This study evaluated the effect of increased soil fertility on soybean seedling disease in Ohio over two years. In field trials, no significant differences in stand or yield were found with phosphorus, potassium, or combined additions. However, one site had significantly more damping-off with potassium. A survey found trends of more oomycete pathogens recovered from fertility treatments. Greenhouse studies showed slightly lower root and plant weights with fertility treatments in some trials. Overall, the study found limited effects of increased fertility on seedling disease under field conditions.