21-5-20 Multi-Purpose / No Boron

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

21

N

5

P2O5

20

K2O
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Moderately acidic formulation ideal for general purpose use in areas with boron-heavy irrigation water.

  • Formulation is designed for water with higher alkalinity and boron

  • No filler substances

  • effective for water types 2, 3, and 4

  • Contains NPK and micronutrients

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

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

  • Not compatible with Peters Excel pHLow 21-7-7 Acid Hammer

Mix ratios (non-injector)

Fertilizer + Water (gallons) = Approx. N (ppm)
FertilizerWater (gallons)Approx. N (ppm)
1 tsp. (level)1320
1 tbsp. (level)2480
1 cup (level)25614
1 pound100252

 

 

Product properties

Potential acidity377 lbs. calcium carbonate equivalent per ton
Conductivity (100 ppm N)0.643 mmhos/cm.
Maximum solubility4 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
250.21.62.13.24.80.16
500.53.24.16.49.60.32
750.74.86.29.614.50.47
1001.06.48.212.919.30.63
1251.28.010.316.124.10.79
1501.49.612.319.328.90.95
1751.711.314.422.533.81.10
2001.912.916.525.738.61.26
2502.416.120.632.248.21.58
3002.919.324.738.657.91.89
3503.422.528.845.0EMS2.21
4003.925.732.951.4EMS2.52
4504.328.937.057.9EMS2.84
5004.832.241.2EMSEMS3.15
6005.838.649.4EMSEMS3.78
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
251658.9248.8194.4124.482.90.16
50829.4124.497.262.241.50.32
75553.082.964.841.527.60.47
100414.762.248.631.120.70.63
125331.849.838.924.916.60.79
150276.541.532.420.713.80.95
175237.035.527.817.811.81.10
200207.431.124.315.610.41.26
250165.924.919.412.48.31.58
300138.220.716.210.46.91.89
350118.517.813.98.9EMS 2.21
400103.715.612.27.8EMS 2.52
45092.213.810.86.9EMS 2.84
50082.912.49.7EMS EMS 3.15
60069.110.48.1EMS EMS 3.78
EMS = exceeds maximum solubility

1
Consult rate tables printed on bag labels.
2
Verify product analysis, longevity, and rate for plants in your production system (for assistance, contact your regional ICL Territory Manager or 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

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

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

15-5-15

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

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

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

15-5-15
See product
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