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The Peters Professional Acid Special 21-7-7 (E99330) is a water soluble fertilizer that helps in producing healthy and acid loving crops. It has a formula with high potential acidity that lowers pH levels or offsets high water alkalinity in growing media. This fertilizer is the excellent choice for water type 3 and 4. It also contains a great range of micronutrients that's essential to promote greening.
Product Documents
| Active Ingredient | Total Nitrogen - 21% Available Phosphate - 7% Soluble Potash - 7% Magnesium - 0.6%, Sulfur - 13.0%, Boron - 0.0262%, Copper - 0.0262%, Iron - 0.15%, Manganese - 0.05%, Molybdenum - 0.01%, Zinc - 0.05% |
|---|---|
| For use in | Acid Loving Crops |
| Application |
1 tsp per 1 gallon of water (1 tbsp per 2 gallons of water) * Can be tank mixed for watering cans and spray tanks except injectors * See label for complete application instructions |
| Color | Blue |
| Material / Construction | Ammonium Phosphate, Ammonium Sulfate, Urea, Potassium Sulfate, Magnesium Sulfate, Boric Acid, Copper EDTA, Iron EDTA, Manganese EDTA, Ammonium Molybdate, Zinc EDT |
| Special Features | Water Soluble Fertilizer |
| Shipping Weight | 25.26 lbs |
| Manufacturer | Everris Na Inc. (Mfg. Number: E99330) |
| UPC | 848264006792 |
Produce healthy acid-loving crops with this formula’s high potential acidity that offsets high water alkalinity or lowers pH levels in growing media.
Product Properties:
Potential Acidity .......................... 1518 lbs calcium carbonate equivalent per ton
Conductivity of 100 ppm N ......... 0.52 mmhos/cm
Maximum Solubility ..................... 4 lbs/gallon
| 5 stars | 3 | |
| 4 stars | 0 | |
| 3 stars | 0 | |
| 2 stars | 0 | |
| 1 star | 0 |
Good response
By Charles on 06/11/2016
We have used Acid Special 21-7-7 for many years on blueberries in pots in the greenhouse with excellent response It gives a rapid response before a dry, slow release becomes available. Order and shipping were handled well and price was competitive. CMM, North Carolina
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6 of 7 people found this review helpful
The Blueberry Person
By Norm on 09/15/2022
Great Stuff
By Plant on 03/21/2025
The product label for Peters Professional Acid Special 21-7-7 states you use 1 tsp of product with 1 gallon of water equals 245 ppm (Parts per Million) of Nitrogen.
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5 of 7 people found this answer helpful
Peters Professional Acid Special 21-7-7 would not help in eliminating bamboo. Bamboo is very tough to kill and will take repeat applications using a non selective such as Roundup QuickPro.
Bamboo stalks should be cut and apply the non selective herbicide directly to the fresh cut stump.
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3 of 3 people found this answer helpful
My shallow well water is 8.5-9 pH. Will the acidic nature of this product harm my regular vegetables if my water pH is that high?
Generally speaking, if the pH of a fertilizer solution and/or surrounding media is too high or too low, the result can be slow, weak, and malformed growth. Extreme levels of acidity and alkalinity (pH) can cause some nutrients to become toxic, even killing plants. However, in this case, we would recommend contacting the manufacturer of Peters Professional Acid Special 21-7-7 directly for product support and clarification by either calling them at 1-800-492-8255 or by visiting their website's contact page here.
Peters Professional Acid Special 21-7-7
Rating: 5 (3 Reviews / 3 Q&A)
