28/01/2026
🕵️♂️ Is your soil pulling a fast one on your phosphorus?
You might be applying plenty of phosphorus, but your soil could be holding onto it tighter than expected. The key culprit? PBI (Phosphorus Buffering Index).
PBI measures how strongly your soil binds phosphorus.
🔒 High PBI soils tie up a large proportion of applied P, meaning more fertiliser is needed to lift fertility.
🔓 Low PBI soils bind very little P, so plants can use fertiliser much more efficiently.
If PBI isn’t part of your soil testing, you could be spending on fertiliser without seeing the pasture response you expect. Understanding your soil’s PBI helps you fine-tune rates, improve efficiency and get better value from every dollar applied.
👉 Find out if your soil is locking up your phosphorus and what you can do about it: https://info.futurebeef.com.au/49Bvoh7
Meat & Livestock Australia
Australian Department of Agriculture, Fisheries and Forestry