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Growth Technology Blackjak 1L (Humic Acid & Fulvic Acid)


  • Model: GTBJ1
  • Shipping Weight: 1.5Kgs
  • Manufactured by: Growth Technology

Growth Technology Blackjak 1L (Humic Acid & Fulvic Acid)



Blackjak contains an astonishing 20% pure humic acid

Blackjak is a concentrated suspension of humic, fulvic and ulmic acids plus exotic trace elements. Enhances quality and yield, naturally. Humic acid of this quality and concentration will have a direct beneficial impact on the physical, chemical and biological properties of soils, as well as a direct and positive influence on plants and crops.

Adds fertility to soils and unleashes peak performance from plants.

BLACKJAK is an aqueous liquid suspension of humic, fulvic and ulmic acids that is suitable for soil and foliar application. It can be used alone or mixed with a wide range of plant protection and plant nutrition products to optimize their performance. It enhances the formulation of sugar and starch and promotes root development in all crops.

How Growth Technology – BlackJak works:

Growth Technology BlackJak is possibly the most highly concentrated mixture of humic acid and fulvic acid available on the market, making it great value-for-money. Humic acids and fulvic acids are naturally found in soils where they naturally “chelate” organic material making it easier for plants to absorb nutrients and transport them around itself to where they are needed. Humic acid helps to create a highly biologically active environment for friendly microbes which strengthens the root-zone leading to an overall improvement in plant health, growth speed and eventual crop yield. The improvement in nutrient uptake also helps to create a product of superior quality. Highly recommended product.

Using Growth Technology – BlackJak:

Growth Technology BlackJak can be used on seeds, seedlings, cuttings, young plants, vegging plants and flowering plant. BlackJak is effective for plants grown in any medium and in any type of grow-system. Always shake the bottle well before use. Growth Technology BlackJak can help seed germination – use at 5ml/litre of lukewarm water to pre-soak seeds prior to planting. To use as a drench to pretreat soil before use, mix at 5ml/litre and thoroughly soak the soil. Once plants are growing in soil/coco, use at 1ml/litre of water once a week when hand-watering. For Hydroponic grow-systems, mix BlackJak at 1ml/litre at each reservoir change. For foliar feeding add 1ml/litre of water and mix well. Spray your plants from top to bottom ensuring the tops and bottoms of the leaves are thoroughly wetted. Be careful not to allow any liquid to come in to contact with your grow lamp. The ideal time to spray your plants is in low-light conditions or when the lights have just gone out for the dark period. This helps to avoid leaf-burn due to intense light hitting wet leaves.


As with all nutrients, boosters and additives, never mix them together in their concentrated form (i.e. straight out of the bottle). Always add each nutrient, booster or additive to your reservoir or feed water in turn, giving the solution a good stir to mix it in before adding the next one.


Growth Technology – BlackJak dosage for seed treatment: 5ml/litre.

Growth Technology – BlackJak dosage for soil pre-treatment: 5ml/litre.

Growth Technology – BlackJak dosage for soil/coco feed: 1-2ml/litre weekly.

Growth Technology – BlackJak dosage for hydroponics : 1ml/litre.

Growth Technology – BlackJak dosage as foliar spray: 1ml/litre.

This product was added to our catalog on Friday 20 October, 2017.

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