Does High Phosphate Retention Lock Up Fertiliser? The Science Explained
This lesson explains phosphate retention and anion storage capacity, focusing on high P retention soils common in New Zealand’s volcanic regions. Dr Ants Roberts, Science Mentor, clarifies why phosphorus is not “locked up,” how dynamic equilibrium keeps P available to plants, and why higher P inputs may be needed to reach optimal Olsen P levels. A practical guide to understanding phosphate retention and making informed fertiliser decisions.
Video details
Duration 1:52
Presented by
Dr Ants Roberts
Science Mentor
Dr Ants Roberts is a Science Mentor at Ravensdown and a recognised authority on soil fertility management with more than four decades of experience. He leads agronomic research and development, works directly with farming shareholders, and trains Agri Managers and staff in soils, fertilisers and pastoral agriculture.