Documentation of crop yields and varieties in the Toowoomba Royal Agricultural Show Irrigated Crops Competition since 1972 demonstrates the great advances achieved by cotton breeders as new varieties have been introduced to the industry. Data is based entirely on commercial crops entered in the competition on the Darling Downs. Agronomic data for those crops collected since 1987 also provides an interesting documentation of commercial crop management on the Darling Downs. Unfortunately, previous crop history, which influences nutrition inputs, and insecticide applications were not recorded, depriving us of a more complete picture. Crop yields are determined from the field area, precisely measured, required to produce a full module. The module is then weighed and ginned commercially at the ginnery