15-5-15 Cal-Mag Special with Black Iron

Contains three chelated irons, including black iron—the most effective for growing ornamentals

15

N

5

P2O5

15

K2O
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Peters Excel 15-5-15 Cal-Mag Special is a specialized formulation that provides a continuous supply of the calcium and magnesium not found in soft water systems. High nitrate and low phosphate levels encourage healthy, compact growth.

  • Versatile, all-purpose formulation for constant, balanced nutrition

  • Pure formulation—no filler substances

  • Elevated levels of chelated trace elements ensure robust growth and rich color

  • Contains NPK, magnesium and micronutrients

  • Developed for peat-based cultures (pot plants, bedding plants and container nursery stock)

  • Exclusive M-77® black iron chelating formula for fast, efficient nutrient uptake

Mix ratios (non-injector)

Fertilizer + Water (gallons) = Approx. N (ppm)
Fertilizer Water (gallons)
Approx. N (ppm)
1 tsp. (level)1194
1 tbsp. (level)2291
1 cup (level)25372
1 pound100180

 

 

Product properties

Potential basicity133.77 lbs. calcium carbonate equivalent per ton
Conductivity (100 ppm N)0.69 mmhos/cm.
Maximum solubility3 lbs./gal.

 

 

Weight (oz.) of product needed to mix one gallon of concentrate

Target concentration (N/ppm) after dilutionEC (mmhos/cm.) of target feed rate after dilution
Injector ratios
1:151:1001:1281:2001:300
250.32.32.94.56.80.17
500.74.55.89.013.50.35
751.06.88.613.520.30.52
1001.49.011.518.027.00.69
1251.711.314.422.533.80.86
1502.013.517.327.040.51.04
1752.415.820.231.547.31.21
2002.718.023.036.0EMS1.38
2503.422.528.845.0EMS1.73
3004.127.034.6EMSEMS2.07
3504.731.540.3EMSEMS2.42
4005.436.046.1EMSEMS2.76
4506.140.5EMSEMSEMS3.11
5006.845.0EMSEMSEMS3.45
6008.1EMSEMSEMSEMS4.14
EMS = exceeds maximum solubility

 

 

Gallons of water needed to dissolve one 25 lb. bag of fertilizer

Target concentration (N/ppm) after dilutionEC (mmhos/cm.) of target feed rate after dilution
Injector ratios
1:151:1001:1281:2001:300
251185.2177.8138.988.959.30.17
50592.688.969.444.429.60.35
75395.159.346.329.619.80.52
100296.344.434.722.214.80.69
125237.035.627.817.811.90.86
150197.529.623.114.89.91.04
175169.325.419.812.78.51.21
200148.122.217.411.1EMS1.38
250118.517.813.98.9EMS1.73
30098.814.811.6EMSEMS2.07
35084.712.79.9EMSEMS2.42
40074.111.18.7EMSEMS2.76
45065.89.9EMSEMSEMS3.11
50059.38.9EMSEMSEMS3.45
60049.4EMSEMSEMSEMS4.14
EMS = exceeds maximum solubility

1
Consult rate tables printed on bag labels.
2
Verify product analysis and rate for plants in your production system (for assistance, contact your regional ICL Territory Manager or for testing call the ICL Lab at 877-467-8522).
3
Irrigation frequency and volume should be adjusted during the crop production cycle according to crop type, environmental conditions, and desired soluble salt levels.
4
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).
5
Store in a clean, cool, dry place.

Brand details

This product is part of the Peters Excel portfolio

Ideal for growing applications with high PH irrigation water.

Learn more about Peters Excel

Can be used together with

Peters Excel pHLow

Contains three chelated irons, including black iron—the most effective for growing ornamentals

15-7-25 High-Mag / High K with Black Iron

15-7-25

See product

Peters Excel pHLow

Contains three chelated irons, including black iron—the most effective for growing ornamentals

18-18-18 Multi-Purpose with Black Iron

18-18-18

See product

Peters Excel pHLow

Contains three chelated irons, including black iron—the most effective for growing ornamentals

19-11-21 Multi-Purpose with Black Iron

19-11-21

See product

Peters Professional

Base formulation for constant, balanced nutrition

13-2-13 Plug and Bedding Plant Special

13-2-13

See product

Peters Excel

Versatile, all-purpose formulation for constant, balanced nutrition in moderately alkaline waters

15-2-20 Pansy / Salvia / Vinca

15-2-20

See product

Peters Excel

Elevated levels of chelated trace elements ensure robust growth and rich color.

21-5-20 Multi-Pupose

21-5-20

See product

Peters Excel pHLow

Contains three chelated irons, including black iron—the most effective for growing ornamentals

15-7-25 High-Mag / High K with Black Iron

15-7-25
See product

Peters Excel pHLow

Contains three chelated irons, including black iron—the most effective for growing ornamentals

18-18-18 Multi-Purpose with Black Iron

18-18-18
See product

Peters Excel pHLow

Contains three chelated irons, including black iron—the most effective for growing ornamentals

19-11-21 Multi-Purpose with Black Iron

19-11-21
See product

Peters Professional

Base formulation for constant, balanced nutrition

13-2-13 Plug and Bedding Plant Special

13-2-13
See product

Peters Excel

Versatile, all-purpose formulation for constant, balanced nutrition in moderately alkaline waters

15-2-20 Pansy / Salvia / Vinca

15-2-20
See product

Peters Excel

Elevated levels of chelated trace elements ensure robust growth and rich color.

21-5-20 Multi-Pupose

21-5-20
See product
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