Water Use Efficiency (WUE) has long been a cornerstone measure for grain growers, particularly in dryland farming systems across southern Australia. In an environment where rainfall is often the most limiting and variable factor, understanding how effectively that rainfall is converted into crop production is critical. WUE provides a simple yet powerful way for farmers to assess performance, refine management practices, and ultimately improve productivity over time. The concept of Water Use Efficiency dates back to the early 1980s, when two scientists—Reg French and Jeff Schultz—set out to better understand what constrained grain yields in dryland systems. Their research led [...]