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Subject: Agriculture × End date: 1991 × Start date: 1991 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Evaluation of selections and hybrids of Vetiver (Vetiveria zizanioides (Lin n .) Nash.)
    (Department of Agricultural Botany, College of Horticulture, Vellanikkara, 1991) Radhakrishnan, G R; KAU; Viswanathan, T V
    Investigations on evaluation of selections and hybrids of vetiver Vetiveria zizanioides (Linn.) Nash, were undertaken using 9 cultivars of vetiver including 5 national collections, 3 hybrids and one South Indian type (ODV-3) . The observations on root characters revealed the superiority of ODV-3 in almost all root characters except root diameter. National collections had roots with maximum diameter. Hybrid 8 was also found superior in root characters. Shoot weight was the highest in ODV-3. No significant difference was observed among the different treatments with respect to shoot root ratio. National collection, in general produced highest percentage of oil per 100 g root especially NC 66415 and NC 66403 whereas ODV-3 produced the lowest percentage of oil. Hybrid 8, had maximum oil yield on per hectare basis. Studies on physico-chemical properties revealed that national collections had in general high specific gravity, refractive index and optical rotation. Oil from national collections was found laevo- rotatory whereas ODV-3 had dextro-rotatory oil. Acid value was higher in hybrids. Ester content, ester value and total vetiverol were higher in national collections. ODV-3 also had high total vetiverol. GLC studies revealed the superiority of NC 66416 with respect to oil quality. It had high vetiverol, vetiverone and low terpene content. Vetiverol was maximum in ODV-3 but had minimum vetiverone in its oil. Hybrid 8 was also found superior with maximum vetiverone content and fairly high content of vetiverol. But terpene content was higher it. Results of the experiment in pots showed that crops had better performance in pot condition with respect to almost all characters, but for oil content. . The observations on plant morphology indicated no clear- cut morphological features employable for exact identification of hybrids, North Indian and South' Indian types. However, data on root characters had shown that the South Indian types had in general long roots with maximum number and weight, than national collections. Root diameter in South Indian types was less. Performance of hybrids was better than national collections.
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    ThesisItemOpen Access
    Variability in inter varietal hybrids and open pollinated seed progenies of black pepper ( Piper nigrum L .)
    (Department of Agricultural Botany, College of Horticulture, Vellanikkara, 1991) Sujatha, R; KAU; Narayanan Namboodiri, K M
    The experiment was conducted at Pepper Research Station,Panniyur and College of Horticulture, Vellanikkara during 1989-90 to study the variability in F hybrids and open pollinated seed progenies of black pepper ( Piper nigrum L.). Fourty five intervarietal F hybrids and 492 open pollinated seed progenies of 1982-83 plantings maintained at the Pepper Research Station, Panniyur were included in the study. Observations on four qualitative and 21 quantitative characters were made from all the available hybrids and open pollinated seed progenies for one season. The data thus obtained were interpreted suitably, after subjecting them to appropriate statistical analyses. Considerable variation was present for both vegetative and reproductive characters in parents, F^ hybrids and open pollinated seed progenies. However, variability did not follow a uniform pattern in these three groups for the various characters. High positive correlation with yield was shown by several characters viz., green spike yield per vine, green berry yield per vine, number of spikes per vine, length of spike, developed berries per spike and thickness of orthotrope node and internode. The path analysis identified number of spikes per vine, length of spike and developed berries per spike as the most important characters influencing yield in the crop. Significant heterosis for important yield related characters viz., number of spikes per vine, length of spike and developed berries for spike was shown by certain hybrids.