Soil

Soil is a mixture of organic and inorganic materials, air, and water located between planet's lithosphere and atmosphere that supports life.

Omicron Theta was a farm planet but its soil bacteria was taken by the Crystalline Entity, making it useless. 

When Doctor Julian Bashir arrived at the Bajoran village he received a medical emergency message from he scanned the air, the water, and the soil but was not able to find any pollutants.