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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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20211
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Subject: Textile and Apparel Designing × Author: Baruah, Sourav × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Optimization of extraction and dyeing parameters of Lac dye from Kerria chinensis (Mahd.) on cotton
    (2021) Baruah, Sourav; Boruah, Rickey Rani
    The present investigation entitled "Optimization of extraction and dyeing parameters of Lac dye from Kerria chinensis(Mahd.) on cotton”was conducted during the year 2019-21.In this study dyeing of cotton was done using Lac dye from species K. Chinensiswith the following objectives. 1. Standardization (optimization) of extraction and dyeing parameters of Lac dye. 2. Evaluation of the colour fastness properties of dyed cotton yarn. Natural dyes are emerging globally as eco-friendly colourant. The greater part of natural dye is vegetable dye obtained from plant source but there are dyes also obtained from insects e.g., Lac Dye. Lac is an animal originated insect dye which is found in India. They can also produce variety shades of colour. During the investigation,HCI, water and Na2CO3were used for acidic, aqueous and alkaline extraction method respectively. Result showed that the optimum extraction was 10% for each medium at 60°C for 60 minutes, 90°C for 100 minutes and 40°C for 75 minutes in acidic, aqueous and alkaline medium respectively. The natural colourant extracted from Lac insect (Kerria chinensis), was utilized for colouration of cotton yarn and their dyeing properties were investigated. Four different mordants such as alum, myrobalan, aluminium sulphate and ferrous sulphate were used on cotton yarns at different concentrations with pre, simultaneous and post-mordanting method to assess the colour fastness properties of the dyed samples. Results showed that, mordant has a significant effect on the colour of yarns and fastness properties were influenced by the type of mordants used. Lac dye showed burgundy to purple colour with mordant alum and orange to red orange colour with mordant aluminium sulphate, faded red in mordant myrobalan and ferrous sulphate shows dark grey colour on cotton yarn in different medium. Alum mordant showed more excellence in physical properties of dyed yarn while aluminium sulphate shows more excellence in colour fastness. Dyed cotton yarn exhibited the best colour fastness range from very fair to good with aluminium sulphate mordant. The cotton yarn samples dyed with alum was found to be better than myrobalan, aluminium sulphate, and ferrous sulphate in respect of tenacity (g/tex), wicking height (cm) and moisture regain (%). Cotton yarn samples mordanted with myrobalan showed highest density, wicking height and moisture regain. The myrobalan mordanted dyed cotton yarn showed highest tenacity and elongation.