New here? Take the guided fertigation tour: a clickable walkthrough of every control on this page, using a worked tomato recipe. No account needed, nothing is saved. Built by an actual grower.
No fertilizers yet. Add them on My Fertilizers and they'll show up in the dropdowns here.
How to use this
Pick a fertilizer for each row.
Set its Base element to the one nutrient you want to dial in to a number, usually N, P, or K. Then enter that Target ppm. The product's other nutrients come with it in their fixed ratio.
Check the Resulting Profile and Mixing Guide below for your totals and exactly how much to add.
Example: choose Calcium Nitrate, set the base element to N at 150 ppm. Its calcium comes along in ratio, so you don't dose it separately.
Example: choose Magnesium Sulfate, set the base element to Mg at 50 ppm. Its sulfur comes along in ratio, so you don't dose it separately.
Mixed in their own sprayer, not the feed, so they don't count in the feed totals. Spray ppm is the strength of the spray itself.
pH Adjustment
pH adjustment (acid) (optional)
Resulting Profile
N · P · K vs Target
Other Nutrients
Nutrient Sources
Each bar is one nutrient's total, split by product. Tap a nutrient to see the ppm each product adds. Before changing a product, check what else it carries.
Concentrate Tanks
Batch Tank Fill
Mixing Guide
Share, print or save the full recipe report. Save downloads a PDF.
Paid plans
This demo is the free calculator. Home and Pro add:
Auto-adjust (Pro): sets every product's ppm in one step for the closest fit to your targets, and suggests products that would close a gap.
pH and acid dosing (Home and Pro): sizes the acid from your water test.
Injectors: a direct-feed or siphon injector with one fertilizer tank and an acid tank on Home; batch tanks and up to 6 tanks on Pro.
Saved products and recipes: 2 products and 1 recipe free, 3 each on Home, unlimited on Pro. Each recipe keeps its site's tanks, water and medium.