Master A - Premium 2 Part Bloom Hydroponic Nutrient - Quart

Master A - Premium 2 Part Bloom Hydroponic Nutrient - Quart


This is one part of a two part nutrient. You need to order both parts for a complete formula

We would all like to master something in our lifetime. If you are looking for a professional 2-Part Premium Base Nutrient Program that outperforms the competition, you're looking for our award-winning Master A and Master B. We harvested the brightest minds from Humboldt County and sat them down with the most accomplished and innovative scientists to develop this vigorous, non-toxic program for use on any plant, in any medium. Master A and Master B excel in all soils, coco, and peat based soilless mixes due to their ability to maintain a lower overall salt index.

Humboldt Nutrients Master A&B is a premium two-part fertilizer program designed for all plants made with non-toxic, high quality ingredients.

Humboldt Nutrients has formulated this vigorous 2-part nutrient solution for use on any plant, in any growing medium and contains no EDTA's.

The Humboldt Nutrients team of chemists and agronomists emphasize balance and consistency with all our formulas. Master A and Master B are formulated to provide your favorite plants with higher absorption of nutrients, vitamins, minerals and trace elements.

The Master A and Master B series stands apart from your standard base nutrient line by making macro and micro nutrients more available to your plant.

Used in conjunction with Humboldt Nutrients' powerful additives we assure that your yields and quality will increase so dramatically that your friends will call you, simply, "The Master."

Guaranteed Analysis

Total Nitrogen (N).....4.00%
Ammoniacal Nitrogen0.80%
Nitrate Nitrogen3.20%
Soluble Potash (K20)...3.00%
Calcium (Ca)..1.70%
Molybdenum (Mo) 0.0008%
Zinc (Zn).0.05%
Water Soluble Zinc..0.05%

Derived From: Ammonium Nitrate, Potassium Nitrate, Calcium Nitrate, Sodium Molybdate, Calcium Carbonate, Sodium Borate, Iron, Zinc, Manganese, Boron and Molybdenum.


Fill your reservoir with clean water before administering any nutrient or additive. Make sure that the water level in your reservoir is sufficient enough to effectively flood your desired area or table. Potential nutrient lock-out can be avoided by adding Master A to your reservoir first and thoroughly mixing it in, then add Master B. Never mix these nutrients together in their concentrated forms. After adding in each nutrient adjust the pH of your reservoir between 5.5 and 6.5. Keep the water temperature in your reservoir between 65 and 75 F. Drain and clean your reservoir and pumps at least once a week to prevent any salt buildup. Avoid storing in direct sunlight and protect from freezing.

Application Rates:


1ML/L 0.5ML/L



Foliar Application: Apply at a rate of 5ml per gallon of finished spray solution.

Item Number: 134506
Universal Product Code: 837654466568
Manufacturer: Humboldt Nutrients
Manufacturer's Part Number: MA405
Brand: Humboldt Nutrients


pdf file MSDS Sheet
pdf file Master A&B Re-Circulating Feeding Schedule Moderate 10 Week Color
pdf file Master A&B Drain To Waste Feeding Schedule Moderate 10 Week Color

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