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20162
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Subject: Seed Science and Production Technology × End date: 2016 × Start date: 2014 ×
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    ThesisItemOpen Access
    Prediction of Field Performance and Storability of Groundnut (Arachis hypogaea L.) Seed Lots Through Vigour Tests
    (University of Agricultural Science, Dharwad, 2016-06) Smayli Rana; Biradarpatil, N.K.
    Study was conducted to predict field performance and storability of groundnut (Arachis hypogaea L.) seed lots through vigour tests in the Seed Quality Research Laboratory of National Seed Project, University of Agricultural Sciences, Dharwad. Twenty groundnut seed lots with varied vigour levels based on different germination percentages were used. The data was analysed through CRD and RCBD design for laboratory and field data along with correlation and regression. Vigour tests were conducted and significant differences were found among the lots based on vigour levels. Significant correlation among the vigour tests was found with highest correlation of seedling vigour index (r = 0.991) followed by accelerated ageing test (r = 0.913), electrical conductivity test (r = 0.893) and mean germination time (r = 0.836) with germination test. In field, growth parameters i.e. speed of emergence, field emergence, plant population per plot, plant height at 30 and 60 days after sowing and number of leaves per plant varied significantly as influenced by vigour levels and vigorous seed lots had significantly higher growth as well as seed parameters i.e. pod yield per meter square, pod yield per hectare and shelling percentage. Significant correlation was observed among laboratory and field parameters. Higher pod yield among vigorous seed lots was attributed to higher speed of emergence, field emergence and plant population per plot based on regression analysis. General decline in seed quality parameters i.e. germination, root length, shoot length, seedling dry weight, seedling vigour index, protein content and oil content was observed. However, an increase in electrical conductivity and lipase activity was found and vigorous seed lots retained higher quality parameters during storage. The radicle emergence test also gave significant results in both laboratory and field studies. Among vigour tests, electrical conductivity test could be used to predict storability of seed lots with similar germination.
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    ThesisItemOpen Access
    Studies on Effect of Plant Growth Regulators on Seed Yield, Quality and Storability of Single Cross Maize Hybrid GH-0727
    (University of Agricultural Science, Dharwad, 2016-06) Govinda; Jolli, R.B.
    A field and laboratory experiments were conducted during kharif 2015 to study the influence of growth regulators on field performance, seed quality and storability of maize hybrid GH-0727 at Saidapur unit, Main Agriculture Research Station and at the Seed Quality and Research Laboratory, National Seed Project (NSP), Dharwad respectively. The experiment was laid out in randomized complete block design and replicated thrice with nine treatments viz., Control, GA3 (50 ppm), IBA (100 ppm), GA3 (50 ppm) + IBA (100 ppm), GA3 (75 ppm) + IBA (125 ppm), mepiquat chloride (200 ppm), mepiquat chloride (300 ppm), Salicylic acid (1mM) and (1.5mM). Among the treatments, application of GA3 (50 ppm) + IBA (100 ppm) recorded significantly higher plant height at maturity (203.33 cm ), less number of days to 50 % tasseling (53), silking (57.33) and days to maturity (118). Similarly higher number of seeds per row (29.33), test weight (28.06 g), seed yield per hectare (24.87 q) and shelling percentage (83.66) were recorded. Also significantly higher germination percentage (98.30), root length (22.52 cm), shoot length (12.86 cm) and seedling vigour index (3478) were also recorded. The harvested seeds were stored for six months to study the influence of these treatments on seed quality and storability. Among the treatments application of GA3 (50 ppm) + IBA (100 ppm) recorded significantly higher seed quality parameters followed by GA3 (75 ppm) + IBA (125 ppm) at 1st and 2nd month of storage period. Among containers, seeds stored in HDPE bag (700-800 gauge) maintained satisfactory seed quality as per the minimum seed certification standards up to six months of storage period.