Solar greenhouses are simple facilities that make full use of solar energy, generally do not heat vegetables for wintering cultivation in cold areas, and cultivation facilities that produce fresh vegetables. Solar greenhouses have distinctive Chinese characteristics and are unique to China. The structure of solar greenhouses is different everywhere, and there are many classification methods, according to wall materials, mainly dry base soil greenhouses, masonry greenhouses, composite greenhouses, etc. According to the length of the rear roof, there are long rear slope greenhouses and short back slope greenhouses; according to the front roof form are divided into two-fold, three-fold, arched, micro-arched, etc., according to the structure are divided into bamboo and wood structure, steel-wood structure, reinforced concrete structure, all-steel structure, all-reinforced concrete structure, suspension structure, hot-dip galvanized pipe assembly structure, skeleton material: ordinary steel pipe welding method, hot-dip plating Zinc steel pipe welded type, hot-dip galvanized steel pipe assembly type, “few” shape Steel pipe assembly type, flat tube assembly type, skeleton structure: column type, full steel frame type, covering material: double arch double film covering, single film covering, glass, PC board, insulation facilities: composite insulation quilt+composite insulation body+earthen wall+brickwork, specifications: 8m-16m, supporting equipment can be selected according to the needs of different supporting equipment according to the greenhouse function needs, the characteristics of solar greenhouses are Good insulation, investment, energy saving, very It is suitable for use in economically underdeveloped rural areas in China. 02 Soilless culture (soilless culture) is a method of cultivating plants using other things without soil, including hydroponics, fog (gas) cultivation, and substrate cultivation. In soilless cultivation, artificially formulated nutrient solutions are used to supply the nutritional needs of plants. Soilless cultivation is a type of nutrient that does not use natural soil and uses nutrients necessary for plant growth and development to provide a balanced ratio and moderate concentration of nutrients. Liquid, is the key to successful cultivation, the culture medium used in soilless cultivation can be recycled, the matched nutrient solution is selectively absorbed by plants, the concentration of some ions decreases faster than others, the ratio and PH value of each element change, gradually unsuitable for the needs of plants, so every once in a while, use NaOH or HCI to adjust the pH value of the nutrient solution, and supplement the elements that reduce the concentration more, Since the PH value and the concentration of certain ions can be continuously measured by selective electrodes, the amount of added acid, alkali or supplementary elements can be automatically controlled, but this recycling cannot continue indefinitely. When the solid inert medium is added to the culture medium, the nutrient solution should also be regularly discharged, or use the method of spot irrigation culture to supply enough oxygen to the plant roots. When the plant is steaming vigorously, the concentration of the culture medium increases, which is necessary Add some water. The key to successful soilless cultivation is to manage the nutrient solution used to meet the nutritional needs of the crop. The nutrient content in soilless cultivation is easy to control and can be adjusted at any time. It can be carried out in places where light, temperature is appropriate and there is no soil, such as deserts, beaches, deserted islands, as long as there is a certain amount of fresh water supply, and soilless cultivation methods can also be used in the suburbs and households of large cities to grow vegetables and flowers. The spacing between greenhouse greenhouses in strawberry picking gardens should generally take into account the operating space for replacing plastic film and the need for ventilation and drainage between greenhouses. When building plastic greenhouses in the southern region, gutters are often designed between the two plastic greenhouses, so the distance between them should be about 1m. For the northern regions where land resources are relatively rich, the spacing between large ones can be expanded to about 2 meters. The distance between the front and back of the solar greenhouses should be determined on the principle that the previous greenhouse does not affect the lighting of the rear greenhouse. The hill area can be built in a stepped manner to shorten the spacing of greenhouses and save land resources, but pay attention to the earthwork balance and determine the reasonable spacing of greenhouses according to the size of the slope; for plain areas, at least 10 a.m. during the planting season should be guaranteed to the front edge of the greenhouse, that is, greenhouses should ensure continuous and effective lighting of at least 4h when the light*** is weak, and generally should have 5 to 6 hours of effective lighting time. 02