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Management of Lignite Fly Ash for Improving Soil Fertility and Crop Productivity

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Abstract

Lignite fly ash (LFA), being alkaline and endowed with excellent pozzolanic properties, a silt loam texture, and plant nutrients, has the potential to improve soil quality and productivity. Long-term field trials with groundnut, maize, and sun hemp were carried out to study the effect of LFA on growth and yield. Before crop I was sown, LFA was applied at various doses with and without press mud (an organic waste from the sugar industry, used as an amendment and source of nutrients). LFA with and without press mud was also applied before crops III and V were cultivated. Chemical fertilizer, along with gypsum, humic acid, and biofertilizer, was applied in all treatments, including the control. With one-time and repeat applications of LFA (with and without press mud), yield increased significantly (7.0–89.0%) in relation to the control crop. The press mud enhanced the yield (3.0–15.0%) with different LFA applications. The highest yield LFA dose was 200 t/ha for one-time and repeat applications, the maximum yield being with crop III (combination treatment). One-time and repeat application of LFA (alone and in combination with press mud) improved soil quality and the nutrient content of the produce. The highest dose of LFA (200 t/ha) with and without press mud showed the best residual effects (eco-friendly increases in the yield of succeeding crops). Some increase in trace- and heavy-metal contents and in the level of γ-emitters in soil and crop produce, but well within permissible limits, was observed. Thus, LFA can be used on a large scale to boost soil fertility and productivity with no adverse effects on the soil or crops, which may solve the problem of bulk disposal of fly ash in an eco-friendly manner.

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Acknowledgments

The authors are grateful to the Standing Scientific Research Committee, Department of Coal, Ministry of Coal, Government of India, for providing financial assistance and to the director of CFRI and NLC authorities for providing infrastructural facilities. They also thank the director of CFRI for permitting this paper to be published.

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Correspondence to Lal C. Ram.

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Ram, L.C., Srivastava, N.K., Jha, S.K. et al. Management of Lignite Fly Ash for Improving Soil Fertility and Crop Productivity. Environmental Management 40, 438–452 (2007). https://doi.org/10.1007/s00267-006-0126-9

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  • DOI: https://doi.org/10.1007/s00267-006-0126-9

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