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Response of Alfalfa to Boron in Flyash¹

ABSTRACT

The availability of B in flyash obtained from three coalburning power plants was evaluated by greenhouse and laboratory procedures. The samples of flyash contained 319, 415, and 618 ppm B and neutralized 0.12, 0.58, and 3.05 meq H₃O⁺/g, respectively. Boron in the samples of flyash was readily available to alfalfa (Medicago sativa L). grown on Tatum silt loam. Yield and B uptake data indicated approximately equal availability of B in flyash, 1N HCl extracts of flyash, and Na₂B₄O₇ · 10H₂O. Application of high rates of the flyash sample having the highest neutralizing power decreased yield of alfalfa. The decrease in yield was attributed to Zn deficiency of alfalfa plants induced by the increase in soil pH resulting from application of the by-product.

¹ Contribution from the Dept. of Agronomy, Res. Div., Virginia Polytechnic Inst. & State Univ., Blacksburg. 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 Former Graduate Research Assistant, now Farm Manager, Poplar Hill Research Sta., Salisbury, Md., and Associate Professor of Agronomy, respectively.

Received for publication July 17, 1970. Accepted for publication November 3, 1970.