18-18-18 Multi-Purpose with Black Iron

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

P₂O₅

K₂O

Product sheet and rate chart

Peters Excel pHLow 18-18-18 Multi-purpose is a versatile, multi-use formulation that provides the nutrition plants need to thrive while effectively managing irrigation water alkalinity.

N
N	Total NitrogenNitrate nitrogen (N-NO₃)Ammoniacal nitrogen (N-NH₄)Urea nitrogen (N-Urea)Organic nitrogenUreaformaldehyde (N-MU)	18%10.5%7.5%0%0%0%
P₂O₅
P₂O₅	Phosphorus PentoxideWater soluble (P₂O₅)	18%0%
K₂O
K₂O	Potassium OxideWater Soluble (K₂O)	18%0%
B
B	BoronWater soluble (B)	0.022%0%
Cu
Cu	CopperWater soluble (Cu)Copper EDTA (Cu)	0.022%0%0%
Fe
Fe	IronWater soluble (Fe)Iron EDTA (Fe)Iron DTPA (Fe)Iron EDDHA (Fe)	0.09%0%0%0%0%
Mn
Mn	ManganeseWater soluble (Mn)Manganese EDTA (Mn)	0.045%0%0%
Mo
Mo	MolybdenumWater soluble (Mo)	0.009%0%
Zn
Zn	ZincWater soluble (Zn)Zinc EDTA (Zn)	0.045%0%0%

N
N	Total NitrogenNitrate nitrogen (N-NO₃)Ammoniacal nitrogen (N-NH₄)Urea nitrogen (N-Urea)Organic nitrogenUreaformaldehyde (N-MU)	18%10.5%7.5%0%0%0%
P
P	PhosphorusWater soluble (P)	7.8%0%
K
K	PotassiumWater soluble (K)	14.9%0%
B
B	BoronWater soluble (B)	0.022%0%
Cu
Cu	CopperWater soluble (Cu)Copper EDTA (Cu)	0.022%0%0%
Fe
Fe	IronWater soluble (Fe)Iron EDTA (Fe)Iron DTPA (Fe)Iron EDDHA (Fe)	0.09%0%0%0%0%
Mn
Mn	ManganeseWater soluble (Mn)Manganese EDTA (Mn)	0.045%0%0%
Mo
Mo	MolybdenumWater soluble (Mo)	0.009%0%
Zn
Zn	ZincWater soluble (Zn)Zinc EDTA (Zn)	0.045%0%0%

base formulation—can be used alone or rotated with a customizing component
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 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

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	276
1 tbsp. (level)	2	414
1 cup (level)	25	530
1 pound	100	252

Product properties

Potential acidity	505 lbs. calcium carbonate equivalent per ton
Conductivity (100 ppm N)	0.79 mmhos/cm.
Maximum solubility	4.3 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	1.9	2.4	3.8	5.6	0.20
50	0.6	3.8	4.8	7.5	11.3	0.39
75	0.8	5.6	7.2	11.3	16.9	0.59
100	1.1	7.5	9.6	15.0	22.5	0.79
125	1.4	9.4	12.0	18.8	28.1	0.98
150	1.7	11.3	14.4	22.5	33.8	1.18
175	2.0	13.1	16.8	26.3	39.4	1.38
200	2.3	15.0	19.2	30.0	45.0	1.57
250	2.8	18.8	24.0	37.5	56.3	1.97
300	3.4	22.5	28.8	45.0	67.5	2.36
350	3.9	26.3	33.6	52.5	78.8	2.75
400	4.5	30.0	38.4	60.0	EMS	3.15
450	5.1	33.8	43.2	67.5	EMS	3.54
500	5.6	37.5	48.0	75.0	EMS	3.94
600	6.8	45.0	57.6	EMS	EMS	4.72

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	1422.2	213.3	166.7	106.7	71.1	0.20
50	7111.1	106.7	83.3	53.3	35.6	0.39
75	474.1	71.1	55.6	35.6	23.7	0.59
100	355.6	53.3	41.7	26.7	17.8	0.79
125	284.4	42.7	33.3	21.3	14.2	0.98
150	237.0	35.6	27.8	17.8	11.9	1.18
175	203.2	30.5	23.8	15.2	10.2	1.38
200	177.8	26.7	20.8	13.3	8.9	1.57
250	142.2	21.3	16.7	10.7	7.1	1.97
300	118.5	17.8	13.9	8.9	5.9	2.36
350	101.6	15.2	11.9	7.6	5.1	2.75
400	88.9	13.3	10.4	6.7	EMS	3.15
450	79.0	11.9	9.3	5.9	EMS	3.54
500	71.1	10.7	8.3	5.3	EMS	3.94
600	59.3	8.9	6.9	EMS	EMS	4.72

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

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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

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See product