• Guaranteed Analysis
Total Nitrogen (N) 15%
Nitrate nitrogen (N-NO3) 11.8%
Ammoniacal nitrogen (N-NH4) 1.1%
Urea nitrogen (Ur-N) 2.1%
Available Phosphate (P205) 5%
Soluble Potash (K20) 15%
Magnesium (Mg) 2.0%
Water soluble 2.0%
Calcium (Ca) 5.0%
Iron (Fe) 0.08%
Manganese (Mn) 0.04%
Water soluble 0.04%
Boron (B) 0.02%
Copper (Cu) 0.019%
Water soluble 0.019%
Molybdenum (Mo) 0.0075%
Zinc (Zn) 0.038%
Water soluble 0.038%

Product Code


Peters Excel® 15-5-15 Cal-Mag Special

15-5-15 Cal-Mag Special


  • Advantages
  • Directions for use
  • Application Rates
  • Download Product Sheet

Excellent all-purpose formulation combines high nitrate and low phosphate with extra calcium and magnesium. Ideal for Type 2 irrigation water.

  • A (All-Purpose) formulation for constant, balanced nutrition
  • Ideal in operations irrigating with Water Type 2
  • Contains a complete range of essential micronutrients
Directions for use
  • Verify your product analysis and rate for your plants in your production system. For further guidance contact your local ICL Specialty Fertilizer Territory Manager or call ICL Specialty Fertilizer Customer Service at 800-492-8255.
  • Rate tables are printed on bag labels and can be found on product information sheets as well as on www.icl-sf.com.
  • Irrigation frequency and volume should be adjusted during the crop production cycle according to crop type, environmental conditions and desired soluble salt levels.
  • Constant feeding with your irrigation is our normal recommendation for feeding with water soluble fertilizers.
  • A product trial is recommended before adopting a new fertilizer program or making full-scale changes to standard cultural practices. Test several rates on representative plant types.
  • Product storage: Store in a clean, cool, dry place.  Re-seal opened bags by folding top down and securing.
Application Rates


Weight (In Ounces) Of Product Needed To Mix One U.S. Gallon Of Concentrate

Target Fertilizer
Concentration (ppm N)
After Dilution

Injector Ratios

EC mmhos/cm of
Target Feed Rate After Dilution

1:15 1:100 1:200
50 0.7 4.5 9.0 0.35
100 1.4 9.4 18.0 0.69
200 2.7 18.0 36.0 1.38
300 4.1 27.0 *** 2.07


Gallons Of Water Required To Dissolve One 25 Lb Bag Of Fertilizer

Target Fertilizer Concentration
(ppm N) After Dilution

Injector Ratios
1:100 1:200
50 88.9 44.4
100 44.4 22.2
200 22.2 11.1
300 14.8 ***

For a complete list of target concentrations (ppm N), please refer to the Product Information Sheet.

Mixing for watering cans, spray tanks (no injectors)

Amount of Fertilizer       +       Amount of water (gallons)  =       Approximate ppm N
1 tsp. 1 194
1 tbsp. 2 291
1 cup 25 372


Peters Excel Cal-Mag Special is an excellent all-purpose, complete formulation that features high Nitrate Nitrogen and low Phosphate with extra Calcium and Magnesium.  Growing with Peters Excel Cal-Mag Special produces healthy, compact plants over a wide variety of species and cultivars.

Ideal for growers using Type 2 irrigation water (alkalinity measurements of 60 ppm to 150 ppm Calcium Carbonate as defined by the patented Peters A-B+C system)*.


  • A formulation for constant, balanced nutrition in one bag programs.
  • Ideal in operations irrigating with Water Type 2
  • Contains a complete range of essential micronutrients as prescribed by the Peters® M-77® Chelated Micronutrient system.


*The Peters® A-B+C patented product selection system identifies Peters® products as: All-Purpose Products, Base Products and Customizing products.  The use of these products in fertilization programs are determined by the alkalinity of the irrigation water and the plant selection being grown.

The Peters® A-B+C System can be accessed to create or fine tune your fertilization program at https://calculators.icl-sf.com/productselector/