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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: Crop Physiology × Author: Doulboruah, Pronamee × End date: 2021 × Start date: 2021 × Type: Thesis ×
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    ThesisItemOpen Access
    Nitrogen acquisition under elevated CO2 and temperature in rice (Oryza sativa L.)
    (AAU, Jorhat, 2021) Doulboruah, Pronamee; Das, Ranjan
    A field experiment was conducted at stress physiology laboratory, AAU, Jorhat during kharif season of 2020-2021 to study the “Nitrogen acquisition under elevated CO2 and temperature in rice (Oryza sativa L.). The experiment was carried out in controlled environment under CO2 temperature gradient tunnel (CTGT), to understand the differential response of rice to higher level of CO2 i.e. CTGT-I at ambient CO2 395 ppm & temperature, CTGT-II at elevated CO2 (550±20ppm) + temp. of 4 0 C > ambient and CTGT-III at elevated CO2 (750±20ppm) + temp. of 6 0 C > ambient with four different level of N treatment viz. N0 (zero N), N1 (75% recommended dose), N2 (100% of recommended dose), N3 (125%of recommended dose). The experiment was laid out in two factorial completely randomized block design (FCRD) with 10 replications. The popular rice cultivar of Assam, Luit, was collected from research station of Agricultural University. This experiment was conducted on pot which was sown on 8th Aug 2020 and harvested between 28th Nov to 2nd Dec 2020. In the experiment under elevated CO2 and temperature there was a significance difference of crop growth parameters where highest value were recorded at CTGT-II with N3. In phenological data highest value was recorded at CTGT-III with N3. All biochemical and anatomical parameters also exhibit better result in CTGT-II with N3 as compared to CTGT-I. Membrane related phenomenon i.e. MSI was recorded as high at CTGT-II with N3. But there was a negative trend in H2O2 and lipid peroxidation where highest value was recorded at CTGT-III with N0. Similar result also found in water relation parameters and all physiological parameters. Chlorophyll florescence related phenomenon shows highest result in CTGT-II at N3. Likewise, yield attributing parameters gave highest value in CTGT-II with N3. Results shows that application of N significantly increased various morphological growth parameters as well as yield parameters in rice under elevated CO2 condition (at 550±20 ppm with 40 c temperature) under CTGT-II as compared to CTGT-I and CTGT-III. High temperature has a deleterious effect on plant growth and some related processes viz. physiological and biochemical activities because an effect on C: N ratio. Therefore, supplementation of N may play a pivotal role in amelioration of some deteriorative process like lipid peroxidation content and MDA content of leaves thereby reduced yield by affecting yield attributing parameters. Results indicated that higher doses of N under elevated CO2 and temperature invariably maintained not only the C:N ratio but also improved the physiological response positively. But at lower level of N in plant showed poor plant growth as well as metabolic de-arrangement because of low photo synthetic rate, nitrate reductase activity, chlorophyll loss and depression membrane stability index. Therefore, modification of agriculture and nutrient management technologies for future environments is important criteria for sustainable management of rice ecosystem.