Figure 1: Fitted wheat yield relationship curves for P and K, showing the Index ranges and the potential yields at the bottom of Index 1 and in the upper half of Index 0.

Figure 1: Fitted wheat yield relationship curves for P and K, showing the Index ranges and the potential yields at the bottom of Index 1 and in the upper half of Index 0.

Figure 1: Fitted wheat yield relationship curves for P and K, showing the Index ranges and the potential yields at the bottom of Index 1 and in the upper half of Index 0.