Study On Effects Of Components And Particle Sizes On Pore Properties Of Media

Media cultivation is a technique that does not use soil but media or uses media only during seedling, nutrition liquid replaces media after stable plant. Media cultivation is based upon cultivation media. With the development of modern agriculture and adjustment of horticulture crops and the progress and development of our facility horticulture, flowers and vegetables are high value-added agricultural production, which are trasforming to modernization, industrialization, scale and market, media cultivation has increasingly beening highlighted. For media cultivation, the media is main factors that decide plant root system environment. The stable and good root environment, such as moisture, oxygen, nourishment, temperature, pH, etc., lies on the physical and chemical properties of media, which include total porosity, water-filled porosity, air-filled porosity, ratio of water-filled porosity to air-filled porosity, particle size, water-holding capacity, pH, conductivity (EC), cation exchange capacity (CEC), bulk density, density, moisture content, etc.. Pore properties (pore space, particle size distribution) directly affect water and air content, which are the most important physical parameters. Porosity is too much to protect fertilizer and water; another side, porosity is too little then will decrease ventilated capacity of media. Either too big or too small porosity is not beneficial to the growth of plants, and different media mixed may get different porosity. Therefore, finding a scientific and rational particle size range and material mixed ratio are particularly important. So to the above context, the experimentation main is for the following studies: to take perlite and vermiculite as study object, research the relationship between bulk-density and particle size; the effect on languish modulus and water-holding capacity of media particle size; the relationship beween total porosity, air-filled porosity, water-filled porosity and particle size; impact of the mixed ratio to pore property of complex media that include peat, vermiculite and perlite; and the impact that the pore property of media to geranium cuttage outcome and maidenhair seedling. The results show:...