Fertilizers, if you need them, are one of the best farm investments you can make- especially if used for corn. Fertilizers also are a good risk. Here's the story:
Pesek, John and Dumenil, Lloyd
"How Much Fertilizer Pays?,"
Iowa Farm Science: Vol. 7
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol7/iss10/2