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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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20191
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Subject: Sericulture × Author: Das, Sudipta Kumar × End date: 2019 × Start date: 2018 ×
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    ThesisItemOpen Access
    PHENOLOGY AND COCOON CHARACTERS OF ERI SILKWORM (Samia ricini) AS AFFECTED BY TEMPERATURE AND HUMIDITY UNDER JORHAT CONDITIONS
    (AAU, Jorhat, 2019-07) Das, Sudipta Kumar; Dutta, L.C.
    An investigation on “Phenology and cocoon characters of Eri silkworm (Samia ricini) as affected by temperature and humidity under Jorhat conditions” was carried out in the Department of Sericulture, Assam Agricultural University, Jorhat during summer, autumn, early spring and late spring seasons in the year 2018-19. The results revealed that the occurrence of the phenophases and cocoon characters varied significantly in different rearing seasons. The phenophases viz. egg laying period, incubation period, egg hatching duration, larval duration (instar-wise and total), instar-wise moulting duration and cocoon spinning period were found to be longest during early spring season followed by late spring and autumn season. The shortest duration of the phenophases was observed during summer season. Cocoon characters viz. cocoon weight and cocoon shell weight were highest in early spring season followed by late spring and autumn season while lowest values were observed during the summer season. The egg hatching percentage and instar-wise larval weights were found to be highest during early spring season followed by late spring and autumn season while the summer season registered for the lowest values. Larval accumulated growing degree days were observed to be highest during early spring followed by summer, autumn and late spring. Most of the phenophases and cocoon characters were negatively correlated with temperature and relative humidity. The accumulated growing degree days during larval period had a positive effect on the cocoon yield parameters. Predictive models for growth and cocoon yield of eri silkworm developed which indicated the most significant weather factor (temperature and relative humidity) responsible for growth and cocoon yield. Thus, from the present investigation, it can be inferred that the occurrence of different phenophases and cocoon characters of eri silkworm were largely regulated by the environmental temperature and relative humidity during the seasons. The best season for rearing was found to be early spring (March-April) considering the larval growth parameters and cocoon yield of eri silkworm. Predictive models developed on the basis of temperature, relative humidity and accumulated growing degree days can be used to estimate the growth and cocoon yield of eri silkworm in different rearing seasons. The findings of the study will help to develop agro-advisory bulletin for various seasons which will help the farmers to adapt eri culture in a proper and efficient way for quantitative and qualitative production of eri cocoon and silk.