Condition

An abiotic environmental factor which is present but not used or depleted by an organism. Common examples include temperature (soil and air), relative humidity, air flow, soil pH (which affects the resource of nutrients and their availability), soil mineral particles, soil salinity, or chemicals which might be present.

Conditions can be altered by other organisms to make these more conducive, improving their competitiveness to the detriment of other organisms. Each species will typically survive over a relatively wide range for a particular condition but will have a reduced range for each condition for active healthy growth, and usually an even narrower condition range for optimum reproduction to take place.