How Much Fertiliser Do You Need? Understanding Fertiliser Response & Olsen P
This lesson explains how fertiliser response works, why Olsen P is used to measure available phosphorus, and how pasture production changes as soil fertility improves. Dr Will Talbot, Scientific Officer, draws on long-term trials from Winchmore, Ballantrae and across New Zealand to show where the biggest gains occur, when the response curve flattens, and how to decide between building fertility and applying maintenance phosphorus and sulphur. A clear, practical guide to making smarter fertiliser decisions based on soil science.
Video details
Duration 2:17
Presented by
Dr Will Talbot
Scientific Officer, Ravensdown
Dr Will Talbot is a Scientific Officer at Ravensdown specialising in nitrogen and nutrient loss reduction. He studied Agricultural Science at Lincoln University, graduating with first class honours, before completing a PhD, with Deans list honours, in soil science focused on the nitrogen cycle. Dr Talbot has published multiple peer-reviewed papers that help inform smarter nutrient management across New Zealand farming systems.