Hydroponic Fertilizer Formulation for Cannabis Using Peters 10-30-20

The following is a simple fertilization formula for growing cannabis in soil-less media or in hydroculture. This formulation has been trialed successfully in my gardens in Fafard Urban Mix A peat lite growing media.

This formula can be run throughout the life cycle of the crop, from the seedling stage to finish. However, I have found that running a formula that is lower in phosphorus during vegetative growth reduces stretch and results in a more compact plant.

Peter’s 10-30-20 is an acidic reaction fertilizer with a 365 lb. calcium carbonate equivalency per ton. It contains Peter’s Exclusive M77 Micronutrient System.

Materials needed:

Peters Professional 10-30-20 water soluble fertilizer. – sold in 25 lbs. bag

Magnesium Sulphate (Epsom Salts) – sold in 50 lbs. bag

To make a single tank concentrate to be injected into a water line at 1:100 mix the following:

378.0g Peters Professional 10-30-20 water soluble fertilizer

46.0g Magnesium Sulphate (Epsom Salts)

water to make 1 gallon

Inject this concentrate at 1:100 to deliver PPM 100-130-166-00-25 (N-P-K-Ca-Mg). This will make exactly 100 gallons of working solution.

To make a working solution to be top fed, dripped or used in flood tables mix the following:

3.78g/gallon Peters Professional 10-30-20 water soluble fertilizer

0.46g/gallon Magnesium Sulphate (Epsom Salts)

Mixed together this will deliver PPM 100-130-166-00-25 (N-P-K-Ca-Mg).

*Note: this formulation does not provide a calcium component. Calcium is provided as lime in the Peat-Lite media I use. I recommend Fafard Urban Mix A or Fafard Organic Formula FOF-30. These mixes are both limed at a rate of 3lbs/yard.

As usual, your feedback is both invited and appreciated.

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5 Responses to Hydroponic Fertilizer Formulation for Cannabis Using Peters 10-30-20

  1. […] veg these using the Peters 20-10-20 formulation, then switch to the Peters 10-30-20 formulation when it’s time to induce flowering. It will be interesting to see these old Spaniards come to […]

  2. […] @ 55 Days Flower Photos of the Dakini Kush at 55 days flower (12/12). I switched to the Peters 10-30-20 formulation at 28 […]

  3. […] 1 week the seedlings were fed Peters 10-30-20 @ 100 PPM N. The formulation can be found in this post. That bump in phosphorus in the early days of growth improves the vigor of the young […]

  4. […] that time I’ll switch to the Peters 10-30-20 and cut the day length to 12 hours. Until […]

  5. […] time to induce flowering in these plants. I shortened the day length to 12 hours and fed with the Peters 10-30-20 @ 100PPM N. The plants have grown considerably since […]

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