block Design with factorial concept and consisted of two factors viz., nipping (2) and micronutrients application (5) and with one control (no nipping/no micronutrient). In restorer line, continuous nipping of auxiliary flower buds from 35 days after sowing (DAS) onwards recorded significantly higher yield and its attributes. Seed yield per hectare increased 65.8 per cent over control. The yield attributes like yield per plant, capitulum diameter, filled seed number, seed filling per cent, seed recovery per cent and 100 seed weight were also increased in this treatment. This was followed by nipping of side branches once at 55 DAS over control. Plant height and chlorophyll content in leaf were significantly higher in nipped plants, while higher dry matter was found in control plants. Seed quality parameters like germination percentage, rate of germination, root length, shoot length, vigour index, dry weight and oil content were significantly higher in the seeds of nipped plants over control. Among the micronutrient application, foliar spray of boron or ZnS04 @ 0.1% at ray floret stage (55 DAS) increased the seed yield by 38.2 and 18.0%, respectively over control. Similarly boron @ 2 kg/ha dusting at ray floret stage, ZnS04 @ 10 and 20 kg/ha through soil application also increased the seed yield by 27.3, 7.9 and 15.0%, respectively over control. Further, it is also observed that application of boron (0.1%) increased the capitulum diameter, filled seed number, seed weight per capitulum, seed set percentage, 100 seed weight, germination, rate of germination, root length, shoot length, vigour index, dry weight of seedling and oil content of seed. "
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    ThesisItemOpen Access
    SYNCHRONIZATION STUDIES IN PARENTAL LINES OF RICE HYBRIDS
    (UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, DHARWAD, 2001) Patil; Veeranagouda; Biradarpatil, N K
    "The field experiments were carried out at Main Research Station, Dharwad and Agricultural Research Station, Siruguppa during kharif 2000-01 on synchronization of flowering in parental lines of rice hybrids. Among the parental lines the restorer line KMR-3 required more effective accumulated temperature and produced more number of leaves, where as another restorer line IR9761-19-01 required less effective accumulated temperature and produced less number of leaves till 50 per cent flowering at both the locations. The maintainer line required less effective accumulated temperature and produced less number of leaves compared to their respective CMS lines. The growth duration and effective accumulated temperature requirement of the parental lines varied with locations, where as, the number of leaves produced by the parental lines was relatively stable. Hence, the leaf number difference method was found to be more reliable for adjusting the planting dates of parental lines at both the locations. The maintainer line (IR58025B) was early by 4.7 days in 50 per cent flowering than the female line (1R58025A). Sowing of maintainer line, five days later than the female line was found to achieve better synchronization and increased the seed yield by 45.3 per cent, over simultaneous planting (control). The foliar spray of gibberellic acid (100 ppm) or single super phosphate (1.0%) to female parent at panicle initiation enhanced the 50 per cent flowering by 3.4 and 2.4 days and increased the seed yield of female line by 46.1 and 29.4 per cent, respectively over control. Foliar spray of urea (2.0%) to maintainer line or jerking the seedling of maintainer line at panicle initiation delayed 50 per cent flowering by 2.7 and 2.0 days and increased the seed yield by 30.8 and 27.4 per cent, respectively over control. Spraying of gibberellic acid 100 ppm and simultaneous planting recorded significantly higher germination (93.3%), shoot length (12.6 cm), root length (12.7 cm), seedling dry weight (134.6 mg) and vigour index (2356) compared to all other treatments."