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Ohio State University Extension


Fertility Calculator for Ohio Recommendations - Version Update

 An update to the Fertilizer Calculator for Ohio has been posted at The Fertilizer Calculator for Ohio (Version 2021) corrects an error in calculating whole field fertilizer cost and standardizes the width of field/subfield description fields across tool forms based on user feedback.

The tool is a Microsoft Excel spreadsheet developed to support users who want to generate their own recommendations based on the Tri-State Fertilizer Recommendations for Corn, Soybeans, Wheat, and Alfalfa, 2020. The spreadsheet is designed to be compatible with Excel version 1997-2003 or later.

Recommendations can be generated for the following crops:

  1. Corn
  2. Corn-Silage
  3. Soybeans
  4. Wheat (Grain Only)
  5. Wheat (Grain & Straw)
  6. Alfalfa
  7. Grass Hay
  8. Grass/Legume Hay

Spreadsheet features:

  • There are 21 data lines.
  • Supports copying data soil test data from another spreadsheet or within the spreadsheet.
  • User controls whether recommendations are build/maintenance or maintenance only for phosphorus (P) and potassium (K).
  • User can select appropriate critical levels for corn/soybean rotations or wheat, alfalfa, or grass legume hay rotations for P recommendations.
  • Can select a shorter or longer buildup period than standard 4 year for P & K.
  • Total fertility needs can be determined for a 1-, 2- or 3-year application on P & K Recommendation page.
  • User can compare cost of two lime sources on lime recommendation page.
  • User can determine total cost of lime needed in the recommendation developed.
  • User can determine total cost of P & K fertilizer needed to meet the nutrient recommendation.

The spreadsheet is available at:

A printed User Guide is available at:

A video demonstration at:

Crop Observation and Recommendation Network

C.O.R.N. Newsletter is a summary of crop observations, related information, and appropriate recommendations for Ohio crop producers and industry. C.O.R.N. Newsletter is produced by the Ohio State University Extension Agronomy Team, state specialists at The Ohio State University and the Ohio Agricultural Research and Development Center (OARDC). C.O.R.N. Newsletter questions are directed to Extension and OARDC state specialists and associates at Ohio State.