Tomato Genetics and Breeding Program       

  "Hartz" Ratio                                  

  Project Objectives

Color Disorders 

Presentations   Color Disorders vs. Soil    Preliminary Results  "Hartz" Ratio Calculator Related Links Participants


To know if your soil is at low risk of YSD, enter the information below based on the standard test results of your soil. 

Please enter the values for Phosphorus (P), Potassium (K), Magnesium (Mg), Calcium (Ca), Cation Exchange Capacity (CEC), and the units used by the laboratory.



Mg ppm
Ca lb/acre
CEC Kg/ha

The results are presented below. You can compare your results with the most desirable values for soils at low risk of YSD (values on right side in green).

Your results Course Textured Soil at low risk of YSD  (Midwest , USA) Fine Textured Soil at low risk of YSD  (Midwest , USA)    Soil at low risk of YSD

 (California, USA) 

Extractable K cmol/kg  
Hartz ratio  
K % of the CEC  
Ca/Mg Ratio  
Available P ppm      


Information presented herein is supplied with the understanding that no endorsement by Ohio State University/OARDC is implied. The authors have assembled the most reliable information available to them at the time of publication. The Ohio State University/OARDC assumes no liability for recommendations offered herein.

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