Add plant_assoc terms to soil & sediment packages

[mslarae13]

Current term details Please supply the current details of the term that you would like to update:

Term name - "air temperature regimen", "biotic regimen", "chemical administration", "gaseous environment", "growth facility", "watering regimen", "climate environment", "humidity regimen"
Term ID - "air_temp_regm", "biotic_regm", "chem_administration", "gaseous_environment", "growth_facil", "watering_regm"
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Suggested update(s) Please supply the new suggestions for any of the details listed below (only insert text to those details that should be updated):

Term name - 
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Additional context Add any other context about the update request here, e.g. why you think this needs to be updated.

--Include these terms with MIxS 6 for soil and sediment packages. All of these treatments can be applied to soil samples in lab incubations and within large scale field experiments (Example: SPRUCE run by ORNL)