Hydroponic Lettuce Nutrient Guide: EC, PPM & pH Ratios
Home > Hydroponics > Hydroponic Lettuce Nutrient Guide: EC, PPM & pH Ratios Last Reviewed: August 26, 2026 | Author: Faisal Habib | Fact-Checked: Lab and Field Verified | Expert Reviewer: Wara Danish, MSc Plant Biology Difficulty: Intermediate | Target EC: 1.2–1.8 mS/cm | Target PPM: 600–900 (500 scale) | Target pH: 5.6–6.0 | Water Temp: 65°F–68°F ⚡ Quick Answer: What is the Best Nutrient Formula for Hydroponic Lettuce? The ideal nutrient formula for hydroponic lettuce maintains an EC of 1.2 to 1.8 mS/cm (600–900 PPM), a pH of 5.6 to 6.0, and high nitrate-nitrogen with dissolved calcium above 140 ppm to ensure crisp heads without tipburn. 📊 Master Hydroponic…