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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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Subject: Agricultural Meteorology × Author: Das, Parishmita × End date: 2019 × Start date: 2015 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    EFFECT OF ELEVATED CO2 AND TEMPERATURE ON GROWTH AND YIELD OF WINTER RICE UNDER JORHAT CONDITION
    (AAU, Jorhat, 2019-07) Das, Parishmita; Deka, R. L.
    A pot experiment was conducted during kharif, 2018 to assess the effect of elevated CO2 and temperature under different transplanting dates on growth and yield of rice variety Ranjit. The treatment composed of three CO2-temperature levels [T0: ambient temperature & ambient CO2, T1: elevated temperature (ambient +1°C) & elevated CO2 (ambient+25% of ambient) and T2: elevated temperature (ambient +2°C) & elevated CO2 (ambient + 50% of ambient)] and three dates of transplanting (D1: 25th June, D2: 10th July and D3: 25th July). The experiment was conducted in three CO2 Temperature Gradient Tunnels (CTGTs) following factorial CRD with 4 replications. Occurrence of different phenological stages like tiller initiation, panicle initiation and flowering was earlier under elevated CO2-Temperature condition which significantly differed with the ambient condition. On the other hand, days to tillering increased whereas days to panicle initiation, flowering and physiological maturity reduced with delay in transplanting. The crop duration was reduced by about 15 days and 8 days under T2 and T1 respectively compared to T0 and by about 10 days and 5 days in D3 and D2 respectively compared to D1. Reduction in the duration of vegetative phase was found to be more distinct than the reproductive and ripening phases. Accumulated agro-climatic indices viz., AMaxT, AMinT, AMeanT and AGDD showed a gradual decline with delay in date of transplanting from 25th June onwards during vegetative, reproductive and maturity stages irrespective of CO2-Temperature treatments. Similarly, accumulated agro-climatic indices decreased under elevated CO2-Temperature during vegetative stage but increased during reproductive and ripening phases of the crop. Plant height and tiller number was recorded highest under T2 followed by T1 compared to T0, which decreased with delay in transplanting. Both plant height and number of tillers differed significantly in CO2-temperature treatment as well as dates of transplanting. Number of panicles hill-1, panicle length, number of filled grains panicle-1 and 1000-grain weight were significantly influenced by elevated CO2-temperature levels and date of transplanting. Number of panicles was greater but filled grains panicle-1 slightly reduced under T2. With respect to dates of transplanting, D2 recorded higher number of panicles hill-1 (17.9) and higher filled grains panicle-1 (156.6). Higher grain yield (55.9g hill-1) attributed to higher number of panicles hill-1 and filled grains panicle-1 was observed under T2 which was at par with T1 and it was statistically significant over ambient. Grain yield significantly reduced (40.6g hill-1) when transplanting was delayed after 10th July. Similarly, straw yield and above ground biomass at harvest were significantly increased with CO2-temperature elevation but reduced with delay in transplanting. Though the interaction effect of CO2-temperature and dates of transplanting on rice yield was not statistically significant, the results revealed that the growth and yield of rice variety Ranjit was found to be better under elevated CO2-temperature levels when transplanted on 10th July.