Peters Professional Acid Special 21-7-7


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5 out of 5 stars Rating: 5

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{ $45.63 { $43.87
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Peters Professional Acid Special 21-7-7 bag (25 lbs)

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Peters Professional Acid Special 21-7-7

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.

Produce healthy acid-loving crops with this formula’s high potential acidity that offsets high water alkalinity or lowers pH levels in growing media.

  • C (Customizing) component can be used with a variety of B (Base) formulations
  • Excellent choice for Water Types 3 and 4
  • Contains a full range of essential micronutrients plus extra iron to promote greening

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

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  • 5 of 5 stars  Good response
    By Charles in Castle Hayne, NC 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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02/28/2016 Cheryl from Austin, Tx

QIs there any way to calculate N/gal at a given concentration of Peters Professional Acid Special 21-7-7?


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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