Front Row Ag · Feed Calculator
Stock concentrate mixing rates & feed schedules
Stock Concentrate is the standard commercial setup. Fertilizer is pre-mixed into concentrated stock tanks, then injected into the irrigation line by dosing equipment (injectors). The calculator shows how much product to add to each stock tank and the injection rates for your dosers.
Direct to Reservoir is for facilities that mix nutrients directly into a reservoir or batch tank at working strength — no stock tanks or injectors involved. The calculator shows how much product to add per gallon (or per liter) of final solution.
3:2:2 is the standard mixing method. Three 25-pound bags of Part A go into a 50-gallon stock tank (75 lbs total at 1.5 lbs/gal). Part B and Bloom each get two 25-pound bags into 50 gallons (50 lbs each at 1 lb/gal). Because Part A is more concentrated, the injection rates come out equal across all three parts — which simplifies day-to-day dosing.
1:1:1 means everything is mixed at 1 pound per gallon — 50 pounds of each part into 50-gallon stock tanks. This is a lower concentration than 3:2:2 and is used by facilities that prefer a uniform weight ratio. Injection rates will differ between parts since each contributes a different share of the total EC.
3-Doser: Three separate stock tanks — Part A, Part B, and Bloom each get their own injector. This is the standard setup and allows full flexibility with per-phase recipe adjustments.
2-Doser: Two stock tanks — Part A in one, and Part B + Bloom combined in the other. Used in facilities with only two injectors. A combined tank fixes the Part B–to–Bloom ratio, so all flower phases run the Swell recipe, and the tank is mixed at that ratio rather than 1:1. Tank 1 is the same Part A tank as the standard 3-2-2 build. The two tanks run at different injection rates — set each doser to the rate shown in its own row, then confirm with EC/PPM validation.
Applied to both stock tanks. The 50 gal default fits a standard 55-gallon barrel. Tank 2 is the more dilute tank and runs at a higher injection rate, so it empties roughly 1.7x faster than Tank 1 — size up or plan refills accordingly.
Commercial (Stack → Swell) — the default chart — is the simplified production program: Veg / Moms on Veg, the Stack recipe through early flower (Wk 1–2), then Swell for the remainder, finishing on Ripen. The Swell phase steps down through mid-flower: weeks 3–5 run at the higher Swell EC (2.7 High / 2.2 Standard), weeks 6–8/9 at the lower Swell EC (2.4 High / 2.0 Standard), before Ripen. Custom EC values override this.
Standard Progression uses the full Veg → Stretch → Stack → Swell → Ripen recipe sequence — the "craft" chart for single-variety rooms that taper recipes across the cycle.
Swell Through Flower keeps Veg / Moms on the Veg recipe, then runs the Swell recipe for the entire flower cycle — the simplest single-recipe flower program. As modern growing methods (high-intensity LED, under-canopy lighting, precision irrigation) have raised average feed EC, Swell delivers more favorable outcomes at those higher EC levels. Target EC still follows the selected EC preset or your custom EC values.
Custom appears when individual recipe dropdowns in the feed schedule have been changed manually.
2-Doser mode locks every phase to the Swell recipe — the combined tank is weighed to Swell's Part B–to–Bloom ratio and can't be re-split per phase — so the recipe schedule options are hidden.
PhosZyme is added to its carrier stock tank at 10% of the carrier's weight — 5 lb per 50-lb tank — which keeps the applied dose at or near the 0.4 g/gal target across the chart. The carrier is Part B (or the combined B + Bloom tank in 2-doser mode). PhosZyme is not calcium-compatible, so it never goes in a tank with Part A. It contains phosphorus-digesting enzymes that improve nutrient availability. When enabled, the calculator automatically scales all dosages down slightly so the total EC — including PhosZyme's contribution — still hits your target. Toggle it on if your feed program includes PhosZyme.
Si is a silica supplement used as a foliar spray at 0.5–2 mL/gal, once weekly, from veg through week 3 of flower.
pH Up is used as needed to raise pH into the 5.5–6.0 target range. Maximum 0.2 g/gal total in the mix. Always add last, after all nutrients are mixed, and allow 5–15 minutes of reaction time before re-measuring.
BioFlo is a bioenzymatic line cleaner that removes biofilm from irrigation lines, maintaining consistent flow and even nutrient delivery. Not a feed additive — used as a periodic soak between or during cycles.
Triologic is a microbial inoculant containing Mycorrhization Helper Bacteria. It amplifies mycorrhizal colonization when applied as a weekly hand-water drench alongside a separate mycorrhizal inoculant.
Feed Schedule
| Phase | Veg / Moms | Wk 1–2 | Wk 3–5 | Wk 6–8/9 | Final 1–2 Wks |
|---|---|---|---|---|---|
| Recipe | |||||
| Target EC |
Veg / Moms is not served in 2-doser: a combined B + Bloom tank can't deliver a zero-Bloom Veg recipe. Run veg / moms on a separate Part A + Part B feed.
The two tanks run at different injection rates — set each doser to the rate shown in its own row above. Tank 2 is the more dilute tank and runs faster. Confirm with EC/PPM validation.
Tip: Choose "Save as PDF" in the print dialog to download a clean one-page PDF.
Supplemental Products
▾Stock Concentrate Rates
| Validation | |||||||
|---|---|---|---|---|---|---|---|
| Tank | Part | gal | lbs | lbs/gal | mL / 5gal | EC/g/gal | Valid. EC |
* When mixed with Part B stock solution, PhosZyme will increase the validation EC.