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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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  • ThesisItemOpen Access
    REACTION OF SOME AROMATIC RICE VARIETIES AGAINST MAJOR INSECT PESTS AND THEIR MANAGEMENT
    (AAU, Jorhat, 2017-07) Singh, Hemam Ramananda; Borah, D.K.
    Investigation on reaction of some aromatic rice varieties against major insect pests and relationship between morphological and biochemical properties of the rice varieties with insect pest incidence and evaluation of some promising insecticides and neem based insecticides to major insect pests and their natural enemies were carried out at the Assam Agricultural University, Jorhat, during Kharif, 2013 and 2014. From the present investigation, it was found that among the 13 aromatic rice varieties screened during Kharif 2013 and 2014, none of the varieties showed resistance to stemborer. However three varieties viz. Boga Maniki Joha, Koli Joha and Ronga Joha showed Moderately Resistance during vegetative stage and Moderately Susceptible during reproductive stage. In case of case worm and leaf folder, none of the varieties were found to be resistant during the investigation. The morphological characters of the aromatic rice varieties showed non-significant correlation with the incidence of insect pests studied. In case of biochemical properties, carbohydrate showed significant positive correlation with case worm and leaf folder infestation, while non-significant positive correlation with stem borer. Nitrogen showed significant positive correlation with stem borer infestation but non-significant positive correlation to case worm and leaf folder infestation. Chlorophyll, fat and protein showed non-significant positive correlation with the entire insect pest studied. However, phenol showed significant negative correlation with stem borer and leaf folder and non-significant negative correlation with case worm. Investigation on efficacy of some insecticides revealed that Fipronil 80 WG @ 40 g a.i./ha was superior in reducing the infestation by stemborer in terms of both DH and WEH followed by Flubendiamide @ 24g a.i./ha, Lambda-Cyhalothrin @ 25g a.i./ha and Thiamethoxam @ 25g a.i./ha. In case of case worm, the percent reduction over control was highest in Flubendiamide @ 24g a.i./ha (78.31) followed by Fipronil 80WG @40g a.i./ha (75.00), Thiamethoxam @ 25g a.i./ha (69.01) and Lambda-Cyhalothrin @ 25g a.i./ha (66.12) respectively. Similarly in case of leaf folder, the present finding showed that Flubendiamide @ 24g a.i./ha was most effective and it was equally effective statistically with Thiamethoxam @ 25g a.i./ha and Fipronil 80WG @ 40g a.i./ha followed by Lamda-Cyhalothrin @ 25g a.i./ha. The highest yield was recorded in Fipronil 80WG @ 40g a.i./ha followed by Flubendiamide 39.35 SC @ 24g a.i./ha and Thiamethoxam @ 25g a.i./ha however the highest benefit-cost ratio was observed in Thiamethoxam @ 25g a.i./ha. Data on the effect of treatments on natural enemies revealed that Chlorpyriphos @ 500g a.i./ha recorded the least population of odonates and coccinellids followed by Lambda-Cyhalothrin @ 25g a.i./ha and Thiamethoxam @ 25 g a.i./ha respectively while Lambda-Cyhalothrin @ 25g a.i./ha recorded the least population in case of spider followed by Chlorpyriphos @ 500g a.i./ha and Thiamethoxam @ 25g a.i./ha respectively. Neem insecticide @ 3ml/L showed least effect on spider and coccinellids followed by Flubendiamide @ 24g a.i./ha and Spinosad @ 50g a.i./ha respectively. However Flubendiamide 24g a.i./ha showed the least effect on odonates followed by neem insecticide @ 3ml/L and Spinosad @ 50g a.i./ha respectively.