Soil Testing Methods: Why Calibration to NZ Conditions Is Critical
This lesson explains why soil test methods must be calibrated to New Zealand soils and farming systems to be meaningful. Dr Ants Roberts, Science Mentor, outlines how the Olsen P test has been calibrated over decades of NZ research to link soil phosphorus levels with pasture production, and why overseas soil tests often fail to provide reliable guidance under local conditions. A clear guide to understanding soil test results and fertiliser decisions.
Video details
Duration 1:31
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.