Redox potential A measure of soil’s tendency to gain or lose electrons, reflecting oxidation-reduction conditions.
Relative humidity The amount of water vapor in the air relative to the maximum it could hold at a given temperature.
Remote sensing The use of satellite or aerial sensors to collect information about land, vegetation, and soils from a distance.
Renewable resource A natural resource that can be replenished within a human lifetime, such as soil fertility, forests, or groundwater.
Respiration The metabolic process by which organisms release energy by breaking down organic compounds with oxygen.
