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2014 - 20153
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Subject: Forest Genetics Resources × End date: 2016 × Start date: 2014 ×
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    ThesisItemOpen Access
    CARBON SEQUESTRATION OF TEN YEAR OLD DIFFERENT TREE SPECIES PLANTED IN SHELTER BELT OF NORTHERN TRANSITIONAL ZONE OF KARNATAKA
    (University of Agricultural Sciences Dharwad, 2015-07) ARUNKUMAR ASHTAGI B; Dr. H. SHIVANNA
    The study was conducted at the college of Agricultural Hanumanammatti of Haveri District to assess the performance of ten year old shelterbelt trees with respect to girth, height, volume, biomass (above and below ground biomass) and carbon sequestration. Acacia auriculiformis, Azadirachta indica and Dalbergia sissoo were found to be superior over the other species with respect to growth performance. Acacia auriculiformis showed higher biomass production with higher above and below ground biomass of 103.19 ton/ha, 26.83 ton/ha at 120 months after planting respectively. At 132 months after planting (11 year old) above and below ground biomass production increased to 144.68 ton/ha, 37.62 ton/ha respectively; about 65.01 ton/ha and 91.15 ton/ha at 10 and 11 year old trees respectively in Acacia auriculiformis. Among the five tree species considered form factor ranged from 0.51 to 0.55. Highest tapering was observed in Pongamia pinnata followed by Tectona grandis and least was noticed in Acacia auriculiformis. This study suggests that Acacia auriculiformis, Azadirachta indica and Dalbergia sissoo, latter two species are preferred because of other advantages such as nitrogen fixation and traditional use as bio-pesticide.
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    ThesisItemOpen Access
    DOCUMENTATION OF PATHOGENIC SPECTRA OF FOREST NURSERY DISEASES AND THEIR MANAGEMENT IN HONNAVAR DIVISION OF CANARA CIRCLE
    (University of Agricultural Sciences Dharwad, 2015-06) NAGARJUN N; Dr. SURYANARAYANA V.
    Disease cause nursery damage by seedling mortality, premature defoliation, growth and vigor loss and stressing an attention of plant growers for effective management strategies. In this line, the investigations on “Documentation of pathogenic spectra of forest nursery diseases and their management in Honnavar Division of Canara Circle” was carried out at College of Forestry, Sirsi during 2013-2015. Disease survey in nine nurseries of Honnavar Forest Division revealed 52 diseases on 50 hosts. The major diseases were leaf spot, leaf blight, leaf rust, powdery mildew and tar spot. Tar spot of Dalbergia latifolia recorded highest Per cent Disease Index (PDI) of 67.53 per cent followed by leaf spot and blight of Pongamia pinnata (66.09%), leaf spot of Syzygium cumini (63.97%) and least was by leaf spot of Machilus macarantha (1.16%). Pathogenic spectra through tissue isolation of diseased samples showed 49 pathogens to cause 52 seedling diseases on 50 different hosts. Ten pathogens are new records viz., 4 leaf spot causing ones’ as Dothiorella lopopetalum sp.nov., Lopopetalum weightianum, Rhizosphaera madhuca sp.nov. in Madhuca indica; Readeriella syzygium sp.nov. in Syzygium lanceolata. Four leaf blight causing one’s as Hormocephalum calamae sp.nov in Calamus nagabettai; Coniothyrium dalbergia sp.nov. in Dalbergia latifolia, Microsphaeropsis pongamia sp.nov. in Pongamia pinnata, Rhizosphaera pterocarpus sp.nov. in Pterocarpus santalinus, Dothiorella swietenia sp.nov. in Swietania mahagoni and Rhizosphaeria tectonia sp.nov. in Tectona grandis. In in vivo nursery disease management with nine treatments, Carbendazim (0.1 %) was highly effective in controlling five diseases (leaf blight of Pterocarpus marsupium, Tectona grandis, Sweitania mahagoni, and leaf spot of Syzygium cumini and Terminalia alata) followed by 0.1 per cent Propiconazole (tar spot of Dalbergia latifolia, leaf blight of Pongamia pinnata); 0.1 per cent Difenconazole (leaf blight of Acacia auriculiformis and leaf and tip blight of Lagerstromia lanciolata) and 0.1 per cent Mancozeb (leaf blight of Pterocarpus santalinus).
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    ThesisItemOpen Access
    STUDIES ON SEED MOISTURE CONTENT, PRE-SOWING TREATMENTS AND STORAGE MEDIA AND CONTAINERS ON SEED GERMINATION AND SEEDLING QUALITY IN Garcinia gummi-gutta L.
    (University of Agricultural Sciences Dharwad, 2014-07) SHANKAR MAYANGLAMBAM; Dr. KRISHNA A.
    Garcinia gummi-gutta is one of the economically important recalcitrant species which is rich in Hydroxycitric acid (-HCA), an important biologically active plant metabolite used as an anti-obesity drug. Seeds of Garcinia gummi-gutta loose its viability within few days under natural conditions, when the seed moisture content reduces below a high critical value. Germination of this tree is also very poor and late. The present investigation was taken up in College of Forestry, Sirsi in 2013-2014 on Garcinia gummi-gutta in order to enhance the quality for better and quick germination. The maximum germination percent (34 per cent) and moisture content (41.97 per cent) was observed in freshly decoated seeds. The moisture content of 28.84 % was found to be critical moisture content for seeds, as below this germination was zero. The maximum mean daily germination (0.19), peak value (0.22) and germination value (0.04) was recorded in fresh decoated seeds. Out of eleven different pre-sowing treatments tried, the maximum germination percentage (86.33 per cent) was recorded in decoated seed treated with GA3 50 ppm for 12 hrs as compared to other treatments. The other higher quality indexes viz., mean daily germination (0.48), peak value (0.58), germination value (0.28), shoot length (13.33 cm), root length (13.43 cm), seedling height (26.76 cm), seedling dry weight (1.26 g) and seedling vigour index (2311) also recorded in this treatment. During six months of storage, the seeds stored in ash treatment recorded maximum germination at the first month of the storage and decline in germination was noticed with advancement in the storage period. Germination per cent in control was negligible after 3 months of storage. Among the all treatments the maximum germination percentage was maintained in pet jar upto sixth months of storage.