Biology: Vegetables are grown on the top of the greenhouse and mushrooms are grown on the bottom.

First of all, you need to understand photosynthesis: that is, light energy synthesis. Plants, algae and certain bacteria use photosynthetic pigments to convert carbon dioxide (or hydrogen sulfide) and water under the irradiation of visible light. A biochemical process that is organic matter and releases oxygen (or hydrogen). Photosynthesis is the sum of a series of complex metabolic reactions. It is the basis for the survival of the biological world and an important medium for the earth's carbon and oxygen cycle.

Secondly, mushrooms are a relatively low-grade plant belonging to the fungus class. They do not bloom or produce seeds, but can only produce spores for reproduction. When the spores fall into the soil, they produce mycelium, which relies on vegetative mycelium to absorb nutrients and water, and then produces fruiting bodies, which are the mushrooms we see. But the fruiting body is very small at first and difficult to detect. After absorbing enough water, it will stretch out in a short time. Mushrooms have no chlorophyll and cannot produce their own nutrients. They can only use their mycelium to extend into the soil or rotting wood to absorb readily available nutrients to sustain life. Therefore, mushrooms often grow in warm, humid and organic places.

So, when planting three-dimensional mushrooms and vegetables in a greenhouse, the mushrooms respire to produce carbon dioxide, so the concentration of carbon dioxide in the greenhouse will be higher than outside, plus sufficient oxygen (no matter how well-sealed the greenhouse is, the oxygen (also sufficient) and light time, vegetables can carry out sufficient photosynthesis, promote growth, and thus increase yield.