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Progress from Adaptive Mass Selection in Incompletely Adapted Maize Populations¹

Increasing genetic variation by the use of exotic germlasm is commonly recognized as desirable. Methodology or large scale application of this principle to maize (Zea mays L.) has not been very well developed. This study shows that mass selection for adaptation and prolificacy can result in yield increases without necessarily changing other traits which usually show correlated responses to selecton for yield alone. Mass selection for adaptation and prolificacy resulted in increases in yield, plant height, and ear height, slight increases in days-toflower and ears-per plant, and no change hi grain moisture at harvest.

Key Words: Exotic germplasm • Yield • Plant traits • Genetic variation • Zea mays L.

² Professors of agronomy and former graduate research assistant (now at Kalimati, Kathmantu, Nepal).

Received for publication December 19, 1978.