Staying aerobic isn't just for the gym – oxygen is the most important element of root health for your plants. When plant leaves photosynthesize, they create energy (sugars) from light, water and CO2. It's like an equation where Light + H2O + CO2 = Sugars. During the reaction, the leaves absorb CO2, but the “O” in H2O (the oxygen) gets broken off and is released by the plants as atmospheric oxygen. It's a neat trick for plants to make food out of sunlight. It's even neater when you consider that the oxygen by-product is what allows us to live here on earth. But what about the poor roots? Root cells need to have energy to grow big and strong, too, but they can't photosynthesize underground. In order to support root growth, the plant takes sugars built in the leaves and transports them to the root cells. In order to use that sugar for cellular respiration however, the roots need to consume oxygen. Basically, the reaction happens in reverse and Sugars + Oxygen = CO2, Water and Energy (for root growth). The bottom line is that oxygen to the roots is as crucial to overall plant health as CO2 is to the leaves.
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