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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: Plant Breeding × Author: Pathak, Dalibha × End date: 2019 × Start date: 2019 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    EVALUATION OF SOME RICE GENOTYPES UNDER DELAYED SOWN CONDITION IN SALI WITH LOW LEVEL OF FERTILIZER INPUT
    (AAU, Jorhat, 2019-07) Pathak, Dalibha; Kalita, U.C.
    An experiment was conducted during the late sali season (August) of 2018 at Instruction cum Research Farm, Assam Agricultural University, Jorhat following 3 replicated RBD. The objective of the trail was to evaluate the performance of the genotypes under late sowing situation. Significant variation was observed for grain yield and its component characters. The mean sum of squares due to various sources of variation for 18 quantitative characters revealed the presence of significant differences for grain yield and its component characters. The estimates of phenotypic coefficient of variation (PCV) was found high for chaffs per panicle, grains per panicle, spikelet sterility %, spikelets per panicle, grain yield (kg/ha), tillers per hill, biological yield (kg/ha). The estimates of genotypic coefficient of variation (GCV) was found high for chaffs per panicle, grains per panicle, spikelet sterility %, spikelets per panicle, grain yield (kg/ha). Low estimates of GCV and PCV were recorded for the character viz., days to 50% flowering and days to maturity. In this study, a high heritability coupled with high genetic advance were observed for chaffs per panicle and grains per panicle indicating that the selection might be effective for bringing about improvement for these characters under delayed sown situation. Among the genotypes only one genotype viz., Gandhari was the top yielder (4170 kg/ha)because of its significantly lower number of days to both 50% flowering (101days) and days to maturing (131 ), spikelet sterility (23.13 %) than their corresponding values of the check Manoharsali; significantly higher spikelets per panicle (238.19), grains per panicle (183.07) grain yield (17.18 g/hill), straw weight (6575.16 kg/ha), biological yield (10745.10 kg/ha) and harvest index (38.86 %) than their corresponding values of the check Manoharsali and moderate performance for the remaining characters. The high GCV was observed for chaffs per panicle, grains per panicle, spikelets per panicle, spikelet sterility (%) and grain yield (kg/ha) and high PCV was observed for chaffs per panicle followed by grains per panicle, spikelet sterility (%), grain yield (kg/ha), tillers per hill, spikelets per panicle and biological yield (kg/ha).Grains per panicle, days to 50 per cent flowering, plant height (cm) , panicle length (cm), spikelets per panicle, chaffs per panicle, grain yield (kg/ha), grain yield (g/hill), spikelet sterility (%), 100-grain weight, days to maturity, biological yield (kg/ha), straw weight (kg/ha) and harvest index (%) had registered high heritability. A high heritability coupled with high genetic advance was observed for plant height (cm), spikelets per panicle, spikelet sterility (%), chaffs per panicle, grains per panicle, grain yield (kg/ha), grain yield (g/hill), biological yield (kg/ha), straw weight (kg/ha) and harvest index (%). Grain yield (kg/ha) exhibited significant positive correlation with plant height(cm), panicle length(cm), grains per panicle, spikelets per panicle, grain yield (g/hill) and straw weight (kg/ha). The significant negative correlation of grain yield (kg/ha) had observed with days to 50% flowering, spikelet sterility (%) and days to maturity. From the findings of this investigation, one genotype viz., Gandhari emerged as the outstanding genotype which could be directly used for cultivation in delayed sown situation. Some other promising genotypes that had average productivity more than 3500 kg/ha and yet significantly high yielder than the check Manoharsali under delayed sown condition were JR 29 , JR 16 , Basundhara and JR 60. These genotypes had shown their promise for recommendation under delayed sown condition provided the investigation is continued for another 2-3 years under the same conditionandcould be utilized as potential parental material in the hybridization programmes designed to develop suitable rice varieties for delayed sown situation.