Nutritional investigations in irrigated maize on some black earth soils, Darling Downs, Queensland

Abstract

Results of 5 fertilizer trials at 4 localities to determine nutrient deficiencies and assess fertilizer requirements are summarized. Significant grain yield responses in maize were obtained only to N and, in one locality, to P. Zn unavailability may occur sporadically on irrigated country. K, Mn, B, Mo and Fe had no effects on foliage or grain yields. In P-deficient areas, N and P are required in combination to secure highest yields.