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

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

P₂O₅

K₂O

Product sheet and rate chart

Find a dealer

Peters Excel pHLow 15-7-25 High-Mag / High-K contains elevated levels of magnesium and potash to provide plants the nutrition they need to thrive while managing the alkalinity of your irrigation water.

N
N	Total NitrogenNitrate nitrogen (N-NO₃)Ammoniacal nitrogen (N-NH₄)Urea nitrogen (N-Urea)Ureaformaldehyde (N-MU)Organic nitrogen	15%10.9%4.1%0%0%0%
P₂O₅
P₂O₅	Phosphorus PentoxideWater soluble (P₂O₅)	7%0%
K₂O
K₂O	Potassium OxideWater Soluble (K₂O)	25%0%
Mg
Mg	MagnesiumWater soluble (Mg)	2.5%2.5%
S
S	SulfurWater soluble (S)	3.3%0%
B
B	BoronWater soluble (B)	0.0175%0%
Cu
Cu	CopperWater soluble (Cu)Copper EDTA (Cu)	0.0175%0.0175%0%
Fe
Fe	IronWater soluble (Fe)Iron EDTA (Fe)Iron DTPA (Fe)Iron EDDHA (Fe)	0.07%0%0%0%0%
Mn
Mn	ManganeseWater soluble (Mn)Manganese EDTA (Mn)	0.035%0%0%
Mo
Mo	MolybdenumWater soluble (Mo)	0.007%0%
Zn
Zn	ZincWater soluble (Zn)Zinc EDTA (Zn)	0.035%0%0%

N
N	Total NitrogenNitrate nitrogen (N-NO₃)Ammoniacal nitrogen (N-NH₄)Urea nitrogen (N-Urea)Ureaformaldehyde (N-MU)Organic nitrogen	15%10.9%4.1%0%0%0%
P
P	PhosphorusWater soluble (P)	3.1%0%
K
K	PotassiumWater soluble (K)	20.8%0%
Mg
Mg	MagnesiumWater soluble (Mg)	2.5%2.5%
S
S	SulfurWater soluble (S)	3.3%0%
B
B	BoronWater soluble (B)	0.0175%0%
Cu
Cu	CopperWater soluble (Cu)Copper EDTA (Cu)	0.0175%0.0175%0%
Fe
Fe	IronWater soluble (Fe)Iron EDTA (Fe)Iron DTPA (Fe)Iron EDDHA (Fe)	0.07%0%0%0%0%
Mn
Mn	ManganeseWater soluble (Mn)Manganese EDTA (Mn)	0.035%0%0%
Mo
Mo	MolybdenumWater soluble (Mo)	0.007%0%
Zn
Zn	ZincWater soluble (Zn)Zinc EDTA (Zn)	0.035%0%0%

Versatile, all-purpose formulation for constant, balanced nutrition
Pure formulation—no filler substances
Effective for water types 2,3 and 4
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

Concentration (ppm N) fertilizer	Average alkalinity reduction (ppm total alkalinity)
100	20
200	40
300	50
400	70

Mix ratios (non-injector)

Fertilizer + Water (gallons) = Approx. N (ppm)

Fertilizer	Water (gallons)	Approx. N (ppm)
1 tsp. (level)	1	235
1 tbsp. (level)	2	353
1 cup (level)	25	452
1 pound	100	180

Product properties

Potential acidity	87.14 lbs. calcium carbonate equivalent per ton
Conductivity (100 ppm N)	0.91 mmhos/cm.
Maximum solubility	3.5 lbs./gal.

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

Target concentration (N/ppm) after dilution						EC (mmhos/cm.) of target feed rate after dilution
			Injector ratios
	1:15	1:100	1:128	1:200	1:300
25	0.3	2.3	2.9	4.5	6.8	0.23
50	0.7	4.5	5.8	9.0	13.5	0.46
75	1.0	6.8	8.6	13.5	20.3	0.68
100	1.4	9.0	11.5	18.0	27.0	0.91
125	1.7	11.3	14.4	22.5	33.8	1.14
150	2.0	13.5	17.3	27.0	40.5	1.37
175	2.4	15.8	20.2	31.5	47.3	1.59
200	2.7	18.0	23.0	36.0	54.0	1.82
250	3.4	22.5	28.8	45.0	EMS	2.28
300	4.1	27.0	34.6	54.0	EMS	2.73
350	4.7	31.5	40.3	EMS	EMS	3.19
400	5.4	36.0	46.1	EMS	EMS	3.64
450	6.1	40.5	51.8	EMS	EMS	4.10
500	6.8	45.0	EMS	EMS	EMS	4.56
600	8.1	54.0	EMS	EMS	EMS	5.47

EMS = exceeds maximum solubility

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

Target concentration (N/ppm) after dilution						EC (mmhos/cm.) of target feed rate after dilution
			Injector ratios
	1:15	1:100	1:128	1:200	1:300
25	1185.2	117.8	138.9	88.9	59.3	0.23
50	592.6	88.9	69.4	44.4	29.6	0.46
75	395.1	29.3	46.3	29.6	19.8	0.68
100	296.3	44.4	34.7	22.2	14.8	0.91
125	237.0	35.6	27.8	17.8	11.9	1.14
150	197.5	29.6	23.1	14.8	9.9	1.37
175	169.3	25.4	19.8	12.7	8.5	1.59
200	148.1	22.2	17.4	11.1	7.4	1.82
250	118.5	17.8	13.9	8.9	EMS	2.28
300	98.8	14.8	11.6	7.4	EMS	2.73
350	84.7	12.7	9.9	EMS	EMS	3.19
400	74.1	11.1	8.7	EMS	EMS	3.64
450	65.8	9.9	7.7	EMS	EMS	4.10
500	59.3	8.9	EMS	EMS	EMS	4.56
600	49.4	7.4	EMS	EMS	EMS	5.47

EMS = exceeds maximum solubility

Consult rate tables printed on bag labels.

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).

Irrigation frequency and volume should be adjusted during the crop production cycle according to crop type, environmental conditions, and desired soluble salt levels.

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).

Store in a clean, cool, dry place.

Brand details

This product is part of the Peters Excel pHLow portfolio

The acidifying action of Excel pHLow stabilizes pH levels in all types of growing media.

Learn more about Peters Excel pHLow

Can be used together with

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 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

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

Explore topics

Water-soluble fertilizer

M-77 Technology

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

Mix ratios (non-injector)

Product properties

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

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

Brand details

Can be used together with