Eight bar graphs showing P-index for each site and responses in plant height (inches, tan bars) and yield (bushels per acre, green bars) to control, starter N, and starter NP.

Figure 1. Effect of starter fertilizers on corn seedling height and corn yield over eight site-years. Note that means with the same letter are not significantly different by the Tukey HSD test (P < 0.05). (Height data was unavailable for the Beaufort County site.)