Pepper hydroponic nutrients: ppm, EC & pH by stage
Pepper wants roughly 170 ppm nitrogen and an EC around 1.8–2.4 mS/cm in veg — here's the full per-stage target table (N, P, K, calcium, magnesium, EC and pH) you dose your reservoir to.
Pepper nutrient schedule (ppm, EC, pH by stage)
| Stage | N | P | K | Ca | Mg | S | Fe | EC | pH |
|---|---|---|---|---|---|---|---|---|---|
| Vegetative | 170 | 50 | 220 | 170 | 50 | – | – | 1.8–2.4 | 5.8–6.2 |
ppm by element; EC in mS/cm. – = general line rate.
Stage by stage
Vegetative: Bell, jalapeño, and chili targets converge during vegetative growth; fruit-set Ca demand rises sharply.
Hitting these numbers
Dose any complete hydroponic fertilizer to the EC above, then check that your N and calcium land near these ppm — pepper is most sensitive to those. Adjust pH into the listed band after mixing, since nutrient uptake falls off outside it. Reservoir EC creeps up as plants drink water faster than nutrients; top up with plain pH-adjusted water and re-check.
FAQ
What EC and ppm does hydroponic pepper need?
In vegetative growth, pepper targets about 170 ppm nitrogen at an EC of 1.8–2.4 mS/cm, with the full N/P/K/Ca/Mg spread and pH shown in the table. Seedlings run lighter; fruiting stages (where relevant) shift toward more potassium.
What pH for hydroponic pepper?
Keep the reservoir in the pH band listed per stage (typically 5.5–6.2 for pepper); outside it, iron and phosphorus uptake drop off even when the ppm are correct.
Can I use one nutrient mix for pepper all the way through?
You can, but you'll get better results shifting the ratio and EC by stage as the table shows — lighter and lower-EC for seedlings, fuller in veg, and more potassium if it fruits.
Nutrients to hit these numbers
Any complete hydroponic line hits these targets — you just dose to the EC and adjust for your crop stage.
- A 3-part line like General Hydroponics Flora trio lets you shift the N-P-K ratio between veg and fruiting.
- MasterBlend 4-18-38 + calcium nitrate + Epsom salt is the cheap DIY route that hits the same ppm.
- You can't dose by eye — a calibrated EC/ppm + pH meter is what turns these targets into a real reservoir.
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Sources
Targets are typical published values; your water's starting EC and alkalinity shift the final dose. Targets per Cornell CEA pepper broad guidance.