Humboldt Nutrients

Master A – 2.5 Gal. – Humboldt Nutrients

Master A – 2.5 Gal. – Humboldt Nutrients

Humboldt Nutrients is dedicated to offer you best products for healthy plant growth. It is constantly involved into offering unique products for both indoor hydroponics systems like indoor grow cabinets and grow boxes and also outdoor gardening. Its nutrients are correctly formulated to improve overall plant structure benefitting you and your plants.

Humboldt Nutrients has formulated this vigorous Master A and Master B 2-part nutrient solution. Master A Humboldt Nutrients comes in various sizes such as 16 oz, 32 oz, 1 gal, 2.5 gal, 5 gal and 15 gallons. The more detail of the Master A – 2.5 Gal type of Humboldt Nutrients is briefed below.

The Master A – 2.5 Gal. – Humboldt Nutrients is a useful nutrient on any kind of plant. In addition, it is also suitable for any growing medium and contains no EDTA. The Humboldt Nutrients contains a team of enthusiastic chemists and agronomists that lay emphasis on maintaining balance and consistency in all its formulation. Master A – 2.5 Gal. is formulated to offer your favorite plants with higher absorption of nutrients, vitamins, minerals and trace elements. Additionally, Master A by Humboldt Nutrients is a first-class two-part fertilizer program. It is specially designed for use in all types of plants.


The ingredient used in making Master A – 2.5 Gal. – Humboldt Nutrients are non-toxic and are of superior quality. The Master A – 2.5 Gal. – Humboldt Nutrients sets apart from other nutrients by allowing macro and micro nutrients more readily available to your plant.

The Master A – 2.5 Gal. – Humboldt Nutrients contains almost all essential nutrients for healthy plant growth. The Nitrogen, Phosphorous, and Potash (Potassium) NPK compounds are in the ratio of 4-0-3. Out of the total 4 % Nitrogen (N), Ammoniacal Nitrogen is 0.80% and Nitrate Nitrogen is 3.20%. The Soluble Potash is 3.00%, Calcium -1.70%, Molybdenum is 0.0008%, Zinc is 0.05% and Water Soluble Zinc is 0.05%.

All these ingredients are derived from – Ammonium Nitrate, Potassium Nitrate, Calcium Nitrate, Sodium Molybdate, Calcium Carbonate, Sodium Borate, Iron, Zinc, Manganese, Boron and Molybdenum.


First, clean your reservoir with clean water before adding any nutrient or other additives. Now ensure that the water level in your reservoir is adequate to effectively flood your grow area or tray. Thoroughly mix the Master A – 2.5 Gal. – Humboldt Nutrients into your reservoir. Never mix two varieties of concentrated nutrients together into the reservoir to avoid nutrient lock-out. After adding all the nutrients, check and modify reservoir pH between 5.5 and 6.5. Also, check water temperature of your reservoir and maintain it between 65 and 75 °F.
It is recommended to drain and clean your reservoir and pumps at least once in a week. This will prevent any salt buildup in your reservoir. Also store the Master A – 2.5 Gal. – Humboldt Nutrients away from direct sunlight and protect it from freezing.

Mixing Instructions

The Master A – 2.5 Gal. – Humboldt Nutrients is useful in all phases of plant life cycle. In growth stage mix 1ml in per liter water, in flowering or early stage also you can use 1ml in per liter of water and in full bloom or fruiting stage use 2ml in one liter water. For foliar application you can apply 5ml per gallon of finished spray solution on the plant leaves.

Using Master A and Master B – 2.5 Gal. – Humboldt Nutrients in combination with other powerful Humboldt Nutrients’ your yields and quality will drastically improve.

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Brand Name
Humboldt Nutrients
Product Name
Master A 4-0-3
$ 106.45
Product Availability
Available in Stock

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