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Comparative Performance of Various Combinations of F₁ and F₂ Generation Seed of Maize¹

Synopsis: The presence of 20% or more of F₂ female single cross seed in an original F₁ double cross hybrid was necessary to obtain a statistically significant reduction in yield. The vigorous F₁ plants partly compensate for the loss effected by the F₂ plants.

² Agronomists, Crops Research Division, A.R.S., U.S.D.A., and Research Associates, Department of Field Crops, University of Missouri.

Received for publication June 7, 1957.