Graduate Research Assistant. Present address: Department of Crop Science, Faculty of Agriculture, Univ. of Peradeniya, Peradeniya, Sri Lanka.
Received for publication 12 June 1987. Texas Agricultural Experiment Station Technical Article 22739. Research supported in part by a grant under USAID PASA AG/TAB (USDA-82-CSRS-5-0201). 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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