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土壤中的植物营养通过三个主要机制到达正在生长的根表面:根向养料之处生长;由于根系吸收水分结果,养料通过水分流动时的质流(mass-flow)带到根部;如果上述两个过程不能满足植物需要,则养料可从土壤扩散到根部。根表面的养料吸收使根表面土壤中的养料浓度降低,从而创造了养料扩散的梯度。植物根生长接触的养料数量当植物根群生长通过土壤时所能直按接触的养料的最大数量,是等于根群体积的一土壤体积的数量。土壤中根群的体积据Dittmer研究:大豆、燕麦和黑麦的根群占0—6吋土层体积的0.91％,0.55％和0.85％。Abbas和Barber会计算10株生长在3升的温室盆缽中的大豆根群体积,在生长26天后占有土壤
Plant nutrition in the soil reaches the surface of the growing root by three major mechanisms: the root grows at the point of nourishment; as the root absorbs moisture, the nourishment takes its mass-flow to the root by the flow of moisture; if the above two A process can not meet the needs of plants, nutrients can spread from the soil to the roots. Nutrient uptake at the root surface reduces the concentration of nutrients in the root surface soil, creating a gradient of nutrients diffusion. The number of nutrients that plant root growth contacts The maximum number of nutrients that the plant root can touch as it grows through the soil is the number of soil volumes equal to the root population. According to Dittmer: The root mass of soya, oats and rye accounts for 0.91%, 0.55% and 0.85% of the 0-6 "soil volume. Abbas and Barber calculated the volume of 10 soybean soya grown in 3-liter greenhouse pots that occupied soil after 26 days of growth