Thumbnail Image

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.

Browse

20175
Reset filters
Subject: Plant Breeding × End date: 2017 × Start date: 2017 × Type: Thesis ×
Reset filters

Search Results

Now showing 1 - 5 of 5
  • Thumbnail Image
    ThesisItemOpen Access
    PERFORMANCE EVALUATION OF BIO PRIMING FOR UPLAND DIRECT SEEDED RICE IN ORGANIC CONDITION
    (AAU, Jorhat, 2017-07) Koch, Bijit; Deka, Sharmila Dutta
    Rice is the world’s most important crop and is a staple food for more than half of the world’s population. Worldwide, rice is grown on 161 million hectares, with an annual production of about 744.4 million tons of paddy (FAO, 2014). Rice production and consumption in India have increased during the last quarter of century. In the last two decades, seed priming an effective seed invigoration method has become a common seed treatment to increase the rate and uniformity of emergence and crop establishment in most crops. Bio-priming is a process of biological seed treatment that refers to the combination of seed priming and inoculation of seed with beneficial organism to protect seed and improve the quality. Experimental findings revealed that field emergence percentage significantly varied in response to seed treatment with different bio agents and highest field emergence was observed in T7 (hydration) and least was observed in (T8) control. Effect of seed treatment was non-significant for seedling/m2, but it shows significant variation in growth parameters like seedling height and seedling biomass. Among the vigour indicators root length and shoot length varied significantly in response to different treatments. Plant growth response was found to be non-significant for different seed treatment except total biomass production which varied significantly among the treatments. The total biomass production was found to be higher in treatment with consortium (T6) and Bacillus cereus (T4) .Total biomass production was found to be significantly higher in treatments with 10% reduced seed rate. All the recorded yield and yield attributes were found to be non-responsive to seed priming with bio agents except harvest index. Highest harvest index was observed in treatment (T2) T. harzianum followed by (T8) control and (T7) hydration. The treatment effects of reduced seed rate (10 %) were found to be at par with normal seed rate, it may be because of less competition for inputs in the early vegetative stage. Weed density is found to be affected by the treatment variation at early stage. The highest weed density was observed in treatment T8 (control) and least was observed in treatment T4 (Bacillus cereus) .The laboratory test indicates high positive correlation between field emergence and few vigour indicators viz seed vigour index I, seed vigour index II and seedling dry weight. The present study of seed treatment has significant positive effect on field emergence, hence can be successfully employed for better field emergence in organic condition.
  • Thumbnail Image
    ThesisItemOpen Access
    EFFICACY OF SOME PLANT PRODUCTS AGAINST PULSE BEETLE, Callosobruchus chinensis (COLEOPTERA; BRUCHIDAE) ON STORED GREEN GRAM SEED
    (AAU, Jorhat, 2017-07) HANSEPI, JIRKA; Goswami, M. M.
    An experiment was conducted during 2016-17 in the laboratory of National Seed Project (crops), Assam Agricultural University, Jorhat to evaluate the efficacy of some plant products against pulsebeetle, Callosobruchuschinensisand their effects on seed viability and seedling vigour in green gram seed under laboratory storage conditions. Greengram seeds are infested by various storage pest among which Callosobruchuschinensis is the most important and common of all bruchid pest in India. Although, synthetic pesticides are effective in controlling the pest, environment and health hazards of these chemicals are of increasing concern. The study assessed efficacy ofnine botanical products namely Neem seed kernel powder, Basil leaf powder, Black pepper powder, Sweet flag rhizome powder, Turmeric powder, Ginger powder, Sesamum oil, Groundnut oil, Mustard oil were used in the experiment with malathion 5% dustas check. The different observations viz., per cent germination, seedling vigour index, per cent moisture content, per cent insect infestationwere evaluated at 0, 15, 30, 60, 120 and 180 days after treatment of the seeds stored in porous HDPE bags. The results revealed that most of the treatments were significantly superior to untreated check. The treated check i.e.malathion 5% dust(per cent germination; 93.33, seedling vigour index; 1404.60, per cent infestation; nil, per cent moisture content; 11.94) @ 2.5g per kgwas found to be the best treatment followed by sweet flag rhizome powder (per cent germination; 91.33, seedling vigour index; 1355.06, per cent infestation; 0.75, per cent moisture content; 11.99), vegetable oils such as mustard oil, groundnut oil, sesamum oiland black pepper powder after six months of storage. For evaluation of insecticidal activity of different plant products against pulse beetle,Callosobruchuschinensis in green gram seeds stored in glass jars, the different observations viz., per cent infestation, per cent weight loss, per cent germination, seedling vigour index were evaluated at 15, 30, 60 and 120 days after the release of insects. Here, also malathion 5% dust (per cent germination, 93.66), (seedling vigour index, 1528.96), (per cent infestation, nil), (per cent weight loss, 0.09)@ 2.5g per kg was found to be the best treatment as no infestation was recorded upto 120 days. The results were in conformity with the seeds stored in HDPE bag in case of other plant products. The present findings revealed that sweet flag rhizome powder, vegetable oils and black pepper powder can be used as an alternative to chemical insecticides against pulse beetle, Callosobruchuschinensis in stored green gram seed.
  • Thumbnail Image
    ThesisItemOpen Access
    EFFECT OF PRE-SOWING SEED TREATMENTS AND SOWING DATES ON YIELD AND QUALITY OF GREENGRAM SEEDS IN SUMMER AND KHARIF SEASON
    (AAU, Jorhat, 2017-07) Devi, Krishna; Barua, Purna K.
    Greengram (Vigna radiata (L.) Wilczek) is an important pulse crop of India. A study was conducted in 2016 in the laboratory and experimental farm of the Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat to evaluate the effect of pre-sowing seed treatments and sowing dates on yield and quality of greengram seeds in summer and kharif season. Ten different seed treatments namely water soaking for overnight, MnSO4 100 ppm, neem extract 1%, GA3 @ 5 ppm, KCl 1%, linseed oil @ 10 ml per kg of seed, rhizobium, neem+rhizobium, linseed oil+ rhizobium, trichoderma, were used along with a control. In laboratory experiment before sowing highest germination percent, lowest hard seed, highest seedling length, highest vigour index and highest seedling dry weight were observed in gibberellic acid treated seed, while neem treated seed showed lowest dead seed and KCl treated seed showed lowest fresh ungerminated seed. In laboratory experiment summer season was better than kharif for all the seed traits except for fresh ungerminated seed which was not affected by season. In field experiment gibberellic acid treated seed outperformed then other treatments showing highest seedling emergence and highest shoot and root length at 20 DAS, lowest days to 50% flowering and maturity, highest raw and graded seed yield, highest pure live seed, highest hundred seed weight. Untreated control performed very poorly followed by linseed oil coated seed. Most of the characters studied were found to be unaffected by season except for raw and graded seed yield as well as hundred seed weight for which summer crop performed better than kharif. In laboratory experiment after harvest highest germination percentage, seedling length, seed vigour index, seedling dry weight and lowest hard seed and fresh ungerminated seed was found in gibberellic acid treated seed. Summer season was better than kharif for seed yield and quality. Pre-sowing seed treatment considerably enhanced seed yield and quality where priming with 5 ppm gibberellic acid outperformed all other treatments.
  • Thumbnail Image
    ThesisItemOpen Access
    GENETIC VARIABILITY, CHARACTER ASSOCIATION AND PATH ANALYSIS IN WHITE JUTE (Corchorus capsularis L.)
    (AAU, Jorhat, 2017-07) GAYARY, KHWMDWN; Das, P. K.
    Jute Corchorus species is a natural fiber cash crop and is second in the world after cotton in terms of global production, consumption and availability. Jute plays a vital role in Indian economy in general, and the eastern region in particular. In India jute is cultivated mainly in the eastern states like West Bengal, Assam, Tripura, Bihar, Orissa and to some extent in Uttar Pradesh. The present investigation was conducted for estimation of genetic variability, character association and path analysis of fibre yield and its attributes were studied on 50 genotypes of white jute including two check varieties JRC-517 and Apeswaree. The study was conducted in randomized block design experiment with 2 replications. The seeds were sown in kharif season (April, 2016) with plot size 2 m x 0.75 m and spacing 25 cm row to row and 6 cm plant to plant spacing. Analysis of variance revealed presence of significant amount of variation among all the genotypes for all the characters. Estimates of GCV and PCV were found to be high and had close agreements in plant height, reed length, effective reed length, basal diameter and fibre yield per plant, indicating less influence of environmental effects. High heritability coupled with high genetic advance was recorded for quantitative traits. Correlation studies revealed highly significant genotypic and phenotypic association between fibre yield per plant and its components, like reed length, stick weight per plant and plant height. Therefore, it is concluded that these traits can be used as primary selection criteria for improving jute fibre yield stability. Variability among the genotypes may be utilized by the breeders in future for breeding programme. Also, the results of this study suggest that plant height, reed length, effective reed length, green weight and stick weight per plant should be used as selection parameters.
  • Thumbnail Image
    ThesisItemOpen Access
    EFFECTS OF BOTANICALS AND BIOAGENTS ON STORAGE BEHAVIOUR OF BLACK GRAM (Vigna mungo) SEEDS
    (AAU, Jorhat, 2017-07) DATTA, SURABHI; Medhi, T.
    Black gram (Vigna mungo) is the fourth important pulse crop in India, covering an area of about 3.1 million hectares and contributing to 10-12 per cent of national share among the total pulse production. Due to the tropical and humid climate of India, storage of black gram seeds till next sowing season is the most severe problem, with an average damage percentage of nearly 14.97 under storage conditions. Since, pre-storage seed treatment is very important to keep the seed quality good up to next season, in the present investigation, the effect of a few botanicals and bioagents was observed on the storage behaviour of black gram seeds. The seeds were treated with three botanicals viz., Turmeric powder, Neem leaf powder and Black pepper powder and with two bioagent formulations viz., Biogreen and Biotime. Different seed quality parameters like moisture content, germination percentage, seedling vigour index, field emergence and mycoflora association were observed initially and at an interval of two months up to nine months (270 days) of storage. At the end of nine months of storage, lowest moisture content was observed in Turmeric powder treated seeds (8.90 per cent), followed by the untreated control (9.00 per cent), Black pepper treated seeds (9.16 per cent) and Neem leaf treated seeds (9.30 per cent). However, all these treatments were statistically at par. Highest germination (78.67 per cent) and seed vigour index (1517.63) were observed in the seeds treated with Black pepper powder which were at par with those of Neem leaf powder treated seeds and Turmeric powder treated seeds. Highest field emergence after nine months of storage, was observed in seeds treated with Neem leaf powder (75.33 per cent) followed by seeds treated with Turmeric powder (73.51per cent) and Black pepper power (72.41per cent). The seeds treated with bioagents showed low germination as well as low vigour throughout the storage period. Five organisms viz., Aspergillus flavus, A. niger, Rhizopus spp., Fusarium spp. and Penicillium spp. were found to be associated with the seeds under storage. However, in the seeds treated with bioagents Fusarium and Penicillium were absent. The present findings revealed that the seeds treated with botanicals had good effect on seed quality and can be used as an alternative of chemicals in seed treatment.