Soilless cultivation

Soilless cultivation refers to the cultivation method in which water, grass charcoal or forest soil, zircon and other media are used as the substation fixation plants of the root system, and the plant roots can come into direct contact with the nutrient solution. The nutrient content in soilless cultivation is easy to control and can be adjusted at any time. In places with light, temperature and no soil, such as deserts, beaches and desert islands, it can be carried out with a certain amount of fresh water supply. Soilless cultivation is divided into hydroponic, fog (gas) cultivation and substitlytic cultivation according to the different cultivation medium. Hydroponics refers to the cultivation method of plant root system which is in direct contact with the nutrient liquid and does not use the substitut. The earliest hydroponics was the immersion of plant roots in nutrients to grow, which led to hypoxia and, in severe cases, root death. Hydroponic methods are often used by the nutrient film method, even if a very thin layer of nutrients, constantly circulating through the root system of the crop, not only to ensure the continuous supply of crop water and nutrients, but also to continuously supply the root system of fresh oxygen

1, hydroponics: hydroponics refers to the cultivation method that does not use the substation to fix the root system, so that the plant root system comes into direct contact with the nutrient liquid. Mainly include deep flow hydroponics (deep flow technique, DFT), nutrient membrane cultivation (nutrient film, NFT) and floating capillary hydroponics, FCH).
1) Deep liquid flow cultivation technology: the nutrient liquid layer is deep, the root system stretches in the deeper liquid layer, each plant occupies more liquid, so the concentration of nutrient liquid, dissolved oxygen, acidity and alkalinity, temperature and moisture stock are not easy to change sharply, providing a more stable growth environment for the root system.
2) Nutritional liquid membrane technology: is a method of hydroponics that plants in shallow flowing nutrients. The technology can solve the problem of oxygen demand in the root system because the liquid layer is shallow, the root system of the crop is partially immersed in the shallow flow of nutrients, and the other part is exposed to the moisture in the planting tank, but due to the low amount of liquid, it is susceptible to the influence of the ambient temperature, which requires fine management.
3) Floating tube cultivation technology: the use of cultivation bed with floating plate wet felt rooting technology, in order to cultivate moisture root to create an oxygen-rich environment, to solve the water gas contradictions;

2, fog (aeroponics): fogpei also known as aerosol or aerosol, is the use of filtered nutrients under pressure through the atomization spray device, the nutrient liquid atomized into small droplets, directly sprayed to plant roots to provide plant growth needs of water and nutrients of a soilless cultivation technology. Aerosol cultivation is the best form of solving the water-gas contradiction of rootless cultivation technology, which can multiply crop yield, and also make it easy to automatically control and carry out three-dimensional cultivation, and improve the utilization rate of greenhouse space. However, the requirements of the device are very high, greatly limiting its popularization and utilization.

(ii) Substring cultivation
The hoshan stone moustite cultivated by the substite
The hoshan stone moustite cultivated by the substite
The characteristic of substation culture is that the roots of cultivated crops have a fixed base. It is fixed to the root of the crop in an organic or inorganic substation, organic substation has peat, rice shell, bark, etc. , inorganic such as zircon, pearl rock, rock wool, pottery, gravel, sponge soil, etc. can be used as a supporting medium, through drip irrigation or fine-flow irrigation methods, to supply crop nutrients. Substrate cultivation in most cases, water, fertilizer, gas coordination, adequate supply, low investment in equipment, easy to take material in place, good and stable production performance;