Vermiculite is a material that can hold air , water and nutrients .

蛭石是一种可以保持空气、水分和营养成分的物质。

Drop several seeds over the surface of the pot and cover with a thin layer of vermiculite .

在花盆的土壤表面撒下数颗种子，并覆盖一层薄薄的蛭石。

Study on mineralogy and expansiveness of vermiculite in tuanfeng .

团风蛭石的矿物学和膨胀性能的研究。

Studies on vegetables in soilless culture the effect of sand and vermiculite on growth of curled lettuce and edible amaranth .

蔬菜无土栽培之研究砂与（石至）石对绉叶莴苣、苋菜生长之影响。