Leafy Vegetables – TDS Ranges
Use these typical TDS ranges as a weekly reference for lettuce, spinach, herbs, and other leafy crops in recirculating systems.
| Week | Growth stage | TDS range (PPM) |
|---|---|---|
| Week 1 | Seedling | 300 – 400 |
| Week 2 | Early vegetative | 400 – 500 |
| Week 3 | Late vegetative | 500 – 600 |
| Week 4 | Harvest stage | 600 – 700 |
- Check water level: Ensure the reservoir keeps the pump fully submerged at all times.
- Top up nutrients: Add nutrient solution gradually until the TDS returns to the target range.
- Record readings: Log weekly TDS and pH so you can spot trends early.
