Abstract
Maize cultivars from Africa and the U.S.A. were grown in replicated trials in West Africa from 1972 to 1974. Each year, regression coefficients were calculated giving responses to environmental indices based on location mean yields. Entries with high mean yield generally bad regression coefficients exceeding unity and were equal to or better than entries having smaller responses even at poor locations. Mean location yields were positively correlated with rainfall and showed strong negative correlations with day and night temperatures, though varieties responded differently. Anthesis was not consistently affected by night temperatures but was delayed by high day temperatures and low rainfall which are characteristics of northerly locations in West Africa.
