In the current agricultural climate of low commodity prices and increased fertilizer costs, we keep hearing about nutrient use efficiency (NUE) as a key component of farming success. NUE is commonly defined as the yield per unit of input. But why is it important? To illustrate this, let’s use the analogy of two pick-up trucks. NUE is the difference between one truck getting 20 MPG compared to a different truck of the same make and model getting 35 MPG by using a higher-quality fuel source.