• oxide
Nitrogen Total (N) 0%
Phosphorus Pentoxide (P205) 0%
Potassium Oxide (K20) 0%
Iron (Fe) 7.50%
Water soluble 7.50%
Manganese (Mn) 8.00%
Water soluble 8.00%
Boron (B) 1.35%
Copper (Cu) 2.300%
Water soluble 2.300%
Molybdenum (Mo) 0.040%
Zinc (Zn) 4.500%
Water soluble 4.500%

Product Code


Peters® Professional STEM



  • Advantages
  • Directions for Use
  • Suggested Application Rates

The industry’s standard micronutrient supplement, providing the all-important “quick fix” nutrition for more than 50 years.

  • C (Customizing) component can be used with a variety of B (Base) formulations
  • Effective for all Water Types
  • Contains the ideal balance of all essential micronutrients
Directions for Use

Always be aware of media pH and the total amount of the minor nutrients provided to the plant. STEM does take longer to dissolve into your stock tank than most of our Peters fertilizer water soluble products.  Commonly used in addition to water soluble blends without micronutrient or to boost the micronutrient levels when standard blends are used a low levels.

Suggested Application Rates
Mixing for watering cans, spray tanks (no injectors) using approximate volume measures
Amount of Fertilizer Low Application Rate Med. Application Rate High Application Rate
1 tsp. 9 gallons 4.5 gallons 2.25 gallons
1 tbsp. 27 gallons 13.5 gallons 6.75 gallons
1 cup 432 gallons 216 gallons 108 gallons

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The industry's standard micronutrient supplement, providing the all-important "quick fix" nutrition for more than 50 years.