21-7-7 Acid Special

Customizing component for use with a variety of base formulations

21

N

7

P2O5

7

K2O
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Peters 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.

  • Formulated with extra iron to promote greening

  • Contains NPK, magnesium 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

 

Mix ratios (non-injector)

Fertilizer + Water (gallons) = Approx. N (ppm)
Fertilizer Water (gallons) Approx. N (ppm)
1 tsp1245
1 tbsp2368
1 cup25471

 

Product properties

Potential basicity1518 lbs . calcium carbonate equivalent per ton
Conductivity (100 ppm N)0.52 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
250.21.62.13.24.80.13
500.53.24.16.49.60.26
750.74.86.29.614.50.39
1001.06.48.212.919.30.52
1251.28.010.316.124.10.65
1501.49.612.319.328.90.78
1751.711.314.422.533.80.91
2001.912.916.525.738.61.04
2502.416.120.632.248.21.30
3002.919.324.738.657.91.56
3503.422.528.845.0EMS1.82
4003.925.732.951.4EMS2.08
4504.328.937.057.9EMS2.34
5004.832.241.2EMSEMS2.60
6005.838.649.4EMSEMS3.12
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
251658.9248.8194.4124.482.90.13
50829.4124.497.262.241.50.26
75553.082.964.841.527.60.39
100414.762.248.631.120.70.52
125331.849.838.924.916.60.65
150276.541.532.420.713.80.78
175237.035.527.817.811.80.91
200207.431.124.315.610.41.04
250165.924.919.412.48.31.30
300138.220.716.210.46.91.56
350118.517.813.98.9EMS1.82
400103.715.612.27.8EMS2.08
45092.213.810.86.9EMS2.34
50082.912.49.7EMSEMS2.60
60069.110.48.1EMSEMS3.12
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.
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