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21-7-7 Acid Special
Customizing component for use with a variety of base formulations
21
N7
P2O57
K2OPeters Professional 21-7-7 Acid Special was designed exclusively for high-acid crops. Offsets high alkalinity water while effectively lowering pH levels in growing media.
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Formulated with extra iron to promote greening
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Contains NPK, magnesium and micronutrients
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Developed for peat-based cultures (pot plants, bedding plants and container nursery stock)
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Exclusive M-77® 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 | 1 | 245 |
| 1 tbsp | 2 | 368 |
| 1 cup | 25 | 471 |
Product properties
| Potential basicity | 1518 lbs . calcium carbonate equivalent per ton |
|---|---|
| Conductivity (100 ppm N) | 0.52 mmhos/cm. |
| Maximum solubility | 4 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 | 0.2 | 1.6 | 2.1 | 3.2 | 4.8 | 0.13 | ||||||
| 50 | 0.5 | 3.2 | 4.1 | 6.4 | 9.6 | 0.26 | ||||||
| 75 | 0.7 | 4.8 | 6.2 | 9.6 | 14.5 | 0.39 | ||||||
| 100 | 1.0 | 6.4 | 8.2 | 12.9 | 19.3 | 0.52 | ||||||
| 125 | 1.2 | 8.0 | 10.3 | 16.1 | 24.1 | 0.65 | ||||||
| 150 | 1.4 | 9.6 | 12.3 | 19.3 | 28.9 | 0.78 | ||||||
| 175 | 1.7 | 11.3 | 14.4 | 22.5 | 33.8 | 0.91 | ||||||
| 200 | 1.9 | 12.9 | 16.5 | 25.7 | 38.6 | 1.04 | ||||||
| 250 | 2.4 | 16.1 | 20.6 | 32.2 | 48.2 | 1.30 | ||||||
| 300 | 2.9 | 19.3 | 24.7 | 38.6 | 57.9 | 1.56 | ||||||
| 350 | 3.4 | 22.5 | 28.8 | 45.0 | EMS | 1.82 | ||||||
| 400 | 3.9 | 25.7 | 32.9 | 51.4 | EMS | 2.08 | ||||||
| 450 | 4.3 | 28.9 | 37.0 | 57.9 | EMS | 2.34 | ||||||
| 500 | 4.8 | 32.2 | 41.2 | EMS | EMS | 2.60 | ||||||
| 600 | 5.8 | 38.6 | 49.4 | EMS | EMS | 3.12 | ||||||
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 | 1658.9 | 248.8 | 194.4 | 124.4 | 82.9 | 0.13 | ||||||
| 50 | 829.4 | 124.4 | 97.2 | 62.2 | 41.5 | 0.26 | ||||||
| 75 | 553.0 | 82.9 | 64.8 | 41.5 | 27.6 | 0.39 | ||||||
| 100 | 414.7 | 62.2 | 48.6 | 31.1 | 20.7 | 0.52 | ||||||
| 125 | 331.8 | 49.8 | 38.9 | 24.9 | 16.6 | 0.65 | ||||||
| 150 | 276.5 | 41.5 | 32.4 | 20.7 | 13.8 | 0.78 | ||||||
| 175 | 237.0 | 35.5 | 27.8 | 17.8 | 11.8 | 0.91 | ||||||
| 200 | 207.4 | 31.1 | 24.3 | 15.6 | 10.4 | 1.04 | ||||||
| 250 | 165.9 | 24.9 | 19.4 | 12.4 | 8.3 | 1.30 | ||||||
| 300 | 138.2 | 20.7 | 16.2 | 10.4 | 6.9 | 1.56 | ||||||
| 350 | 118.5 | 17.8 | 13.9 | 8.9 | EMS | 1.82 | ||||||
| 400 | 103.7 | 15.6 | 12.2 | 7.8 | EMS | 2.08 | ||||||
| 450 | 92.2 | 13.8 | 10.8 | 6.9 | EMS | 2.34 | ||||||
| 500 | 82.9 | 12.4 | 9.7 | EMS | EMS | 2.60 | ||||||
| 600 | 69.1 | 10.4 | 8.1 | EMS | EMS | 3.12 | ||||||
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.
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