Fly ash contains heavy metals. Studies reported the use of fly ash in agriculture but no study reveals how much fly ash can be used as a fertilizer in the next crop season. How can one estimate the residual fly as in soil? If we use fly ash in one crop season, is it not necessary that all the fly ash can be used up? If we use the same concentration of fly ash in the next cropping season the concentration of fly ash may be increased and that may negatively affect the crop growth and germination.
Please comment on this and clear my query. Thanks.
Recently many questions about utility of fly ash in agriculture... especially if the ash contains high doses of heavy metals... read this article:
http://timesofindia.indiatimes.com/city/nagpur/Farmers-question-fly-ash-use-for-agriculture/articleshow/20547743.cms
Yes its from TOI, but once in a while they do report some truth.
I dont think this is a very good idea to use flyash in agriculture it can lead to bioaccumulation and trophic transfer of metals higher ip in the food chain and can pose serious health hazards.
Fly ash can be more effciciently utilized in construction industry for brick manufacturing. This will be much more environment friendly and cleaner production.
Fly ash can be added to the mineral deficient soils in agriculture fields as nutrient supplement. But before the application, metals quanitification (characterization) is must as to assess the concentration of metals in the ash. Long term treatment (exposure) may cause bioaccumulation.
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