These nutrients include nitrogen (N), phosphorus (P), and potassium (K) and are most commonly found to be deficient in poor soils. Mismanagement of these nutrients is not only bad for crop production but can also be harmful to the environment. Excessive use of fertilizers, manures and sludges, composts, etc. can lead to groundwater contamination issues. This is one reason why research into the optimal use of macronutrients in crop production is necessary and why so much time goes into researching these vital nutrients.
Find the most profitable N rate based on research here
Additional information: Tri-State Fertilizer Recommendations