Northern Research and Demonstration Farm
A long-term experiment was established in 2013 at the Northern Research and Demonstration Farm to study the responses to nitrogen (N) and potassium (K) on continuous corn. Results of a previous long-term study with continuous corn conducted at this farm from 1963 through 2001with different N, phosphorus (P), and K fertilization rates showed a positive interaction between N and K, but not between N and P, or P and K. A deficiency of either N or K reduced the maximum yield level and also limited the yield response to increasing rates of the other nutrient. The study summarized in this report was established to further assess possible N by K interactions.
Mallarino, Antonio; Hirniak, Jackson; Oltmans, Ryan; and Schnabel, Matthew
"Continuous Corn Response to Nitrogen
and Potassium in Northern Iowa,"
Farm Progress Reports: Vol. 2016
, Article 85.
Available at: http://lib.dr.iastate.edu/farmprogressreports/vol2016/iss1/85