How much oxygen does lettuce need?

Lettuce, like other plants, requires oxygen primarily for respiration, which occurs mostly at night when photosynthesis is not taking place. The amount of oxygen needed varies with the plant's size, age, and growth conditions, but it generally requires a small amount compared to its carbon dioxide intake during photosynthesis. Adequate soil aeration is essential for root respiration, allowing lettuce to absorb the oxygen it needs to thrive.