Available Phosphorus Distribution in IN, MI, OH and PA:

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. Percentage of farms falling in each range are listed above the distribution bars. Soils that are at lower or higher risk are indicated.

Soil available Phosphorus can influence positively the color of tomato fruits. Soils with low levels of phosphorus are at a higher risk of YSD than soils with high levels of P. Phosphorus fertilization should be based on a updated soil test.

Some important information about soil phosphorus management can be found in the following links:

Ohio Agronomy Guide Bulletin 472 - The Ohio State University

Understanding Soil Phosphorus: An Overview of Phosphorus, Water Quality, and Agricultural Management Practices - University of Wisconsin

Using Phosphorus fertilizers Effectively- University of Nebraska - Lincoln

Phosphorus in Missouri Soils - University of Missouri