Maize fertilizer investigations on red loam soils of the southern Darling Downs, Queensland

Abstract

Steadily declining maize yields on red loam soils indicated a depletion in nutrient status through continuous grain cropping. In a series of three field trials, marked yield responses were obtained to phosphorus (as superphosphate) application in one season, and to nitrogen (as urea) in the other two seasons. Applications of potash and mixtures of trace elements were of little significance.