Master B - 32 oz. - Humboldt Nutrients

Humboldt NutrientsSKU: DL-HNMB405

Sale price$28.58


Master B is a two-part nutrient program suitable for all types of plants and in any growing medium. It is formulated using high-quality and non-toxic ingredients. It offers your plants a high absorption of vitamins, minerals, trace elements, and nutrients. This powerful nutrient solution also does not contain any EDTA.

Derived from:

  • Potassium Carbonate

  • Magnesium Phosphate

  • Ammonium Nitrate

  • Monopotassium Phosphate

  • Magnesium Sulfate

  • Potassium Nitrate

  • Mono Ammonium Phosphate

  • Magnesium Nitrate

  • Dipotassium Phosphate 

How to Use?

Step 1: Simply fill the clean reservoir with water. Make sure the water level is enough to flood your desired region.

Step 2: Add master A to the reservoir and thoroughly combine it in.

Step 3: Then, add Master B.

Note: Avoid mixing the master A and master B solution in the concentrated forms.

Step 4: Adjust the pH of the reservoir between 5.5 and 6.5. It is vital to keep the reservoir temperature between 65 and 75 degrees Fah.

Step 5: Now, drain and clean the reservoir. Pump once a week to prevent salt build-up.

Note: Do not store the reservoir under direct sunlight and at an extremely low temperature.

Application Rates

  1. a) Growth Stage

Master A: 1ML/L Master B: 0.5 ML/L

  1. b) Flowering (Transition/Early)

Master A: 1ML/L Master B: 1 ML/L

  1. c) Full Bloom (Fruiting Stage Week - 4 to 8)

Master A: 2ML/L Master B: 2 ML/L

Foliar Application: Use Master B solution at a rate of 5 ml/gallon of finished spray solution.


  • SKU /Model Number: DL-HNMB405

  • Brand: Humboldt Nutrients

  • Item Weight: 2 pounds

  • Liquid Volume: 32 ounce

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