The environmental guidelines for the use of coal ash in agriculture distinguish between fly ash used for soil improvement and bottom used as a growth medium for plants. While the present guidelines require site-specific investigation of the effect of each application on the environment and the agricultural product, the upgraded guidelines for fly ash set threshold conditions based on a model for Boron, Vanadium, Selenium and Molybdenum (most soluble micro-elements in fly ash) mobility in soil under known environmental conditions, which was developed for that purpose. Growing edible crops on a medium containing coal ash requires an approval of the Food & Nutrition Services.
To view “Environmental guidelines for the use of coal ash in agriculture”