The study looked at how continuous farming affects soil structure in Darling Downs, Queensland. They examined two types of soil and found that cultivation led to a decrease in organic carbon and nitrogen levels. However, the size and strength of soil aggregates remained within a good range, suggesting that further degradation is unlikely. Wet sieving showed a decrease in water-stable structural units due to cultivation, but they stabilized after around 15-20 years. Overall, the study suggests that while cultivation can impact soil structure, it may not severely limit productivity in these areas.