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Selection for Yield in Bulk Hybrid Soybean Populations with Different Plant Spacings¹

Synopsis: Selection of single plants superior for yield and constant maturity was practiced in drilled 4- and 8-inch plant spacings from 6 bulk hybrid soybean populations. The progenies of these selections evaluated in replicated drilled plantings showed no yield, height nor lodging differences among spacings within crosses. Phenotypic selection in drilled plantings resulted in slightly later maturity in final evaluations than did selection in wider plant spacings.

² Associate Professor of Agronomy (Farm Crops), Iowa Agr. Exp. Sta., and Agronomist, Crops Research Division, A.R.S., U.S.D.A.

Received for publication March 19, 1957.