Thumbnail Image

University of Agricultural Sciences, Bengaluru

University of Agricultural Sciences Bangalore, a premier institution of agricultural education and research in the country, began as a small agricultural research farm in 1899 on 30 acres of land donated by Her Excellency Maharani Kempa Nanjammanni Vani Vilasa Sannidhiyavaru, the Regent of Mysore and appointed Dr. Lehmann, German Scientist to initiate research on soil crop response with a Laboratory in the Directorate of Agriculture. Later under the initiative of the Dewan of Mysore Sir M. Vishweshwaraiah, the Mysore Agriculture Residential School was established in 1913 at Hebbal which offered Licentiate in Agriculture and later offered a diploma programme in agriculture during 1920. The School was upgraded to Agriculture Collegein 1946 which offered four year degree programs in Agriculture. The Government of Mysore headed by Sri. S. Nijalingappa, the then Chief Minister, established the University of Agricultural Sciences on the pattern of Land Grant College system of USA and the University of Agricultural Sciences Act No. 22 was passed in Legislative Assembly in 1963. Dr. Zakir Hussain, the Vice President of India inaugurated the University on 21st August 1964.

Browse

20221
Reset filters
Subject: Nematology × End date: 2025 × Start date: 2020 × Type: Thesis ×
Reset filters

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    ThesisItemEmbargo
    STUDIES ON THE POLLINATOR FAUNA OF ONION (Allium cepa L.)
    (University of Agricultural Sciences GKVK, Bangalore, 2022-01-26) KAVYA, R.; JAGADISH, K. S.
    The study was carried at the Departments of Apiculture and Horticulture, UAS, GKVK, Bangalore during January-April, 2022. Onion (var. Arka Kalyan) plants started flowering during February, which was 42-52 days after bulb sowing. The peak flowering was observed in March. The inflorescence is umbellate-cyme. The umbel consisted of 346±141.5 small flowers, which were dull or creamy-white. The life span of the flower was about 4 days. The production of nectar was relatively highest in the morning 06:00-08:00hrs. (12.26±1.76μl) and it gradually decreased towards evening 16:00-18:00hrs. (0.76±0.08μl). Totally, 57 insect species visited the umbels, among them, 28 species belonged to the order Hymenoptera, nine species to order Diptera, eight species each belonged to orders Hemiptera and Lepidoptera, two species to order Coleoptera, one species each belonged to the orders Mantodea and Anisoptera. Among all the insect floral visitors, only seven Hymenopteran species foraged more frequently, they played a major role in pollination. The highest Shannon-Wiener diversity index was observed during 06:00-10:00hrs. in both the initial and peak blooming periods. Berger-Parker dominance index was higher in peak blooming period. A. dorsata was the most pre-dominant species, followed by A. florea, A. mellifera, T. iridipennis and A. cerana. Overall maximum time spent and highest flower visits was recorded during 08:00-10:00hrs. and 06:00-08:00hrs., respectively. Significantly higher quantitative and qualitative parameters of seed yield were recorded in the seeds obtained from open pollinated flowers (574.39kg/ha.), followed by plants enclosed with A. mellifera (519.69kg/ha.) and A. cerana (451.31kg/ha.) colony, as compared to other modes of pollination.