This is not a scam concept. Soilless culture is a crop cultivation technique that is not based on natural soil. Whether to cultivate crops directly in the nutrient solution of a device, or to cultivate crops in a solid substrate and supplement nutrients through a nutrient solution. Because no soil is used, it is called soilless culture. According to the external environmental conditions necessary for crop growth and development, especially the living conditions necessary for root growth, it designs cultivation devices and cultivation methods that meet these conditions, replaces natural soil with inactive solid matrix and nutrient solution, and provides temperature, moisture, oxygen and nutrients for crops, so that crops can grow normally and complete their whole life cycle. Advantages and disadvantages of soilless culture soilless culture is the most advanced cultivation technology in modern agriculture, and it can be monitored and regulated according to the needs of crop growth and development from cultivation facilities to environmental control. Therefore, soilless culture has incomparable advantages over traditional soil culture. Soilless culture can achieve early maturity and high yield of crops. For example, tomatoes cultivated in soilless culture can ripen 7 ~ 10 days in advance, and the yield can be increased by 0.5 ~ 1.0 times. The average American acre is 9000 ~ 10000 kg of tomatoes, 9000 ~ 15000 kg of cucumbers and 2000 ~ 3000 kg of lettuce. The tomato yield per mu is 26 tons/year in Britain, 26 ~ 30 tons/year in Holland and 2 1 ~ 25 tons/year in Japan. Soilless culture can produce clean, hygienic and pollution-free products. Because soilless culture does not use farm fertilizers such as human feces and manure. Moreover, there are relatively few pests and diseases, and pesticides are not used in large quantities, and herbicides are not sprayed. Its products reduce the pollution of fertilizers, parasites, pesticides and germs, and are clean, hygienic and pollution-free. Soilless culture can avoid pollution. Vegetable production in urban suburbs and industrial and mining areas is polluted by waste water, waste gas, waste residue and urban garbage, and its quality is declining, which hinders people's health. Using soilless culture technology to produce vegetables can avoid the above pollution. The advantage of soilless culture is labor-saving Soilless culture does not require soil tillage, soil preparation, fertilization, intertillage weeding, no herbicide spraying, little or no pesticide application, etc. Moreover, the field management work is greatly reduced, and the nutrient solution supply is mechanized or automatically controlled, which greatly improves the working conditions, saves labor by more than 50%, and has low labor intensity. Soilless culture can save water and fertilizer. Because soilless culture is under artificial control, through the scientific management of nutrient solution, the supply of water and nutrients is guaranteed, and the leakage, loss, volatilization and transpiration of water and fertilizer in traditional soil cultivation are greatly reduced. Therefore, soilless culture is a good agricultural "water-saving project", which saves water and fertilizer by 50 ~ 70% compared with traditional soil culture. Soilless culture can avoid the obstacle of soil continuous cropping. In protected cultivation, due to the limitation of facilities, frequent continuous cropping of soil leads to serious soil-borne diseases and insect pests, continuous accumulation of soil salt, soil acidification, soil salinization, soil hardening and other continuous cropping obstacles, which have become important factors affecting the production and development of protected areas. Large-scale use of steam to disinfect soil consumes a lot of energy and increases production costs. Soilless culture can avoid the above obstacles of soil continuous cropping, so soilless culture is an effective way to solve the obstacles of soil continuous cropping in protected facilities. Soilless culture can make full use of space. Lettuce, strawberry, radish, Chinese cabbage, Chinese kale, Chinese cabbage, and sprouts are cultivated in a multi-level and efficient manner, which improves the land utilization rate. Soilless culture can make full use of land. Because soilless culture is not limited by region and horizon, it can be applied to roofs, balconies, roofs, corridors and walls. With the development of urban construction, there are more and more garden lovers on the courtyard balcony. Soilless cultivation of flowers, vegetables and bonsai ornamental plants on roofs, balconies, roofs, corridors and even walls can not only increase income, but also beautify the environment, cultivate sentiment and increase the fun of life. In addition, because soilless culture is not limited by soil, it can also be used in places where soil culture is impossible, such as deserts, oil fields, beaches, saline-alkali land, barren hills, islands and places with serious soil pollution. It is of special significance to solve the vegetable supply of people in these areas. Soilless culture is beneficial to the modernization of vegetable cultivation. Soilless culture simplifies the cultivation procedure, facilitates the cultivation facilities and operation management, and develops towards automation and modernization. Disadvantages: the initial one-time investment is large. No matter which method is used for soilless culture, it needs cultivation facilities, fertilizers, water and other materials, which is a considerable investment compared with soil culture. At present, although China is committed to the development of simple soilless culture facilities, an acre of land still needs about 6,543,800 yuan. The management of soilless culture requires a certain level of knowledge. Because soilless culture is a brand-new science, its cultivation technology is completely different from soil culture, especially the technology of preparing nutrient solution and preventing disease infection, which needs a certain degree of education to master, which is undoubtedly a limiting factor to popularize soilless culture technology. Soilless culture is greatly influenced by external factors. Compared with soil cultivation, soilless cultivation crops are easily affected by external factors such as temperature, oxygen, carbon dioxide and mineral nutrients because they grow in nutrient solution. It is precisely because of the advantages and disadvantages of soilless culture technology that people concerned have different opinions on this technology for decades. However, due to the unremitting efforts of soilless culture workers and the advantages outweigh the disadvantages, soilless culture technology has become one of the main research directions of vegetable cultivation technology in the world today, and its development prospect is very broad.