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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: Agricultural Meteorology × Author: Hazarika, Sangeeta × End date: 2019 × Start date: 2015 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    DRY AND WET SPELL ANAYSIS FOR CROP PLANNING IN UPPER BRAHMAPUTRA VALLEY ZONE (UBVZ) OF ASSAM
    (AAU, Jorhat, 2019-07) Hazarika, Sangeeta
    The present research work was carried out for five districts under Upper Brahmaputra Valley Zone of Assam (UBVZ) to find out the probabilities of occurrence of dry and wet spells and onset and withdrawal of rainy season to suggest suitable crop planning in the region. Long term rainfall data were collected from Department of Agrometeorology, AAU, Jorhat and IMD, Pune for all the districts. The probability analysis was carried out by using Markov chain model which calculates the initial, conditional and consecutive probability of occurrence of dry and wet spell and onset and withdrawal of rainy season were determined by using forward and backward accumulation method, result pertaining to which was used for crop planning in different growing season over the region. The highest annual rainfall was recorded in Dibrugarh district (2590.2mm) followed by Tinsukia (2475.7mm), Sivasagar (2022.0 mm), Jorhat (1923.5mm) and lowest in Golaghat (1648.2mm). Seasonal rainfall analysis indicated that, monsoon season receives the highest amount of rainfall with least CV and the winter records the lowest rainfall with a higher CV in all the districts. From the result of initial probability, it was found that there was higher chances of occurrence of wet spell of minimum 10mm of threshold limit from 12th SMW (19th – 25th March) to 41st (8th – 14th Oct) and 42nd SMW( 15th – 21st Oct) in all the districts. The consecutive probability of occurrence of wet spell of two weeks is more than 50% from 13th (26th march – 1st April) and 15th SMW (9th – 15th April) onwards in Sivasagar and Golaghat, respectively whereas the such condition occurs from 12th SMW in rest of the three districts. There was higher chances of getting wet spell of three consecutive weeks of more than 40mm rainfall at different periods in Jorhat (26th – 28th SMW), Sivasagar (25th – 28th ), Dibrugarh (23rd – 31st ) and Tinsukia(22nd – 29th , 31st , 32nd SMW), which may lead to flood like condition in the districts. So, water harvesting of the excess moisture as well as provision of drainage in the crop field is suggested during the aforesaid period. The probabilities of occurrence of dry spell were higher before 12th SMW and after 42nd SMW, but during monsoon season it was found to be very less which indicates that Kharif crops can be grown without any supplemental irrigation. Considering forward accumulation from 9th SMW there was accumulation of 75 mm and 200 mm of rainfall within 13th – 15th SMW and 16th – 19th SMW, respectively in all the districts which indicates that sowing of summer crops can be started within these weeks. Considering forward accumulation from 22nd SMW it was found that within 23rd – 24th SMW and 25th – 26th SMW, there was accumulation of 75mm and 200 mm rainfall, respectively in the districts. The mean week for end of rainy season was found to be within 34th – 37th SMW (20th Aug – 16th Sept) for 300mm rainfall and 31st to 35th SMW (30th Aug – 2nd Sept) for 500 mm rainfall for all the districts. It indicates that delayed sowing of rice crop may be done latest by the week on which rainy season ends after backward accumulation of 500 mm of rainfall. On the other hand sowing of short duration crops with low water requirements may be done latest by the week on which there will be backward accumulation of 300mm of rainfall. Sowing of summer crops such as greengrm, blackgram, ahu rice were suggested to complete within 12th SMW onwards for all the districts. Nursery bed preparation for Sali rice can be started as early as 18th SMW in the district of Jorhat, Dibrugarh and Tinsukia. Sowing of Kharif greengram blackgram could be started after 34th SMW and Rabi crops and sowing of vegetables could be started after 40th SMW.