Dear Datta
Fly ash contain many minerals such as Zn, K, Ca, Fe, and Na which increases the productivity of Crops. Fly ash also improve soil properties such as texture, pH and WHC. But fly ash effects on Crop yield may be beneficial or toxic depending upon its contents. Regards
Fly ash is more dangerous than any chemical fertilizer, not only hazardous heavy metals come with it but also radionuclides. Keep it away from agricultural soils!
It depends on the composition of the ash generated. Heavy metals like Zn, Cu, Mn, Fe often boost up production, but Th, Ra... ooops!!!!!
Flyash can be used to reclaim soil and to enhance crop productivity depending upon the nature of soil and flyash as rightly said by Prof Mitra. It can improve the physical, chemical and biological properties of soil and enhance the available macro and micronutrients for the plants. Fly-ash has great potentiality in agriculture due to its efficacy in modification of soil health and crop performance. The high concentration of elements (K, Na, Zn, Ca, Mg and Fe) in fly-ash increases the yield of many agricultural crops. The silt dominant texture of flyash improved loamy sand to sandy loam textures of the surface soils at the farmers' fields. The increased growth in yield of crops with flyash incorporation was possibly due to modifications in soil moisture retention and transmission characteristics, bulk density, physico-chemical characters such as pH and EC and organic carbon content. The response of flyash addition in the soil on soil health and crop productivity however still need further research on long-term sustainable aspects.
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