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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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20191
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Subject: Agronomy × Author: PHUKAN, JIMNI × Start date: 2010 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    EFFECT OF PLANT GROWTH-PROMOTING RHIZOBACTERIA AND WEED MANAGEMENT IN DIRECT-SEEDED UPLAND RICE
    (AAU, Jorhat, 2019-07) PHUKAN, JIMNI; Deka, Jayanta
    A field experiment entitled “Effect of Plant Growth-promoting Rhizobacteria and Weed Management in Direct-seeded Upland Rice” was carried out at Instructional-cum-Research Farm (ICR), Assam Agricultural University, Jorhat during autumn season of 2018 with a view to study the effect of plant growth-promoting rhizobacteria and weed management practices on weed, crop growth and yield of direct seeded upland rice. The experiment was laid out in factorial randomized block design with three replications. The treatments consisted of three PGPR inoculations viz., Bacillus cereus (P1), Pseudomonas fluorescens (P2) and no inoculation (P3) and four weed management practices viz., Pretilachlor @ 0.75 kg/ha (W1), Pretilachlor @ 0.75 kg/ha followed by 1 hand weeding at 30 DAS (W2), three hand weedings at 15, 30 & 45 DAS (W3) and weedy check (W4). The soil of the experimental site was sandy loam, acidic in reaction (pH: 5.5), medium in organic carbon (0.54%), low in available N (191.0 kg/ha), P2O5 (22.28 kg/ha) and K2O (107.05 kg/ha). The weed flora of the experimental field comprised of Eleusine indica, Digitaria setigera, Cynodon dactylon, Cyperus difformis, Cyperus rotundus, Ageratum houstonianum, Commelina diffusa, Oldenlandia corymbosa, Spermacoce articularis, Cleome rutidosperma, Mimosa pudica and Acmella ciliata. The density and dry weight of weeds were lowest with Pseudomonas fluorescens among PGPR treatments. The plant height, number of tillers, plant dry matter accumulation, panicle length, number of panicles and number of grains were significantly improved due to Pseudomonas fluorescens. The highest grain and straw yield of rice were recorded with Pseudomonas fluorescens. Bacterial populations in soil, phosphomonoesterace and dehydrogenase activity were enhanced by Pseudomonas fluorescens but fungal population in soil was increased by Bacillus cereus. Single application of Pretilachlor @ 0.75 kg/ha or application of Pretilachlor @ 0.75 kg/ha followed by 1 hand weeding at 30 DAS resulted least density and dry weight of weeds at initial stages but in later stages of crop growth, lowest values were recorded in three hand weedings done at 15, 30 & 45 DAS. Better growth and yield attributing characters of rice with three hand weedings at 15, 30 & 45 DAS resulted in the highest grain and straw yields. Higher microbial count in soil and enzymatic activity were recorded in weedy check and three hand weedings at 15, 30 & 45 DAS. The combination of Pseudomonas fluorescens with either three hand weedings at 15, 30 & 45 DAS or Pretilachlor @ 0.75 kg/ha followed by 1 hand weeding at 30 DAS was found to be superior with grain and straw yield. Similar trend was also achieved in gross and net returns. The benefit : cost ratio was highest with the combination of Pseudomonas fluorescens with Pretilachlor pre-emergence @ 0.75 kg/ha followed by 1 hand weeding at 30 DAS.