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

Hydroponic nutrients

Organic fertilisers

Biostimulants

Chelated iron

Aquaponics supplements

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Produits du rayon Correcteurs de pH chez Univers Aquaponie

pH adjusters

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

Chelated iron (iron chelate) EDDHA 6%

From 900.00 RSD

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

Chelated iron (iron chelate) DTPA 11%

From 1,000.00 RSD

-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 900.00 RSD

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

Liquid chelated iron EDDHSA 6%

From 1,200.00 RSD

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

Potassium bicarbonate powder for aquaponics

From 2,300.00 RSD

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

Epsom salt, soluble magnesium sulphate

From 500.00 RSD

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

Patentkali fertiliser granules, potash, magnesia and sulphur

From 800.00 RSD

Soluble potassium sulphate

From 900.00 RSD

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

Powdered silicate for plants, mineral amendment

From 2,000.00 RSD

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 1,400.00 RSD

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

Aquaponics fertiliser pack and pH test

2,000.00 RSD

-36%

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

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

From 2,700.00 RSD

~~4,200.00 RSD~~ From 2,700.00 RSD

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

5,100.00 RSD

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

From 5,100.00 RSD

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 1,600.00 RSD

15 products out of 141

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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