营养液膜技术 (NFT) 是一种水培方法，其中一层薄而连续的营养液沿着倾斜通道的底部流过裸露的植物根部。上部的根留在潮湿的空气中以获取氧气，而下部的根则从流动的薄膜中吸收水分和矿物质。
关键事实
- Shallow film of nutrient solution (2–3 mm deep) flows continuously through sloped channels
- Upper roots access atmospheric oxygen; lower roots absorb nutrients from the film
- Highly water-efficient — solution recirculates in a closed loop
- Best suited to fast-growing leafy crops and herbs
- Requires a reliable pump — power outages quickly stress roots
- Channel gradient of 1:30–1:40 (2–3 cm drop per metre) is critical for even flow