A mechanism for potassium movement
in the soil is diffusion (moving
from high concentration to a lower
concentration). When soil has low
levels of exchangeable K (Kex), nonexchangeable (Knex) will diffuse from
the soil layers and add to Kex levels. See Image A (1). This results in an
elevated standard K test result relative to the wet K test results. When soil
has high levels of exchangeable Kex, Kex will diffuse into the layers to add to
Knex. See Image A (2). This results in a reduced standard K test relative to a
wet K sample.
Temperature Impa