Many farmers believe nitrogen fertilizer is rapidly lost from the soil. In some areas it is. But 4 years of tests in Iowa have shown that both nitrogen carry-over and resulting increased yields may be greater than you expect.
Dumenil, Lloyd and Nicholson, R. P.
"Nitrogen Carry-Over? More Than You Think!,"
Iowa Farm Science: Vol. 6
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol6/iss9/3