Masterblend 4-18-38 Tomato Formula Hydroponic Calculator   v1.2

This calculator is primarily based on academic studies.

Data gathered from: Aero-Gro — Recommended EC and pH for Hydroponic Vegetables, Herbs, and Cannabis Aqua Gardening — Complete EC & pH Levels Chart for Hydroponic Plants Bloomingreen — pH and EC Levels for Hydroponic Vegetables: 101 Ultimate Guide CEAC, University of Arizona — Chapter 10: Fertigation Systems and Nutrient Solutions Complete Grow — Hydroponic Nutrients for Herbs (Basil, Mint, Parsley, Oregano, Thyme, Rosemary, Sage) Cornell University — A Recipe for Hydroponic Success (Mattson, hydroponic-recipes.pdf) Dr Green Thumbs — Hydroponic Strawberry Nutrients Guide 2025 EarthOne — How to Grow Centella asiatica (Gotu Kola) Farmtek Australia — NPK Fertilizers for Strawberries by Growth Stage Garden Vivid — 8 Essential Nutrients for Thriving Hydroponic Strawberries Green Ridge Hydroponics — Electrical Conductivity & pH Values for Hydroponic Vegetables Hasselt University / SCK CEN (Van Dyck et al.) — Effects of Environmental Parameters on Lemna minor Growth HydroBuddy (danielfppps) — Open Source Hydroponic Nutrient Solution Calculator HydroHowTo — List of pH & EC Levels for 65+ Hydroponic Vegetables & Herbs Hydroponic Advice — Hydroponic Strawberries Guide Hyjo — pH, EC & PPM Guide for Hydroponics: Essential Nutrient Management IntechOpen — Nutrients for Hydroponic Systems in Fruit Crops Iowa State University (Kramer, Currey & Boldt) — pH Optima: Determining the Optimal pH for Hydroponic Herb Production (via Produce Grower) ISHS — Effect of Different Nutrient Solution EC During Growth Stages on Fruit and Vegetative Characteristics of Strawberry in Hydroponic System ISHS — Effects of Different Nutrient Solutions on Yield, Quality and Nutrient Consumption of Green Beans Journal of Plant Nutrition (Egilla, Lincoln University) — Yield and Leaf Elemental Concentration of Beetroot in Response to Nutrient Solution Composition in Hydroponic Culture Leaves and Soul — Best Fertilizer for Indoor Herbs LetPot — Hydroponic Herbs: A Beginner's Top 10 List MDPI Agronomy (Chrysargyris & Tzortzakis) — Nitrogen, Phosphorus, and Potassium Requirements to Improve Portulaca oleracea L. Growth in Hydroponics MDPI Agronomy — Selection of Fertilizer and Cultivar of Sweet Pepper and Eggplant for Hydroponic Production Missouri University Extension — Hydroponic Nutrient Solutions (G6984) Ohio State University Extension — Hydroponic Nutrient Solution for Optimized Greenhouse Tomato Production (HYG-1437, Jensen/UA-CEA recipe) Oklahoma State University Extension — Electrical Conductivity and pH Guide for Hydroponics (HLA-6722) PonicsLife — Hydroponic Charts for Fruits and Vegetables: pH, TDS, EC, cF, PPM Produce Grower — Edible Crop Species Differ in Their pH Effect in Hydroponics PubMed Central — Peer-reviewed hydroponic research (Purslane, Duckweed, Gotu Kola, Strawberry) PubMed Central — Substrate System Outperforms Water-Culture Systems for Hydroponic Strawberry Production QP Seedlings — Optimal NPK Ratios, Electrical Conductivity (EC) and pH Levels for Growing Vegetables QP Seedlings — Understanding Electrical Conductivity (EC) in Hydroponics Science in Hydroponics — Comparing Nutrient Solutions for Hydroponic Tomatoes: What the Research Says Self Sufficient Culture — pH and EC Reference for Hydroponic Plants and Herbs Shershegrows — Best pH and EC Values for Hydroponics (Chart) Shershegrows — Mastering Nutrients: A Simple Guide to pH and EC in Hydroponics The Greenery Retail — Suitable pH, TDS, and EC Levels for Specific Vegetables University of Arkansas (Ryan Dickson, Ph.D.) — Managing Nutrient Solutions for Hydroponic Crops Thanks: Saison05

All reasonable efforts have been made to ensure the accuracy of the information, however, Fred Thompson does not warrant the accuracy and reserves the right to change website content and site functions at any time without notice.