第二讲　基质及营养液与栽培方式 基质的种类很多，有泥炭、岩棉、蛭石、珍珠岩、锯末、砂、各种泡沫塑料等，种植者可以选择适合自己要求的基质，但要对其物理化学特性有所了解。 一、基质的化学特性 无土栽培基质的化学性质主要包括：形成基质的植物分解程度；ｐＨ值；电导度 Lecture 2: Substrates, Nutrient Liquids and Cultivation Methods There are many types of matrices, such as peat, rock wool, vermiculite, perlite, sawdust, sand, and various types of foam. Growers can choose the suitable matrix for their needs, Its physical and chemical properties have some understanding. First, the chemical properties of the substrate The chemical properties of soilless culture substrate include: the formation of matrix plant decomposition degree; pH; electrical conductivity