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Birsa Agricultural University, Ranchi

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Subject: Soil Science and Agriculture Chemistry × Author: Arvind Kumar × End date: 1997 × Start date: 1993 × Type: Thesis ×
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    ThesisItemOpen Access
    Effect of Flyash on Growth and Nutrient Accumulation in Certain Crops and Tree Species and Its Impact on Soil Health
    (Birsa Agricultural University, Ranchi, 1997) Arvind Kumar; A.K.Sarkar
    Fly ash is chemically an amorphous ferro alumino silicate and is an important pollutant in the industrial areas. Bulk of the flyash generated by steel & thermal power plants are used in making bricks, road making and in cement refractory product. Fly ash contains many nutrients essential for plant growth, which could be made use of in increasing crop productivity. but the results have been inconsistent over the ears only recently some valuable information have been generated at this University, through green house experiments with soybean and rice. The present research work is an extension of these studies with field, pot culture and laboratory experiments. The objectives of the present investigation were: 1. Characterization of fly ash obtained from different sources. 2. Yield and uptake of trace metals by cereal and pulse crops grown in flyash amended soils. 3. Influence of flyash on trace metal availability in acid soils. 4. Growth parameters and trace metal content of tree species grown in flyash amended soils. The salient results obtained may be summarized: 1. Properties of flyash varied with the source. Bokaro fly ash was moderately acidic in reaction. IC and ++ exch. Ca++ were high. Flyash was rich in total macro- and micro-nutrients except nitrogen. High available P, K and s and DTPA extractable micro nutrients were found in fly aah samples. content of Pb, Ni and co in Elyash were considerably higher than that in soils. 2. Grain yield of rice, wheat and soybean was higher in 8 to 16% fly ash amended soil compared to soil alone. At recommended level of NPK, flyash favourably influenced crop yields. 3. soils amended with flyash upto 16% level increased the availability of cationic micronutrients in soil and its uptake by crop plants. 4. In onion, flyash increased plant height, total soluble salts and bulb weight at 100 t ha-1 level. Fly ash application increased available B in soil & content in onion bulbs. 5. Growth of tree species such as subabul, chalundi, Karanj, Black siris, shisham and Gamhar in soils alended with 20% flyash was superior than soil alone. Leguminous tree species performed better in this regard. 6. Absorption and translocation of trace metals differed considerably among tree species grown in flyash amended soiled among trace metals higher Ni (2 to 4 mg kg), Pb (2 to 5 mg kg-¹) and Co (6 to 14 mg kg) content in leaves of tree species is a matter of concern. Two tree species, chalundi and Karanj performed better than others at 50% flyash (w/w) level. 7. Flyash addition in acid soil had considerable residual effect as judged by crop yield and uptake of trece metals. It is concluded that: 1. Fly ash upto 16% level can be effectively utilized for increasing crop yield and availability of soil nutrients. Co-application of fertilizers and organic manures is highly beneficial. 2. Fly ash addition enriches soil trace metal availability. 3. Fly ash application at 100 t ha-1 increases plant height of onion with increase in content of boron in onion bulbs and available boron in acid soil. 4. Leguminous tree species can be successfully grown upto 20% £ly ash level. 5. monitoring of trace metals (esp. Ni & Co) in crops and tree species grown in flyash dumps is essential to avoid contamination of soil-plant-animal food chain.