Abstract
Recent studies on maize in Nigeria showed that the new ‘FARZ series’ of maize, which were specially bred for high yield, respond to high density treatments (Lucas, 1981; Remison & Lucas, 1982). The optimum maize grain yields were obtained by these workers at density treatments 6·6 and 5·3 plants/m2. Prior to the release of these varieties, optimum grain yields were obtained between 3·7 and 4·3 plants/m2 (Fayemi, 1963; Chinwuba, 1967).