珍珠岩是一种轻质多孔的火山玻璃，经过高温加热，膨胀成白色、类似爆米花的颗粒。在园艺中，它被用作种植介质或改良剂，以改善排水和通气。珍珠岩化学性质稳定，pH值中性，不会分解，因此适用于土壤混合物和水培系统。其多孔结构可保持少量水分，同时允许多余的水和空气在根部周围自由流动。
关键事实
- Made from expanded volcanic glass — lightweight, sterile, and pH neutral
- Excellent drainage and aeration properties; does not compact over time
- Common uses: mixed with coco coir (70:30 coco/perlite), soil amendment, standalone drip medium
- Holds approximately 20% water by volume while allowing oxygen access to roots
- Reusable after sterilisation between grows
- Fine perlite can be used in NFT channels; coarse perlite suits deep drip and Dutch bucket systems