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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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20227
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End date: 2022 × Start date: 2022 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    STUDIES ON NON-CHEMICAL METHODS OF MANAGEMENT OF TEA PESTS AND USE OF PLANT BASED FORMULATIONS AGAINST RED SPIDER MITE
    (2022) Hazarika, Bidisha; Saikia, Gautam Kumar
    An investigation entitled “Studies on non-chemical methods for management of tea pests and use of plant based formulations against red spider mite” was carried out in the Experimental Garden for Plantation Crops (EGPC) and Department of Entomology, Assam Agricultural University, Jorhat during 2019-2021. The study was undertaken to survey non-chemical methods of management of red spider mite used by twenty small tea growers of Dibrugarh district of Assam and to study the efficacy of plant based formulations for management of red spider mite in-vitro. It was found that 45% of the small tea growers used cow urine with Ghora neem (Melia azedarach), Karanj (Pongamia glabra) and Pothorua bihlongoni Polygonum hydropiper combinations for management of red spider mite. Moreover, they also used bhoot jolokia (Capsicum chinense), sour curd, wheat flour in small quantities.
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    ThesisItemOpen Access
    STUDIES ON NON-CHEMICAL METHODS OF MANAGEMENT OF TEA PESTS AND USE OF OIL BASED FORMULATIONS AGAINST RED SPIDER MITE
    (2022) Konwar, Joyshree; Saikia, Gautam Kumar
    An investigation entitled “Studies on non-chemical methods for management of tea pests and use of oil based formulations against red spider mite” was carried out in the Experimental Garden for Plantation Crops (EGPC) and Department of Entomology, Assam Agricultural University, Jorhat during 2019-2021. The study was undertaken to survey non-chemical methods of management of red spider mite used by twenty (20) small tea growers of Sivasagar district of Assam and to study the efficacy of oil based formulations for management of red spider mite in-vitro. It was found in the survey that 50% of the tea growers used cow urine and water with Neem (Azadirachta indica), Pothorua bihlongoni (Polygonum hydropiper) and Karanj (Pongamia pinnata) combinations for management of red spider mite. Twenty percent (20%) of the tea growers used cow urine and water alone. Oil cake, cow dung, bhoot jolokia (Capsicum chinense), garlic (Allium sativum), limestone, curd and other ingredients were also used in small quantities. Home-made mustard and sesame oil were taken for laboratory experimentation on red spider mite, Oligonychus coffeae at 0.5%, 0.75% and 1% concentration alone or in combination with cow urine. Among the oil based treatment combinations, sesame oil 1% + cow urine 5% was found to be most effective for management of red spider mite. All the treatments of sesame oil were found to be effective in reducing rate of oviposition of red spider mite which were at par with commercial neem (1:1500). Egg hatchability was found to be reduced satisfactorily when the tea leaves were sprayed with sesame oil1% and sesame oil 1% + cow urine 5% and were at par with commercial neem. Sesame oil 0.75% + cow urine 5%, sesame oil 1% and sesame oil 1% + cow urine 5% were found to be effective for mortality of nymphs of red spider mite which were at par with commercial neem. Adult mortality was found to be at par with commercial neem when sprayed with sesame oil 0.75%, sesame oil 0.75% + cow urine 5%, sesame oil 1% and sesame oil 1% + cow urine 5%. From the present study, it can be concluded that the non-chemical methods which are prevalent among the tea growers if scanned, validated and standardized scientifically would definitely help in the management of tea pests. These pest control practices serve as an alternative to overcome the ill effects of synthetic chemical pesticides. Thus, studies on oil based formulations mixed with cow urine or without cow urine showed possible incorporation and utilization in tea IPM programme.
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    ThesisItemOpen Access
    IDENTIFICATION AND CHARACTERIZATION OF BACTERIAL PATHOGENS IN MEDICINAL, AROMATIC AND SPICE PLANTS OF ASSAM
    (AAU, Jorhat, 2022) GOGOI, MOUSUMI; Borah, P K
    Accumulated knowledge of medicinal, aromatic and spice plants from ancient times helps to improve human health and life from generation to generation. There is tremendous scope for the extensive development of these important plants. But different diseases cause considerable loss of these plants that result in substantial economic loss to farmers. Although bacterial diseases cause severe loss to different medicinal, aromatic and spice plants in different states of our country, not much work had been done on bacterial diseases of these crops in Assam including other Northeastern states. Therefore, the present study was made to isolate, characterize and identify some of the bacterial pathogens associated with diseases of medicinal, aromatic and spice plants in Assam. Disease samples from medicinal, aromatic and spice plants viz., Chilli (Capsicum annum), Ginger (Zingiber officinale), Coriander (Coriandrum sativum), Betelvine (Piper betle), Pennywort (Centella asiatica), Giloy (Tinospora cordifolia) and Cardamom (Elettaria cardamomum) were collected from Golaghat, Jorhat, Karbi Anglong and Nagaon district of Assam. On the basis of cultural, morphological and biochemical studies the seven bacterial isolates were identified as genus Xanthomonas (in Chilli, Coriander, Betelvine and Giloy), Pantoea (in Pennywort), Bacillus (in Ginger) and Pseudomonas (in Cardamom). Further molecular characterization and phylogenetic analysis were done to identify the different bacterial isolates i.e., isolate MGH1 GOLAGHAT as Xanthomonas axonopodis pv. vesicatoria (bacterial leaf spot of chilli), isolate MGH2 GOLAGHAT as Bacillus pumilus (rhizome rot of ginger), isolate MGH3 JORHAT as Xanthomonas campestris pv. coriandri (bacterial leaf spot of coriander), isolate MGH4 GOLAGHAT as Xanthomonas axonopodis (bacterial leaf spot of betelvine), isolate MGH5 JORHAT as Pantoea ananatis (bacterial leaf spot of pennywort), isolate MGH6 JORHAT as Xanthomonas campestris (bacterial leaf spot of giloy) and isolate MGH7 JORHAT as Pseudomonas oryzihabitans (bacterial blight of cardamom).
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    ThesisItemOpen Access
    EFFECT OF SEED COATING WITH VEGETABLE OILS ON SEED GERMINATION AND SEEDLING ESTABLISHMENT IN GREEN GRAM (Vigna radiata (L.) Wilczek) UNDER HIGH SOIL MOISTURE CONDITION
    (AAU, Jorhat, 2022) Jamir, Pursangla; Barua, Purna K.
    Green gram (Vigna radiata L. Wilczek) is an important pulse crop of India and is grown in almost all the states. India is the major producer of green gram in the world. In Assam, it is sown in two seasons, summer (February and March) and kharif (August-September). Kharif sowing generally coincides with the rainy season causing problem in seed germination and seedling establishment. Seed coating is a seed technological technique for enhancing germination and seedling establishment under a wide range of environmental conditions. The present study was carried out to study the effect of seed coating with linseed, castor and mustard oils on green gram seed quality in laboratory conditions and to evaluate the effect of seed coating with these vegetable oils on seedling establishment and crop performance in saturated soil moisture condition in the field. Each of the oils was applied @ 5 ml, 10 ml and 15 ml/kg seed by thorough mixing to impart seed coating. Mustard oil and castor oil treatments were found to improve the seed germination and vigour in the laboratory. In the field, under saturated soil conditions mustard oil and castor oil treatments enhanced field emergence percentage, seedling dry weight, plant height, pod clusters per plant, pods per plant, seeds per pod and seed yield per plant. Linseed oil @10 ml/kg and 15 ml/kg also showed promising performance for seedling dry weight, pod clusters per plant and seeds per pod. In field soil capacity soil condition, linseed and castor oil treatments significantly increased field emergence, plant height, number of branches per plant, pod clusters, seeds per pod and seed yield per plant.
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    ThesisItemOpen Access
    Bioformulation of entomopathogenic fungus against Helopeltis theivora Waterhouse (Hemiptera: Miridae)
    (AAU, Jorhat, 2022) Kaur, Priya; Das, Purnima
    Pathogenicity test of 5 strains or isolate of entomopathogens on adult Helopeltis theivora were carried out in the Physiology Laboratory, Department of Entomology, Assam Agricultural University, Jorhat during 2019-2021. Among the strains or isolate, Archips sp. isolate showed the best results at concentration 1x107 conidia/ml. The radial growth of Archips. sp isolatewas found to be 75.33 mm. At concentration 1x107 conidia/ml, the conidial density, germination and pathogenicity of Archips sp. isolate was 8.08x107 conidia/ml, 85.49% and 80%, respectively. Morphological characters of Archips sp. isolate were studied and its molecular characterization was carried out by using CP plant gDNA mini kit protocol and its accession no. was assigned as OM321438. While Archips sp. isolate when grown on liquid media supplemented with carbon, nitrogen and mineral sources (Glucose, Peptone and MgCl2), the medium supplemented with the mineral source- MgCl2 (0.75%) showed maximum conidial load (6.54x107 conidia/ml) and maximum germination (88.91%). Three talc-based formulations were prepared. One was prepared by using base material as harvested from PDB supplemented with 0.75% MgCl2, second with combination of all the nutrients (0.75% Glucose, 0.75% Peptone and 0.75% MgCl2) and third without nutrient. And among these formulations, all nutrients supplemented talc-based formulation showed maximum conidial density (11.52x107conidia/ml) and germination (90.06%). Also, in order to increase the virulence and efficacy of the prepared bio-formulation, two stickers- Tween-80 and Triton-X@ 0.01% and two spreader oils-coconut oil and mustard oil@ 0.025% were tested. It was found that the formulation incorporated with Tween-80@ 0.01% and coconut oil @0.025% had maximum conidial load(13.12x107 conidia/ml) and spore germination (95.49%). Three doses viz., 5, 10, 15 gm/L were tested on the adults of Helopeltis theivora. Among these doses, the dose of 15 gm/L showed the highest mortality (88%) at 9th DOT.
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    ThesisItemOpen Access
    Assessment of seed quality and incidence of aflatoxin in maize during storage
    (AAU, Jorhat, 2022) Baruah, Sulakshana; Sarma Barua, Nagendra
    The present investigation was undertaken to assess the seed quality attributes and incidence of aflatoxin in maize seeds in different treatment combinations at two different storage periods. Equal amounts of seeds of maize composite variety Vivek Sankul Makka-35 were stored in nine different bag-seed treatment combinations consisting of three bags namely, 150micron polyethylene bag (PEB), high density polyethylene interwoven bag (HDPE) and polylined jute bag (PLJB) and three levels of seed treatments viz., turmeric powder @ 20g/ kg of seeds (TP), carboxin 75% WP @ 2.5g/ kg of seeds (carboxin) and control. The seeds were stored up to six months. At three months of storage, PEB gave the most favourable mean performance for germination index, shoot length, seedling length, field emergence, and percent seed infection and it was at par with HDPE for these characters. PEB gave the best mean performance for moisture content, shoot length, seedling dry weight and field emergence at six months of storage. Seeds treated with carboxin 75% WP showed the most favourable mean performances for moisture content, germination index, root length, seedling length, seed vigour index-I, seed vigour index-II, field emergence and percent seed infection at both three and six months of storage. The bag-seed treatment combination of 150 micron polyethylene bag-carboxin 75% WP (PEB-carboxin) gave the best performance than other bag-seed treatment combinations in both three and six months of storage in respect of moisture content, shoot length, seedling dry weight and percent seed infection. PEB-carboxin was found to be appreciably economic as compared to other bag-seed treatment combinations. It was observed from correlation of characters that, with increase in seed moisture content, there was decrease in shoot length, seedling length, seed vigour index-I and seed vigour index-II and increase in percent seed infection at six months of storage. Simple correlation coefficient between two periods of storage i.e., three months and six months, for each character was either significant or highly significant indicating consistent result or trend in increase or decrease of mean performance for a character from three months‟ to six months‟ period. Total aflatoxin concentration in maize seeds was observed to be of less than 3 ppb in six bag-seed treatment combinations while the amount was more in the three control bags at six months of storage. Treatments, thus, were found suitable for getting reduced incidence of total aflatoxin at the end of entire storage period.
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    ThesisItemOpen Access
    Approaches for management of Meloidogyne incognita in Pulse crops
    (AAU, Jorhat, 2022) Zonunpuii, Maria; Das, Debanand
    Investigation were carried out under Net House condition to evaluate the reaction of eight chickpea germplasm, ten pea germplasm and forty six lentil germplasm along with their respective susceptible checks for resistance against Meloidogyne incognita. All eight germplasm of chickpea screened were found to be either susceptible or highly susceptible to M. incognita. None of the germplasm were found to be resistant to M. incognita. Among ten germplasm of pea, two germplasm viz., IPFD-99-13 and IPFD-12-2 were found to be resistant, two germplasm were found to be moderately resistant, and the rest six germplasm were found to be either susceptible or highly susceptible. Out of forty six lentil germplasm screened, only one germplasm (IPL 81) was found to be resistant, seven germplasm were found to be moderately resistant, while the rest thirty eight germplasm were found to be either susceptible or highly susceptible to M. incognita. Study on the bio-intensive management of M. incognita on black gram with bio-agents viz., Bacillus marisflavi, Bacillus altitudinis, Bacillus subtilis, Trichoderma viride, Verticillium lecanii and Pseudomonas fluorescens showed significant increase in plant growth parameters including root nodulation with corresponding decrease in number of galls per root system, egg masses per root system, and final nematode population over untreated control. The treatment with soil application of Pseudomonas fluorescens @ 1x108 cfu/ml enriched in vermicompost @ 20 g/m2 was found to be the most effective in enhancing plant growth parameters, number of nodules per root system and reducing number of galls per root system, egg masses per root system and final root-knot nematode population in soil. Nonetheless, all the treatments significantly decreased number of galls, egg masses and final nematode population in soil.