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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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20181
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Subject: Agronomy × Author: BHATTACHARJYA, DIBYARISHI × End date: 2019 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    COPING UP WITH CLIMATE CHANGE VARIABILITY THROUGH THE PRACTICE OF DIRECT SEEDING OF EARLY AHU RICE UNDER MEDIUM LAND SITUATION
    (AAU, Jorhat, 2018-07) BHATTACHARJYA, DIBYARISHI; Sarma, A.
    A field experiment entitled “Coping up with climate change variability through the practice of direct seeding of early ahu rice under medium land situation” was carried out at the Instructional-cum-Research (ICR) Farm, Assam Agricultural University, Jorhat during 2017 to developthe irrigation schedule of direct seeded early ahu rice under medium land situation and to develop package of practices for direct seeded early ahu rice to suit the variability in rainfall pattern covering the angle of nutrient management practices. The experiment was laid out in a split plot design with 3 replications. The treatments consisted of four irrigation regimes viz. irrigation at 80% available water till onset of pre-monsoon rain (I1), irrigation at 70% available water till onset of pre-monsoon rain (I2), irrigation at 60% available water till onset of pre-monsoon rain (I3) and rainfed (I4) as main plot and three nutrient management treatmentsviz. full P as basal + ½ N and ½ K at 20 DAS + ½ N and ½ K at 40 DAS (N1), full P as basal, 1/3 N and 1/3 K as basal + 1/3 N and 1/3 K at 20 DAS + 1/3 N and 1/3 K at 40 DAS (N2) and full P as basal, ½ N and ½ K as basal + ¼ N and ¼ K at 20 DAS + ¼ N and ¼ K at 40 DAS (N3) as sub plotand control (transplanted early ahu rice with recommended water and fertilizer management practices). The soil of the experimental plot was silt loam in texture having pH 5.2, organic carbon 7.2 g/kg, alkaline KMnO4 extractable N 181.0 kg/ha, Brays-I P 10.7 kg/ha and 1 N ammonium acetate extractable K 227.9 kg/ha. It contained soil moisture 27.6% at -0.03 MPa and 9.6 % at -1.5 MPa with bulk density of 1.34 g/cc. The rice variety “Inglongkiri” was sown on 18th February, 2017. The control treatment with recommended water and nutrient management practice was transplanted on 17th March, 2017. The direct seeded crop was harvested on 15thJune, 2017 and the transplanted crop (control) was harvested on 22nd June, 2017. Experimental findings revealed thatirrigation at 80% available water till onset of pre monsoon rain (I1) recorded the highest values for all the morphological and physiological parameters along with the yield, yield attributing characters, nutrient (N,P and K) uptake and water use efficiency (WUE) of the crop. The highest grain yield (39.83 q/ha) and straw yield (90.96 q/ha) wererecorded atirrigation at 80% available water (I1). However, nutrient content in soil after harvest of the crop was found to be non-significant. The highest uptake of nitrogen (105.5 kg/ha), phosphorus (24.3 kg/ha) and potassium (124.2 kg/ha) were obtained from irrigation at 80% available water (I1). However, nutrient content in soil after harvest of the crop was found to be non-significant. The highest values of all the morphological and physiological parameters along with the yield, yield attributing characters, nutrient (N, P and K) uptake and water use efficiency (WUE) of the crop were recorded under the nutrient management practice of full P as basal + ½ N and ½ K at 20 DAS + ½ N and ½ K at 40 DAS (N1). This treatment also recorded the highest grain yield (34.16 q/ha) and straw yield (83.45 q/ha) and uptake of nitrogen (98.2 kg/ha), phosphorus (22.3 kg/ha) and potassium (115.6 kg/ha). However, nutrient content in soil after harvest of the crop was found to be non-significant. The experiment did not show any significant difference between direct seeded crop and transplanted crop with respect to growth parameters, yield attributes and yield. However, direct seeded rice recorded lower water use and higher WUE than transplanted crop. Direct seeded crop also recorded the higher net return and benefit-cost ratio.