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University of Agricultural Sciences, Bengaluru

University of Agricultural Sciences Bangalore, a premier institution of agricultural education and research in the country, began as a small agricultural research farm in 1899 on 30 acres of land donated by Her Excellency Maharani Kempa Nanjammanni Vani Vilasa Sannidhiyavaru, the Regent of Mysore and appointed Dr. Lehmann, German Scientist to initiate research on soil crop response with a Laboratory in the Directorate of Agriculture. Later under the initiative of the Dewan of Mysore Sir M. Vishweshwaraiah, the Mysore Agriculture Residential School was established in 1913 at Hebbal which offered Licentiate in Agriculture and later offered a diploma programme in agriculture during 1920. The School was upgraded to Agriculture Collegein 1946 which offered four year degree programs in Agriculture. The Government of Mysore headed by Sri. S. Nijalingappa, the then Chief Minister, established the University of Agricultural Sciences on the pattern of Land Grant College system of USA and the University of Agricultural Sciences Act No. 22 was passed in Legislative Assembly in 1963. Dr. Zakir Hussain, the Vice President of India inaugurated the University on 21st August 1964.

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20161
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Subject: Soil Science and Agriculture Chemistry × Author: SANDHYA, K. × Start date: 1978 × Type: Thesis × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    BIOGEOCHEMISTRY OF SILICON IN DIFFERENT RICE ECOSYSTEMS OF KARNATAKA
    (UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU, 29-12-12) SANDHYA, K.; Prakash, N. B.
    In order to understand biogeochemistry of silicon (Si), plant available Si (PAS) content was analysed in soils of different agro climatic zones of Karnataka besides conducting pot and field experiments to know the efficacy of different sources of Si and its bioavailability in rice ecosystem. Plant available Si content ranged from 1.41-82.89 mg kg-1 as extracted by calcium chloride (CCSi) and 6.69-370.24 mg kg-1 as extracted by acetic acid (AASi). Pearson’s correlation coefficient worked out for soil analytical data revealed a significant positive correlation between PAS and soil pH, silt, clay, cation exchange capacity and negative correlation with sand content. XRay Diffraction analysis of the soil samples revealed the presence of quartz, feldspars, amphibole, phyllosilicates as primary minerals and smectite, kaolinite, illite, vermiculite as clay minerals in various proportions. AASi was positively correlated with Al2O3, Fe2O3, MnO and TiO2 demonstrating the extractant assessed the fraction of Si adsorbed on the surface of oxides or oxy-hydroxides and clays while, CCSi for immediate dissolved Si. Application of diatomite @ 300 kg ha-1 significantly increased the grain yield and numerical increase in other yield attributes in the field experiment. Budgeting of Si in a rice ecosystem revealed that majority of the biogeochemical cycle of Si was controlled by uptake, dissolution and contribution by irrigation water. Bioavailability of Si for rice in acidic, neutral and alkaline soil revealed that application of calcium silicate, diatomite and rice husk biochar significantly increased the yield parameters. Higher Si uptake was noticed in neutral soil followed by acidic and alkaline soil. In acidic and neutral soil, application of calcium silicate significantly increased the nutrient status of soil whereas rice husk biochar in alkaline soil and justifies the variability in reactivity of the sources in different soils rather than total Si content.
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    ThesisItemOpen Access
    BIOGEOCHEMISTRY OF SILICON IN DIFFERENT RICE ECOSYSTEMS OF KARNATAKA
    (UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU, 2016-12-29) SANDHYA, K.; Prakash, N. B.
    In order to understand biogeochemistry of silicon (Si), plant available Si (PAS) content was analysed in soils of different agro climatic zones of Karnataka besides conducting pot and field experiments to know the efficacy of different sources of Si and its bioavailability in rice ecosystem. Plant available Si content ranged from 1.41-82.89 mg kg-1 as extracted by calcium chloride (CCSi) and 6.69-370.24 mg kg-1 as extracted by acetic acid (AASi). Pearson’s correlation coefficient worked out for soil analytical data revealed a significant positive correlation between PAS and soil pH, silt, clay, cation exchange capacity and negative correlation with sand content. XRay Diffraction analysis of the soil samples revealed the presence of quartz, feldspars, amphibole, phyllosilicates as primary minerals and smectite, kaolinite, illite, vermiculite as clay minerals in various proportions. AASi was positively correlated with Al2O3, Fe2O3, MnO and TiO2 demonstrating the extractant assessed the fraction of Si adsorbed on the surface of oxides or oxy-hydroxides and clays while, CCSi for immediate dissolved Si. Application of diatomite @ 300 kg ha-1 significantly increased the grain yield and numerical increase in other yield attributes in the field experiment. Budgeting of Si in a rice ecosystem revealed that majority of the biogeochemical cycle of Si was controlled by uptake, dissolution and contribution by irrigation water. Bioavailability of Si for rice in acidic, neutral and alkaline soil revealed that application of calcium silicate, diatomite and rice husk biochar significantly increased the yield parameters. Higher Si uptake was noticed in neutral soil followed by acidic and alkaline soil. In acidic and neutral soil, application of calcium silicate significantly increased the nutrient status of soil whereas rice husk biochar in alkaline soil and justifies the variability in reactivity of the sources in different soils rather than total Si content.