Thumbnail Image

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.

Browse

20181
Reset filters
Subject: Soil Sciences × Author: Bharali, Happy × Start date: 2010 × Type: Thesis × Thesis Type: M.Sc ×
Reset filters

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    ThesisItemOpen Access
    FORMULATION OF LIQUID RHIZOBIAL BIOFERTILIZER AND ITS VALIDATION
    (AAU, Jorhat, 2018) Bharali, Happy; Baruah, Rajen
    The present study on “Formulation of liquid rhizobial biofertilizer and its validation” was carried out in the laboratory of the Biofertilizer Production Unit, Department of Soil Science, Assam Agricultural University, Jorhat during 2017-18. The objective of this investigation was to determine the shelf-life of the liquid formulation, to study the nodulation pattern and establishment of added rhizobia in specific host legumes and to ascertain the validation of the effective liquid formulation on pea, green gram and black gram. The experiment was laid in a Completely Randomised Block Design. The individual strains of greengram(Rhiz-10) and blackgram(Rhiz-13) was diluted to different formulations of 25, 50, 75 and 100 per cent and shelf-life was examined in comparision with a solid substrate at 0, 30, 60, 90 and 120 days of incubation. Results showed that viable population of rhizobia could be maintained with different formulations even upto 120 days. Whereas, in solid substrate the viable population started decreasing more, as days of incubation increased irrespective of pulse crops . The colony forming unit in 100 per cent liquid formulation ranged from 1.2 to 3.2x108 cfu/ml in greengram and 1.7 to 2.4x108 cfu/ml in blackgram from 0 to 60 days of incubation. Nodulation pattern was studied in terms of infectivity test for three crops viz. pea, greengram and blackgram under sterile condition using Gibson tube method. The three rhizobial strains (Rhiz-25, Rhiz-10 and Rhiz-13) of different concentrations of 25, 50, 75 and 100 per cent was prepared and inoculated in tubes and some tubes were kept as control. At 20th day of inoculation, nodule number, nodule dry weight and establishment (cfu/nodule) was found to be highest for all the three crops on application of 100 per cent liquid formulation. The establishment of rhizobia per nodule at 100 per cent liquid formulation for pea, green gram and blackgram was recorded to be 5.6, 7.3 and 5.0x103 cfu/nodule respectively. For validation, a pot culture study was conducted using pulses like pea, greengram and blackgram under unsterile condition with respective rhizobial formulation of 50 and 100 per cent concentration. The replicated plants were grown for 60 days and thereafter harvested. The results showed that nodulation pattern (nodule number and dry weight), and yield parameters increased significantly over uninoculated control at 50 and 100 per cent formulation. Rhizobia got well established in treated pots. Further, enzyme activities of the soil with respect to inoculated crops also increased indicating enhanced rhizobial activity. The numerical data on yield recorded for pea, greeengram and blackgram were 25, 18 and 12 pods per plant at 100 per cent rhizobial formulation. Similarly, enzyme activities also increased from 26.66 to 35.52 μg TPF g-1 24 h-1 DHA, 1.63 to 2.57 μg fluorescein g-1 30 mins-1 FDA and 12.12 to 16.58 μg p-nitrophenol/gm/hr PMEase for soil grown with pea at 100 per cent rhizobial formulation and similar trend of result also showed in soil planted with greengram and blackgram.