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Fly ash generated from coal based thermal power plants creates environmental problems due to improper utilization and disposal. The present study was conducted to study the effects of various concentrations of FA (20, 40, 60, 80 and 100%) on the growth and photosynthetic activity of <i>Oryza sativum</i> (rice) and <i>Zea mays</i> (maize). Plant growth was mostly enhanced in the treatments with 20–40% fly ash, being optimal at 60%. From 80% onwards, the measured parameters tended to reduce. Thedoi:10.6001/biologija.v61i2.3143 fatcat:ncblqccjbbhy5horxnpfezssou