- Analyze raw water and adjust nutrient solution accordingly
- Suitability of raw water centers on EC, sodium, and chloride levels
- Analyze raw water several times throughout the growing season
- Confirm accuracy of nutrient solution
- Optimum slab EC for cucumbers is 2.1 - 2.5 and for tomatoes is 2.5 - 3.5. This may need to be raised or lowered depending on environmental conditions or stage of crop development
- Optimum ratios of potassium to nitrogen for cucumbers is 1:5:1 and for tomatoes is 2:1 to 3:1
- Optimum ratios of potassium to calcium is 1:1 to 2:1
- Optimum slab pH is 5.5 - 6.0
