Aquaponics and hydroponics fertilisers

Q: Which chelated iron should I choose?

The one that holds at the pH of your water. DTPA 11 % works from pH 4 to 7.5 and does not colour the water; EDDHA 6 % stays stable up to pH 9 but tints the water red; EDTA 13 % can be used up to pH 6.5. Above 7.5, only EDDHA is suitable.

Q: What dose of chelated iron in aquaponics?

With DTPA 11 %, 18 g per 1,000 L every 2 to 3 weeks targets 2 ppm of iron; the target is 2 to 3 ppm, and deficiency symptoms appear below about 1.5 ppm. For a 500 L system, that means 9 g.

Q: Does the UV steriliser interfere with iron dosing?

With EDTA, yes: this chelate breaks down under UV light, and its product page advises switching off the steriliser for 6 to 12 hours after dosing.

Q: How can KH be raised while also supplying potassium?

With potassium bicarbonate: 36 g per cubic metre raises KH by one degree and supplies 14 mg/L of potassium. Do not exceed 1 to 2 degrees per day and leave 48 hours between doses; the pH does not rise above about 8.2.

Q: What conductivity should I aim for in hydroponics?

In full vegetative growth, the TriPart Grow product page gives 1.3 to 1.8 mS in hydroponics, and 1.1 to 1.6 mS in soil. A conductivity meter lets you track this value each time the reservoir is refilled.

Produits du rayon Engrais hydroponiques chez Univers Aquaponie

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Chelated iron

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EDDHA 6% chelated iron: dark red powder presented in a laboratory dish

Chelated iron (iron chelate) EDDHA 6%

From $8.00

Chelated iron DTPA 11%: ochre-yellow powder shown in a laboratory dish

Chelated iron (iron chelate) DTPA 11%

From $10.00

-50% on a selection of fish food

Yellow microgranulated chelated iron EDTA powder spread in a glass dish, on a white background

Chelated Iron EDTA 13%

From $9.00

White bottle of liquid EDDHSA chelated iron next to a beaker of deep red solution

Liquid chelated iron EDDHSA 6%

From $12.00

A small heap of potassium bicarbonate, a fine white powder, set against a white background

Potassium bicarbonate powder for aquaponics

From $22.00

Epsom salt magnesium sulphate – magnesium source for plants in aquaponics and hydroponics

Epsom salt, soluble magnesium sulphate

From $5.00

Patentkali potassium and magnesium sulphate – natural mineral fertilizer for aquaponics and soilless growing

Patentkali fertiliser granules, potash, magnesia and sulphur

From $8.00

Soluble potassium sulphate

From $8.00

1 L pot of Silicate in powder form, clay-based mineral amendment

Powdered silicate for plants, mineral amendment

From $19.00

Bottle of Aquaponic Mix fertiliser from Terra Aquatica, white cap and green label illustrated with fish

Organic fertiliser for aquaponics Aquaponic Mix, NPK 0-0-4

From $13.00

500 ml bottle of Aquaponic Mix, pH test bottle and its reading test tube, on a white background

Aquaponics fertiliser pack and pH test

$19.00

-35%

TriPart Starter Kit: 3 x 500 ml Terra Aquatica hydroponics fertiliser

Three-part hydroponics fertiliser kit, for soft or hard water

From $26.00

~~$40.00~~ From $26.00

1 kg sachet of DryPart Bloom, mineral bloom fertiliser in powder form NPK 6-17-15, front view

Mineral flowering fertiliser in powder form, NPK 6-17-15

$48.00

Mineral growth fertiliser in powder form, NPK 12-6-16

From $48.00

1 L bottle of NovaMax Bloom, one-part flowering fertiliser NPK 4-8-7, purple label

Liquid bloom fertiliser in a single bottle, NPK 4-8-7

From $15.00

15 products out of 73

Fertiliser is not chosen the same way in aquaponics and in hydroponics. In aquaponics, the fish supply nitrogen and phosphorus; what remains is to top up what their feed provides little of, such as potassium, calcium and iron. That is the principle behind Aquaponic Mix, NPK 0-0-4, dosed at 0.5 ml per 10 L every day. Choose chelated iron according to the pH of the water: DTPA 11 % works from pH 4 to 7.5 without colouring the water, EDDHA 6 % holds up to pH 9 but tints the water red, and EDTA 13 % does not go beyond pH 6.5. DTPA is dosed at 18 g per 1,000 L to target 2 ppm of iron.

In hydroponics, the solution supplies everything. Two- or three-part nutrients, such as the TriPart range, separate growth, bloom and trace elements; in full vegetative growth, TriPart Grow is dosed at 1.8 ml per litre, with a pH of 5.5 to 6.5 in the reservoir. Formulas for coco coir, organic biostimulants and starter kits complete the range. To recognise a deficiency, the article Plant deficiencies in aquaponics describes the symptoms.

Frequently asked questions

Which chelated iron should I choose?

What dose of chelated iron in aquaponics?

Does the UV steriliser interfere with iron dosing?

How can KH be raised while also supplying potassium?

What conductivity should I aim for in hydroponics?

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