The following plots show the distribution of
pH, organic matter, exchangeable Potassium and "Hartz" ratio for the Midwest,
including farms from Indiana, Michigan, Ohio and Pennsylvania. The distribution
plots are based on soil tests sent to us by tomato growers and collaborators and
show the diversity of soil characteristics of this region.
We are now investigating
the role of soil nutrients on the occurrence of YSD based on soil and fruit
color data collected in 2001-2002. For each distribution plot, we have indicated
the range of values where lower or higher risk of yellow shoulder disorder may
occur. These are preliminary results and more research is needed to fully
understand the occurrence and management of color disorders in tomatoes.