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5 years ago in Soil Science , Waste Valorization By Pragya Chauhan
Is it beneficial to add pond ash from thermal power stations to soils?
We have a large source of pond ash from a local thermal plant and are exploring circular economy options. The literature is conflicting: some studies show improved crop yields, others warn of heavy metal toxicity. For a practical field application, what are the key soil parameters and ash characteristics we must analyze to make a safe and beneficial recommendation to farmers?
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By Pravin Patel Answered 2 years ago
Having conducted field trials with various industrial wastes, I can say the outcome hinges entirely on pre-application characterization. The benefits improved texture and water retention in sandy soils are real. However, I have seen cases where uncharacterized ash introduced phytotoxic levels of boron or mobile trace metals. I would recommend a rigorous protocol: first, a full elemental analysis and leaching test of the ash. Then, target only soils with high organic matter and clay content, which can immobilize metals. Start with very low application rates (less than 5% by volume) and implement mandatory long-term soil and groundwater monitoring to track any metal accumulation.
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