From Seed to Seed:
Plant Science for K-8 Educators

Digging Deeper

Root Respiration

If plant roots need air, then what about plants grown hydroponically? Hydroponics is the practice of growing plants without soil. There are many different ways to set up a hydroponic garden, but all rely on water, rather than soil, to deliver plant nutrients. Many people think of hydroponics as growing plants directly in a tub of water. However, instead of being constantly submerged, plant roots are bathed in a nutrient solution at regular intervals. Some hydroponic gardens are designed so that the roots grow on a spongelike material. Periodically, a nutrient solution washes over the sponges. The damp sponges can absorb some of the water solution and still contain plenty of air spaces.

Please click the BACK button on your browser to return to the course.