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Information on soil-free cultivation Soil-free cultivation is a new science and technology developed on the basis of plant mineral nutrition research.It does not use natural soil to cultivate plants completely with chemical solution (nutrient solution.Human exploration of mineral nutrition in plants,It can be traced back to the era of 600 BC,However, it is more recognized at present,The earliest scientific report on the study of plant mineral nutrition was the famous Willow experiment published in Belgion Jan Van Helmant in 1600.In the mid-19th century (1842) Wiegmen and Polsloff successfully cultivated plants with heavy distilled water and salts for the first time,It is also proved that dissolved salts in water are essential substances for plant growth.But the most prominent representative of this period,It should be considered Van Liebig (1803-1873 ),He proved that the carbon in the plant comes from CO2 in the air,H and O come from
Central air conditioning filter function, how to choose the central air conditioning filter? Under normal circumstances,At the last level, the air filter of the central air conditioner determines the degree of air purification,The upstream filters at all levels only play a protective role,It protects the lower wind end filter to extend its service life,Or protect the air conditioning system to ensure it works properly.Air conditioning design,The efficiency of the final central air-conditioning air filter should be first determined according to the user's cleaning requirements,Then,Select the filter that plays a protective role,If this filter is also protected,Then add a filter on its upper end.The filters that play a protective role are collectively referred to as 'pre-filters '.The efficiency of central air-conditioning air filters at all levels should be properly matched.If the efficiency specification of the adjacent two-stage filter is too different,Then the previous level does not play the role of
