Graphed DataSets
Year Soil Texture Rainfall Management Group Land Use Sample Size
All All All All Cropped 45
Graph Additional DataSets
Phosphorus Buffering Index (0 - 10 cm) Overview

Phosphorus Buffering Index (PBI) is used in conjunction with the Colwell Phosphorus measurement and gives an interpretation of a soils ability to “lock-up” P. Soils with a high PBI will quickly bind P to “exchange sites” and make it unavailable for plant uptake. Conversely, soils with a low PBI will lock up only small amounts of P, leaving the majority of fertiliser applied P available for plant uptake.

Managing high PBI soils generally involves applying higher rates of P fertiliser. Doing this over many years will gradually fill more and more exchange sites, therefore leaving more fertiliser P available for the growing crop.

In some Australian soils, where PBI is particularly low, phosphorus leaching can occur.

Choose a Soil Quality indicator from one of the three tabs below to examine grouped data.

Fact Sheets Related To
Phosphorus Buffering Index (0 - 10 cm)