To enrich the seller apply small amounts of high-priced "complete"
commercial fertilizers.

Thus the average of seventy-three "Cooperative Fertilizer Tests on
Clay and Loam Soils," extending into thirty-eight different counties
in Indiana (Bulletin 155), shows 13 cents as the farmer's profit
from each dollar spent for "complete" fertilizers used for corn,
oats, wheat, timothy, and potatoes, if valued in the field at 40
cents a bushel for corn, 30 cents for oats, 80 cents for wheat, 50
cents for potatoes, and at $10 a ton for hay, over and above the
extra expense for harvesting and marketing the increase, and of
course the soil grows poorer, because the crops harvested removed
much more plant food than the fertilizers supplied.






CHAPTER IV

PERMANENT SOIL FERTILITY





Its Relation to Profits and Future Values