沙砾培就是用沙和小石砾的混合物作为基质来栽培植物的一种方法。沙砾和水一样,都不含有植物生长所必需的全部营养元素。但是沙砾是一种散碎的固体,既能起到支撑植物直立的作用,又能起到通气使植物根部能进行正常呼吸的作用。这是沙砾培优于水培的主要之点,并使无土栽培技术得到简化。因此,当今世界各国广为应用。 Gravel cultivation is a method of growing plants by using a mixture of sand and small gravel as a substrate. Grit, like water, does not contain all the nutrients necessary for plant growth. However, gravel is a scattered solid, which can not only support the plant upright but also ventilate the plant roots for normal respiration. This is the main point where gravel is better than hydroponics and simplifies soilless cultivation techniques. Therefore, various countries in the world are widely used today.