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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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20221
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Subject: Nematology × Start date: 2022 × Type: Thesis × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    EXPLORATION AND EVALUATION OF BIOPROTECTIVE RHIZOSPHERIC MICROORGANISMS AGAINST MELOIDOGYNE GRAMINICOLA
    (2022) Jena, Rupak; Choudhury, B. N.
    Eighteen bacterial strains and eleven fungal strains were isolated from rhizosphere of different crops like rice, okra, ash gourd, chili, beans, cucumber from diverse conditions and soil types in and around Jorhat. The biochemical characterization of the isolated bacterial strains disclosed that six bacterial isolates tested negative for KOH test while twelve tested positive. All the bacterial strains exhibited positivity for gelatin hydrolysis and catalase test. Seven bacteria showed positive while eleven showed negative reaction to citrate test. Morphological findings stated that six bacterial strains were gram positive while twelve stained negatively, fifteen bacteria were rod shaped, two were coccus and one diplococcus in shape and all the bacterial isolates exhibited motility. The study of in vitro efficacy of the twenty nine bacterial and fungal isolates tested against second stage juveniles of M. graminicola revealed that all the bacterial and fungal isolates potentially impacted the test organism and caused significant mortality over sterile water treatment. The promising bacterial and fungal isolates were identified as BSH8, BTS4, BTS5, BJA15, FJB 11 and FSH5. The best result on mortality was exhibited by BSH8 with 80.79% mortality over J2 of M. graminicola. The effective and promising bio agents were identified using the 16 S rRNA sequencing and the organisms were Bacillis subtils (BSH8), Bacillus velezensis (BTS4), Alcaligenes faecalis (BTS5), Rhizobium pusense (BJA15), Talaromyces allahabadensis (FSH5) and Trichoderma asperellum (FJB11). In the pot experiment seventeen treatments were formulated using five potential isolates (3 bacteria, 2 fungi) either alone or in various compatible combinations. All the treatments showed significant results over the untreated control. The isolates improved the overall plant biomass and reduced the nematode reproduction and final population over control. The combined application of B. subtilis as seedling root dip + B. velezensis as soil treatment + T. asperellum as soil treatment @ 1x108 cfu/ml exhibited the maximum impact on plant morphological parameters viz., root length, shoot length, fresh and dry weight of root and shoot and inhibited the nematode population by decreasing the number of galls, egg masses and eggs/egg masses. The next best treatment was seedling root dip with B. subtilis+ soil treatment with T. asperellum and seedling root dip with B. velezensis + soil treatment with T. asperellum @ 1x108 cfu/ml.