The Tri-State field crop fertilizer recommendations for Indiana, Michigan, and Ohio were originally published in 1995. After research and on-farm trials the recommendations have recently been revised and updated. Documentation for the revised recommendations can be found in the following link, Tri-State Fertilizer Recommendations for Corn, Soybeans, Wheat, and Alfalfa. Ohio State University has provided a Quick Reference Guide to the Tri-State fertilizer recommendation changes.
Significant changes were made to both the phosphorus and potassium recommendations and the soil pH and lime recommendations. Updated calculators and nutrient scripts were added to Field360 Studio to reflect the recommendation changes. The original Tri-State calculators and nutrient recommendation scripts still remain in Field360 Studio as an option for use. In the Advanced Nutrient Recommendations extension one will see six scripts for Tri-State recommendations.
1 . Tri-State Calculator (Harvest) 4. 2020 Updated Tri-State Calculator (Harvest)
2 . Tri-State Calculator (Yield Target) 5. 2020 Updated Tri-State Calculator (Yield Target)
3. Tri-State Calculator Lime Calculator 6. 2020 Updated Tri-State Calculator Lime Calculator
The updated calculators and Scripts in Field360 Studio attempt to replicate the University recommendation as close as possible. Below is a list of major changes reflected in the updated calculators