Why do roots need oxygen?

Air is needed for the roots primarily to allow the plants to breathe. ... When this happens, roots cannot absorb sufficient water and nutrients to the plant, causing yellow or brown leaves, plant stress and a reduced life span of the plant. Roots are denied sufficient air when the soil does not allow for air.

What happens when roots don't get oxygen?

If plant roots don't get enough oxygen, they become less permeable, take in less water, and can no longer absorb nutrients properly. ... Roots begin to die, and plant growth is stunted. Ultimately, pathogens can take over and cause plant death.