The soil is used independently of the sun, the nutrient solution circulates, and the plastic foam board used to fix plants is lifted. It turns out that the roots of plants don't grow in soil at all, but are completely immersed in nutrient solution. The role of soil is to provide nutrients and water. Nutrient solution not only provides water, but also provides various elements needed for plant growth, including nitrogen, phosphorus, potassium and other major elements and trace elements such as zinc, iron and manganese. Therefore, it is not necessary to use soil for culture. Now the technology of soilless culture is very mature, and the growth cycle of hydroponics is much faster than that of soil culture, which is also an important reason for using hydroponics.

The monitor on the wall has the data of nutrient solution monitoring, which is the parameter to control the temperature of nutrient solution. In cold weather, the system will heat the nutrient solution, and if the temperature is very low, it will cause damage to the roots of plants. There is no window in the hut of the plant factory, so the light outside can hardly get in. Everyone knows that everything grows on the sun, but the plants in the factory can't see the sun. Don't they grow by the sun?