Effects of plant density on maize yield on the Atherton Tableland, Queensland

Abstract

From 1953 to 1961, the open-pollinated maize variety Kairi Durum grown at 11,900 plants per ac showed an average yield advantage of approx. 6 bus over lower density stands. Yields of the hybrid GH128 were sensitive to plant density in 1959, but were independent of treatment in 1961, when abnormally dry conditions prevailed, and in 1962, when tropical rust was prevalent. With currently available hybrids, plant densities above 14,000 plants per ac are not recommended, due to the possibility of lodging.