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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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  • ThesisItemOpen Access
    OPTIMIZATION OF Tamarindus indica L. DYE FOR SURFACE ENRICHMENT OF SILK FABRIC
    (2023) BURAGOHAIN, SHILPI; Boruah, Sunita
    The art of dyeing and printing has played a vital role in adding beauty to textile. Increased awareness regarding environmental issues has vastly encouraged the idea of using eco-dyes and eco-printing for textiles offers numerous benefits, as their preparation and application involved minimal or no harsh chemical reaction that are good for nature and also have positive effects on the wearer’s health. In the field of textiles, the present era can truly be called the era of eco-dyeing and printing. Value addition of the silk fabric through eco-dyeing and printing will lead to more consumer acceptance in the National on International markets thereby, more profitability. Dyeing and printing also add natural value to mulberry silk, making it more attractive and allowing for the creation of diversified products. In light of these benefits, the researcher conducted a study on “Optimization of Tamarindus indica L. Dye for Surface Enrichment of Silk Fabric”, with the following objectives: • Optimization of dyeing condition of Tamarind seed dye on mulberry silk fabric • Surface enrichment of dyed fabric using eco-printing method • Analysis of properties of dyed and printed fabrics To carry out the study, mulberry silk fabric with two different mordants (Alum and Aloe vera) was selected. Seeds of tamarind (Tamarindus indica L.) were selected after pre-testing as a natural dye source. For the study, selected natural dye and mulberry silk fabrics were collected from the local market of Jorhat district, and mordants were collected from the campus of the Assam Agricultural University, Jorhat. Identification of samples was done by assigning names to each a C (Control sample), CT (Without mordanted), CTA1 (Alum mordanted), CTA2 (Aloe vera mordanted), DMEA1 (Dyed fabric with Manjistha Eco-print using Alum as mordant), and DMEA2 (Dyed fabric with Marigold Eco-print using Alum as mordant). Different dyeing conditions such as extraction medium, extraction time, dye material concentration, dyeing time, mordant concentration, mordanting time and mordanting methods such as (pre, simultaneous and post) were optimized. A pre-treatment method such as degumming was carried out for mulberry silk fabric. The optimum dye extracting time was 60 minutes. The extraction was used to dye mulberry silk fabric and the optimum conditions were 1% dye at 60°C for 60 minutes. The surface of the dyed silk fabric was enriched using eco-printing techniques. Pre-testing was done followed by four techniques i.e., Bundle dye technique, Plain background technique, Tannin target iron blanket technique and Plain target dye blanket technique. Among them, the Plain target dye blanket technique was selected for the study as it shows a better printing effect than others. SEM analysis was done to determine the surface morphology of the control and dyed silk fabric and the differences in morphology and elements between them were clearly visible. FTIR analysis was used to identify the functional groups and various bonds that were present in the fabric and visible in different spectra. The crystallinity region of the fabrics was identified using XRD analysis and an alteration in the crystallinity structures of dyed silk fabrics compared to the control was discovered. The Ultraviolet Protection Factor (UPF) of the control, non-mordanted, and different dyed silk fabrics were evaluated and found that the Ultraviolet protection property was increased in dyed silk fabrics. The samples were evaluated visually and with the help of Greyscale for determining the colourfastness properties such as Colourfastness to Sunlight, Colourfastness to Washing, Colourfastness to Crocking or Rubbing (Dry and Wet), Colourfastness to Pressing (Dry and Wet), Colourfastness to Perspiration (Acidic and Alkaline), which exhibited fair to good ratings with noticeable stained to negligible stained. It was clear from the present investigation that colourfastness properties of natural mordanted samples showed good fastness properties to sunlight, washing, crocking, and pressing as compared to metallic mordant samples. The control, dyed and printed silk fabric were undergone for a series of physical experiments. The dyed, mordanted and printed silk fabrics were found to be increased in terms of fabric count (Ne), fabric thickness (mm), weight (GSM), tensile strength (N), moisture regain (%), wicking height (cm) and crease recovery (angle) than control silk fabric. The elongation (%) and stiffness (cm) were found to be decreased in dyed, mordanted and printed silk fabric as compared to the control one. Hence, it could be concluded from the study that natural dye with natural mordant and eco-print obtained an excellent effect on mulberry silk fabric and it can be used for the textile industry and eco-friendly textile manufacturing.
  • ThesisItemOpen Access
    BIOMASS EXTRACTION FROM Cocos nucifera HUSK- AN AGRO-ORGANIC WASTE FOR COLORATION OF SILK FABRIC
    (2023) DAS, PURNIMA; Kalita, Binita Baishya
    In present years, natural dyes have gained popularity as a safer alternative to dangerous synthetic colors. Eco-friendly, environment-safe natural dyeing techniques and products are today’s entail for textiles. Natural coloring substances are now growing trends for their use all over the world because of health hazards and toxicity problems created by synthetic dyes. Considering the growing importance of natural dyes all over the world, the present investigation entitled “Biomass extraction from Cocos nucifera husk- An agro-organic waste for coloration of silk fabric” was undertaken to assess the following objectives: 1. Extraction and optimization of dyeing conditions of coconut husk dye on mulberry silk fabric. 2. Surface enhancement of dyed fabric using eco-printing method. 3. Evaluation of properties of dyed and printed fabrics. To carry out the study, coconut (Cocos nucifera) husks dye was used as a natural dye to develop variety of natural colors on mulberry silk fabric using alum and gallnut as mordants. For extraction of dye, an aqueous medium was employed with an optimum wavelength of 570 nm which showed the highest (1.62%) absorbency value. Pre-treatment method such as degumming was carried out for the mulberry silk fabric to enhance the lustre, color and texture of the dyed silk fabric. Based on the objectives different dyeing parameters were optimized such as extraction medium, extraction time, dye concentration, dyeing time, mordant concentration, mordanting time and mordanting methods. The optimum dye extraction time was 60 min. Dyeing process was carried out keeping the material to liquor ratio 1:30 at a constant temperature of 70ºC for 45 min. The optical density values of the dye solution before and after dyeing were carried out to find out absorption percentage (%). The mordant concentration, mordanting time and mordanting methods were also optimized to get better shades. Brown, light brown and medium to deep brown colors were obtained from dyed, alum mordanted and gallnut mordanted silk fabric, respectively. The physical and colorfastness properties of the fabrics were evaluated. As regards physical properties, the dyed with and without mordant and mordanted eco-printed silk fabrics were found to be increased in terms of fabric count (Ne), thickness (mm), weight (g/m2), crease recovery (angle), stiffness (cm), elongation (%) compared to control fabric. However, the decreased in tensile strength (N), moisture regain (%) and wicking height (cm) were found in dyed with and without mordant as well as mordanted eco-printed silk fabrics. From the test results, it can be concluded that all the samples of silk fabrics showed satisfactory results and wide scope of development of textile materials. The colorfastness to sunlight, washing, crocking, pressing and perspiration were assessed for dyed and eco-printed silk fabrics in terms of color alteration and all the samples found to be good to very good fastness and there was slightly to negligible staining of the color. The morphological and structural characteristics of control and dyed fabrics were assessed using SEM, FTIR and XRD analysis. SEM images of control and dyed silk fabrics revealed that slightly rough surface with irregularities, cylindrical shapes, presence of fibrils, nodes. The control and alum mordanted dyed sample showed smoother and more uniform surface than the without mordanted and gallnut mordanted samples. FTIR spectrum of the control and dyed silk fabric samples showed the presence of various components such as alkenes, aliphatic amines, alcohols, carboxylic acids, esters, ethers, phenol ring, 1º amines, alcohols, phenols. The crystallinity region of the fabrics was identified by XRD analysis and alterations in the crystallinity structures of dyed silk fabrics compared to control were discovered. The Ultraviolet protection properties of control, dyed with and without mordanted silk fabrics were evaluated and found that the Ultraviolet protection properties of dyed fabrics were more as compared to control fabric. Both alum and gallnut mordanted fabrics showed good UV protection. However, control and without mordanted dyed fabric showed very poor UV protection.
  • ThesisItemOpen Access
    Utilization of Agro-Industrial Waste Punica granatum Rind for Dyeing of Cotton Fabric
    (2023) Borah, Priyanka; Boruah, Rickey Rani
    Huge quantities of residues are produced every year by agricultural-based industries.Without a proper disposal procedure; these wastes have the potential to harm the environment, affecting both human and animal life in the ecosystem. The ever-increasing amounts of such industrial wastes are a big threat to the environment. Nature, unlike any other source, has a wonderful visual device for sensing the seven shades of the colour spectrum. Hence, it is considered as the most abundant source of colours. Use of natural dyes has increased several folds in the past few years due to the eco-friendly approach of the people. Natural dyes have been the vital source of colouration by craft dyers and printers since time immemorial. Natural dyes are substantive and require a mordant to fix to the fabric, prevent the colour from either fading with exposure to light or washing out.The present investigation entitled “Utilization of Agro- Industrial Waste Punica granatum Rind for Dyeing of Cotton Fabric” was conducted during the year 2021-23. In this study dyeing of cotton fabric was done using Punica granatum Rind with the following objectives: 1. Optimization of dyeing conditions from Agro- Industrial waste Punica granatum rind dye on cotton fabric. 2. Analysis of properties of dyed fabrics. For the study, Agro- Industrial Waste Punica granatum Rind, mordants such as alum, myrobalan and banana pseudo stem were selected for the study. The cotton fabric was selected to carry out the dyeing. For extraction of Punica granatum Rind dye, 0.6% optimized alkaline medium with highest optical density 1.55 was taken for extraction of dye at 100ºC for 75 minutes. The dyeing of cotton fabric was done using 3% dye at 70ºC for 60 minutes. The different shades of colours like beige and brown colourwere obtained after dyeing of cotton fabric with Punica granatum rind dye using three different mordants such as myrobalan, alum and banana pseudo stem. Colourfastness tests namely, colourfastness to sunlight, colourfastness to washing, colourfastness to crocking and colourfastness to pressing were assessed for dyed cotton fabrics and they demonstrated very fair to good ratings, and there was little to no staining of the colour. FTIR analysis indicated the peaks shows different functional groups like -OH, C=C, N-H and C-H, double bonds or aromatic compounds, saturated aliphatic compound, aromatic ring, phenol, alcohol, ether, amine and carbonyl compounds in all the mordanted, non mordanted and control cotton fabric. The morphological, structural characteristics of control and dyed cotton fabrics were assessed using SEM and the differences in morphology were clearly visible. The colour strength (K/S) value of dyed cotton fabric was calculated and found that alum mordanted dyed fabric had the greatest K/S value (3.06). Hence alum mordanted fabric showed darker colour. The non mordanted and different mordanted cotton fabrics were found to be increased in terms of fabric count (nos.), fabric thickness (mm), fabric stiffness (cm), fabric wicking height (cm) and moisture regain (%) than control cotton fabric. The tenacity and elongation, crease recovery (angle) of dyed fabrics were decreased due to breakdown of intermolecular forces during dyeing and other processes. Ultra-violet protection properties were increases in dyed cotton fabric. The highest Ultra-violet protection property was observed by alum mordanted cotton fabric followed by myrobalan, banana pseudo stem, non mordanted and control cotton fabric. After 5th and 10th wash, the ultra violet protection properties was found to be decreased in dyed fabric.The investigator developed three different products from the dyed cotton fabric namely, Kaftan top, Parallel pant and shirt andthe assessing of the prepared products were done by using research schedule.
  • ThesisItemOpen Access
    DEVELOPMENT OF SUSTAINABLE TEXTILE USING ECO-FRIENDLY NATURAL DYE EXTRACTED FROM MANGO (Mangifera indica) LEAVES
    (2023) Devi, Moirangthem Jeena; Boruah, Sunita
    Sustainable textiles are materials that are derived from eco-friendly resources such as natural fibers, recycled materials, non-toxic dyes, printing materials and environmentally friendly manufacturing processes which make economically fair products for society. Since synthetic dyes are harmful, people are now shifting towards natural dyes instead which can create unique aesthetic qualities. Natural mordants contain tannin, catechin and other compounds which can be used in the colouration of textile materials. Today’s emphasis on natural dyes and eco-printings is a result of the growing concern for ecological sustainability and pollution-related issues that synthetic equivalents have caused around the world. Given the significance of utilizing natural dyes and surface enrichment on the coloured fabric, the targeted study was conducted on the “Development of sustainable textile using eco-friendly natural dye extracted from Mango (Mangifera indica) leaves” with the following objectives:  Optimization of dyeing condition of mango leaf dye on eri silk fabric.  Surface ornamentation of dyed fabric using eco-printing method.  Assessment of properties of dyed and printed fabric. In the present study, mango (Mangifera indica) leaves were selected as a natural dye and myrobalan was selected as a natural mordant and alum as a metallic mordant to use in dyeing eri silk fabric. The effect of mordant on dyeing was compared with the metallic mordanted and non-mordanted dyed fabric. Selected dye and mordant were collected from the Assam Agricultural University campus and eri silk was collected from the market of Guwahati, Assam for the study. Dyeing conditions, such as medium of extraction, extraction time, dyeing concentration, mordant concentrations, mordanting time and mordanting methods were optimized based on the objectives. Before dyeing, pre-treatment process such as degumming was carried out for the eri silk fabric. During the experimental processes, some dyeing conditions were kept constant such as material ratio (1:50) for extraction at 100°C. The dye absorption (%) was determined from the optical density value of the dye solution recorded before and after dyeing. Eco-printing of the dyed fabric was done after the dyeing process. The colour of mango (Mangifera indica) leaves dye obtained was deep yellow colour but turned yellowish green and buff yellow when two different mordants namely, alum and myrobalan were added to it. Evaluation of colourfastness properties namely colourfastness to washing, colourfastness to sunlight, colourfastness to crocking (wet and dry), colourfastness to perspiration (acidic and alkaline) and colourfastness to pressing (wet and dry) was carried out on the dyed and eco-printed samples, exhibited fair to good ratings with slightly to negligible stained. Characterization of control and dyed fabric samples were analyzed through FTIR, SEM, XRD and UPF. FTIR was evaluated to determine the presence of different functional groups before and after dyeing and observed the different spectrums in the control and dyed fabric. SEM analysis was done to determine the structure of the fiber before and after the dyeing of the eri silk fabric. X-ray diffraction of control, dyed and mordanted fabrics showed different peaks of crystallinity at different levels of 2Ө and there were changes in fabrics with different mordants. The ultraviolet protection factor was increased in dyed (non-mordanted) eri silk fabric as compared to control fabric. Some physical properties of dyed and eco-printed fabrics like fabric count (Ne), thickness (mm), fabric weight (GSM), elongation (%), moisture regain (%), stiffness (cm) and creased recovery angles were increased after dyeing and eco-printing of silk fabric. And the mordant has a significant effect on the colour of fabric and colourfastness properties were also influenced by the type of mordant used for dyeing and eco-printing. Hence it can be concluded from the study that natural mordant and natural dye obtained excellent effects on eri silk fabric.