Applying fertilizer in the fall is relatively new in Iowa. Many farmers like the idea of getting it out of the way before their busy spring season. Truck spreading and custom applications of liquid nitrogren materials are easier in the fall than in the wetter spring. Fertilizer movement in the fall gives more efficient fertilizer production and distribution. And fall application is encouraged in some areas by lower prices of fall delivery.
Dumenil, Lloyd; Meldrum, H. R.; and Pesek, John
"When to Fertilize? Fall or Spring,"
Iowa Farm Science: Vol. 9
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol9/iss3/2