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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: Plant Breeding × Author: Brahma, Thirangtha × End date: 2021 × Start date: 2021 × Type: Thesis ×
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    ThesisItemOpen Access
    Variation of Weed Suppressing Ability (WSA) of popular Ahu rice varieties
    (2021) Brahma, Thirangtha; Sharma, Kishore K.
    The research was carried out with ten Ahu genotypes (including two joha mutants). The objective of the study was to identify Ahu rice varieties with weed suppressing ability (WSA), determine genetic variability and determination of the component traits for weed suppressing ability. High PCV was observed for all the characters except field emergence, plant biomass at maturity, plant height at 20 DAS and 40 DAS, grains per panicle and 1000 grain weight. High GCV were observed for number of leaves at 60 DAS and maturity, leaf area, leaf angle, plant height at 60 DAS and maturity, plant biomass at 60 DAS, total plants/m2, total tillers/m2, ear bearing tillers and grain yield /m2. High heritability was observed for all the characters except number of leaves at 20 DAS. High genetic advance was observed for all the traits except panicle length and 1000 grain weight. Estimation of correlation coefficient revealed very strong positive association of grain yield with plant biomass at maturity, plant height at maturity, total plants/m2, total tillers/m2, ear bearing tillers, grains per panicle, 1000 gr. Wt. and weed suppressing ability. Moderately strong association was found with number of leaf at maturity. Negative association was observed with weed biomass at maturity, number of weeds, leaf angle and days to flowering. Strong positive association of weed suppressing ability was found with number of leaves at maturity, plant biomass at maturity, plant height at maturity, total plants/m2, ear bearing tillers and grains per panicle. Moderately strong association was found with leaf area and 1000- grain weight. Negative association was found with weed biomass, number of weeds, days to flowering and panicle length. Characters positively associated with weed suppressing ability: number of leaves at maturity, plant biomass at maturity, plant height at maturity, total plants/m2, ear bearing tillers/m2, grains per panicle, leaf area and 1000 grain weight. Characters with high heritability having positive correlation with weed suppressing ability are number of leaves, leaf area, plant biomass, plant height and total plants/ m2. From the research, it was concluded that the variety Inglongkiri exhibited the highest weed suppressing ability followed by Banglami, Meghi and Puthia.