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Assam Agricultural University, Jorhat

Assam Agricultural University is the first institution of its kind in the whole of North-Eastern Region of India. The main goal of this institution is to produce globally competitive human resources in farm sectorand to carry out research in both conventional and frontier areas for production optimization as well as to disseminate the generated technologies as public good for benefitting the food growers/produces and traders involved in the sector while emphasizing on sustainability, equity and overall food security at household level. Genesis of AAU - The embryo of the agricultural research in the state of Assam was formed as early as 1897 with the establishment of the Upper Shillong Experimental Farm (now in Meghalaya) just after about a decade of creation of the agricultural department in 1882. However, the seeds of agricultural research in today’s Assam were sown in the dawn of the twentieth century with the establishment of two Rice Experimental Stations, one at Karimganj in Barak valley in 1913 and the other at Titabor in Brahmaputra valley in 1923. Subsequent to these research stations, a number of research stations were established to conduct research on important crops, more specifically, jute, pulses, oilseeds etc. The Assam Agricultural University was established on April 1, 1969 under The Assam Agricultural University Act, 1968’ with the mandate of imparting farm education, conduct research in agriculture and allied sciences and to effectively disseminate technologies so generated. Before establishment of the University, there were altogether 17 research schemes/projects in the state under the Department of Agriculture. By July 1973, all the research projects and 10 experimental farms were transferred by the Government of Assam to the AAU which already inherited the College of Agriculture and its farm at Barbheta, Jorhat and College of Veterinary Sciences at Khanapara, Guwahati. Subsequently, College of Community Science at Jorhat (1969), College of Fisheries at Raha (1988), Biswanath College of Agriculture at Biswanath Chariali (1988) and Lakhimpur College of Veterinary Science at Joyhing, North Lakhimpur (1988) were established. Presently, the University has three more colleges under its jurisdiction, viz., Sarat Chandra Singha College of Agriculture, Chapar, College of Horticulture, Nalbari & College of Sericulture, Titabar. Similarly, few more regional research stations at Shillongani, Diphu, Gossaigaon, Lakhimpur; and commodity research stations at Kahikuchi, Buralikson, Tinsukia, Kharua, Burnihat and Mandira were added to generate location and crop specific agricultural production packages.

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Subject: Nematology × Author: Bordoloi, Kankana × Start date: 2006 × Type: Thesis ×
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    ThesisItemOpen Access
    MECHANISM OF LANTANA CAMARA LEAF EXTRACTS IN THE MANAGEMENT OF MELOIDOGYNE INCOGNITA ON TOMATO
    (AAU, Jorhat, 2019-07) Bordoloi, Kankana; Bhagawati, B.
    An experiment was carried out on the mechanism of Lantana camara leaf extract in the management of Meloidogyne incognita on tomato. For this, leaf extract of L. camara (25gm/75ml w/v) were evaluated at 25, 50, 75 and 100 percent concentration through egg hatch inhibition and larval mortality test. The result of the in-vitro efficacy test showed that maximum egg hatch inhibition of M.incognita was recorded in the 100 percent concentration of L. camara leaf extract where as minimum was recorded in the 25percnet concentration after 7 days of exposure time. The maximum mortality of M. incognita J2was recorded in the 100 per cent concentration of L. camara leaf extract where as minimum was recorded in the 25 per cent concentration after 24, 48, 72 and 96 hours of exposure time. No mortality was recorded in the control treatment i.e. sterile distilled water. It was observed that there was an increasing trend in the mortality of J2 with increase in the concentration and time of exposure. Similarly, egg hatch inhibition was also found to be more with increase in the concentration. A pot experiment was conducted to explore the biochemical mechanism of leaf extracts of L. camara in the management of M. incognita on tomato. For this the activity of defence related enzymes viz., peroxidase (PO), polyphenoloxidase (PPO) and total phenol content were observed at 25,50,75 and 100 percent concentration of L. camara leaf extract after 35and 45 DAI of M .incognita in tomato. Among the different concentrations, highest activity of peroxidase (PO), polyphenoloxidase (PPO) and total phenol content was observed at 100 percent concentration while the minimum activity was recorded in the 25 percent concentration both after 35and 45 DAI. However, maximum activity of the biochemical compounds was recorded at 35 DAI while the same declined at45 DAI. The lower concentration of L. camara leaf extract viz., 25 and 50 percent showed stimulatory effect on plant growth parameter whereas higher concentrations viz., 75 and 100 percent concentration of L. camara leaf extract showed inhibitory effect on plant growth. The maximum plant growth parameter like shoot height, shoot weight (fresh) and root length and root weight (fresh), dry shoot weight were recorded in the 50 percent concentration of L. camara leaf extract where as the minimum was recorded in the nematode alone treatment. The minimum nematode multiplication like number of galls, number of eggmasses and final nematode population in soil were recorded in the 100 percent concentration of L. camara leaf extract followed by 75, 50 and 25 percent concentration.