Скачать или смотреть Does High Phosphate Retention Lock Up Fertiliser? The Science Explained

High #phosphate (P) retention soils are often misunderstood. Many farmers hear that high P retention means fertiliser phosphorus is “locked up” and unavailable — but that’s not what the science shows.

In this video, Dr Ants Roberts explains what phosphate retention (anion storage capacity) really measures, why it’s common in volcanic soils such as those in Waikato, Taranaki, Northland and Bay of Plenty, and how phosphorus remains plant-available through dynamic equilibrium in the soil.

You’ll learn why high P retention soils simply require more phosphorus to build fertility to the same Olsen P level, not that #fertiliser is wasted or lost.

You’ll learn:
– What phosphate retention and anion storage capacity actually mean
– Why phosphorus isn’t “locked up” in high P retention soils
– How P retention affects fertiliser strategy and Olsen P targets

Timestamps:
00:00 – Intro
00:14 – What phosphate retention is
00:29 – Anion storage capacity explained
00:40 – Phosphate availability
01:05 – Busting the myth
01:25 – What it really means
01:47 – Outro

Speaker: Dr Ants Roberts, Science Mentor at Ravensdown

Ants Roberts has spent over two decades turning soil science into practical action for Kiwi farmers. At Ravensdown, he leads agronomic research and development, has trained over 70 Field Officers, and works directly with farming shareholders to improve soil health, sustainability and farm performance.