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Molybdenum Availability as Influenced by Application of Fly Ash to Soil¹

ABSTRACT

Relationships between fly ash application to soil and Mo availability were evaluated by greenhouse and laboratory procedures. Seventeen samples of fly ash under study ranged from 5.6 to 39.3 ppm in total Mo content. Thirteen of the fly ash samples were alkaline in reaction, and these samples neutralized from 0.01 to 3.74 meq H₃O⁺/g. Incorporation of two samples of fly ash, which contained the extremes in the range of total Mo content, increased alfalfa (Medicago sativa L.) yield on an acidic Groseclose silt loam. The increase in yield was attributed to alleviation of toxicities associated with low levels of soil pH. Molybdenum uptake data indicated approximately equal availability of Mo in fly ash and in Na₂MoO₄·2H₂O.

Key Words: by-product utilization • Mo availability • coal-burning power plants

¹ Contribution from the Department of Agronomy, Research Division, Virginia Polytechnic Institute and State University, Blacksburg 24061. The investigation was conducted in cooperation with the Morgantown Coal Research Center, US Bureau of Mines, Morgantown, W. Va., and was supported by the US Bureau of Mines Solid Waste Disposal Grant SWD-14.

² Research Assistant and Associate Professor of Agronomy, respectively.

Received for publication May 21, 1971.

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