C.P.H. EMBRAPA, C. Postal (11) 1316, 70.000 Brasilia DF, Brazil.
Received for publication 10 June 1983. Journal Paper No. 9469 of Purdue Univ. Agriculture Experimental Station, West Lafayette, Ind. 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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