Surface Phosphorus-Index Thresholds
Requiring Deep Soil Sampling

As the concentration of extractable phosphorus increases in the surface soil, the risk of P moving deeper into the soil becomes more likely. The capacity of a soil to retain P is a related to the amount and type of clay at the surface. Some soils are more at risk for the downward movement of P whereas other soils have only a minimal risk.

This reporting tool can assist nutrient management planners determin which fields need a deep soil sample in order to properly complete the planning process. To build a table of surface P thresholds, select a county. A report will be generated showing the soil mapping units in that selected county where P leaching is a concern. For each map unit, a deep soil sample is required if the surface-collected soil sample has a P index greater than the reported P threshold.


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Surface Phosphorus-Index Thresholds Requiring Deep Soil Sampling in County

Unable To Generate a List Of Soils. Please select a county
Soil Mapunit P Threshhold
(Soil Test Index)