Soilless cultivation of commonly used substitly - sand
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Last Update: 2021-03-15
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Source: Internet
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Author: User
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countries in the Middle East and the United States and other places, sand is used as soilless cultivation of the substitique, the advantages of which are cheap, a wide range of sources, cultivation effect is also very good. However, due to the heavy weight, it is more labor-difficult to move and replace the substitum.
(1) The chemical and chemical properties of sand. Weight 1.49g/cm 3 , total porosity
30.5%, large pores 29.5%, small pores 1.0%, water-to-air ratio (with large pore value of 1) 1:0.03, pH 6.5.
(2) The ideal sand size composition. Diameter > 4.7mm for 1%, diameter at 2.4 to 4.7mm for 10%, 1.2 to 2.4mm for 26%, 0.6 to 1.2mm for 20%, 0.3 to 0.6mm accounted for 25%, 0.1 to 0.3mm for 15%, 0.07 to 0.1mm for 2%, <0.07mm for 1%.
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