Former Graduate Student.
Assistant Professor of Agronomy.
Research Agronomist, Field Crops Laboratory.
Assistant Professor of Horticulture.
Received for publication 9 Apr. 1983. Contribution from the Agron. Dept., Univ. of Maryland as Scientific Paper No. 3461 and Contribution No. 6534 of the Maryland Agr. Expt. Sta., College Park, Md. 20742. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
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