pH in living soil: natural regulation around roots
The environment around a root is continually shaped by the interaction between the plant and soil organisms. In the regenerative approach taught by Dr. Elaine Ingham, restoring this relationship is a fundamental part of managing plant nutrition.
Dr. Elaine Ingham’s explanation
In an interview, Dr. Ingham explains that pH is influenced by both the mineral content and the biology of the soil.
In the same interview, she links chemical analysis with microscopic examination: the former describes soil characteristics, while the latter helps us identify which organisms are present and functioning. Soil biology contributes to nutrient cycling and shapes the environment in which the plant feeds.
Roots sustain the relationship
Through their exudates, roots supply microorganisms with sugars and other compounds. Bacteria and fungi use these resources and help decompose organic matter. When protozoa and other organisms consume them, nutrients are released that plants can take up.
The Soil Food Web School emphasizes the presence of different feeding groups and their balance in relation to the plant species.
The school also links beneficial fungal activity with localized acidification and changes in nitrogen transformations. Microbiology therefore influences both the chemical environment and the forms of nutrients available.
Different pH values around the same root
A measurement from a soil sample provides useful information, but does not capture all the small zones around living roots.
In an experimental study by Heckman and Strick, colour indicators revealed pH changes in the rhizosphere and differences along roots. Ammonium uptake favoured acidification, whereas nitrate uptake favoured an increase in pH. These local changes could occur without an immediate corresponding change in the surrounding bulk soil.
Our priority in regenerative agriculture
Our approach focuses on restoring a functioning soil food web, allowing the natural processes of roots and microorganisms to contribute to regulating the local nutrient environment.
This is the self-regulation we seek. Its extent also depends on the plant species and on soil properties, which influence how readily its pH changes.
Connection with our field work
At our Center, we monitor soil microbiology and produce compost and liquid derivatives, following our training at the Soil Food Web School. We aim to support the root and microbial processes that influence rhizosphere pH. The effect depends on the soil, plant and conditions and requires monitoring; an application does not automatically ensure a suitable pH.