If the price of fertilizer falls, the cost of production of the corn would also fall. Therefore I would say that, based on a straight supply and demand curve your quantity would go up and your price would go down

This is hilarious. Someone just revived a thread I started 2 years and 4 months ago so that they could get help with something that looks suspiciously like a homework question.
Still working at a company peripherally related to banking. Still following this board. Fascinating reading here.