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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
    SOIL BORON FRACTIONS AS INFLUENCED BY SELECTED SOIL PROPERTIES AND CROPPING SYSTEM IN BOKO BLOCK OF KAMRUP (RURAL) DISTRICT OF ASSAM
    (2021) Baruah, Neelom; Tamuly, Danish
    The present study was conducted with the twin objective to assess the influence of basic soil physico-chemical properties and cropping system (CS) on soil boron fractions in Boko Block of Kamrup (Rural) District of Assam. A total of twenty- four (24) geo-referenced surface soil samples (0-15 cm) were collected from across the blocks under each cropping system viz., Rice-Rice, Rice- Fallow, Vegetable-Vegetable and Plantation crops. The soil groups were found to vary in their physico-chemical properties irrespective of cropping system practised. The studied soil samples showed wide variations in texture varying from sandy clay loam (SCl) to clay loam (Cl). The ranges for pH, SOC (%), Av. Nitrogen (kg ha-1), Available P2O5 (Kg ha-1), Available K2O (Kg ha-1), CEC [Cmol (p+) kg-1], EC (dSm-1) ranged between very strongly acidic to strongly acidic (4.7-5.6), medium to high (0.6-1.6 %), Low to Medium (175.6-326.4 kg ha -1), Low to High (5.93- 57.68 kg ha -1), Medium (130.8-276.2 kg ha -1), Low (2.8-9.6 Cmol (p+) kg-1), Normal range (0.01- 0.03 ds m-1) respectively. The selected properties viz., CEC, pH and SOC were chosen based on past research findings to analyze its effect on soil boron fractions. Each of the three parameters were split in two groups: CEC (two groups-2.8-5.8 and 5.9-9.6 C mol(p+) kg-1), pH (two groups- 4.7-5.0 and 5.1-5.6) and SOC (two groups- 0.6-1.0 and 1.1-1.6 %). The data was analyzed using independent sample t-test. It was found that pH and CEC did not significantly affect soil B fraction. However, SOC had a significant effect on soil boron fraction viz., oxide bound and organic bound. In case of CS, majority of the soil properties viz., pH, soil organic carbon, available nitrogen, available phosphorus, cation exchange capacity, sand content (18.1- 49.5%) and silt content (24.1-48.4%) did not differ significantly among the cropping system. However, soil properties like available K2O content, EC, and clay (22.6-38.2%), was found to differ significantly between the cropping system. Cropping system did not significantly affect the various boron fractions in the present study. Significant positive correlation has been observed for soil organic carbon with Oxide bound B (r= 0.834**), Organically bound B (r= 0.541**), Specifically adsorbed B (r= 0.505*) and EC (r= 0.502*). A significant negative correlation has been observed in between sand and silt (r= -0.905 **) as well in sand and clay (r= -0.587**) content among the CS. The available boron (0.56 to 1.69 mg kg-1) and five boron fractions viz., Readily Soluble Boron (0.04-2.41 mg kg-1), Specifically Adsorbed Boron (0.15-1.92 mg kg-1), Oxide Bound Boron (5.18-17.41 mg kg-1), Organically Bound Boron (6.86-20.3 mg kg-1) and Residual Boron (17.73- 36.57 mg kg-1) did not differ significantly between the cropping systems. Results revealed that the relative proportion of various fraction of boron in soils are in the following order i.e. readily soluble B< Specifically adsorbed B < Oxide bound B< Organically bound B < Residual B. The Soil Quality Index for each CS were in the order: Rice-Rice (16.752)> Rice-Fallow (14.645)> Veg-Veg (12.979) > Plantation (12.742). None of the measured parameters were found to be significantly correlated with the yield of crop under the studied cropping system. The study, therefore explores the possibility of soil physico-chemical influence on soil boron fractions owing to cropping system over long period of time. The study reveals the selected soil properties influence on soil B fractions and cropping system being a non- determinant influencing any of the boron fraction studied.