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Garden Variety Organics

Carl Pool Hydroponic Special 4-18-38 Water Soluble Fertilizer

Carl Pool Hydroponic Special 4-18-38 Water Soluble Fertilizer

$ 59.95
$ 69.95 $ 59.95
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From Texas-based crop specialist Carl Pool comes a water soluble fertilizer that serves as a complete nutrient source for a wide variety of crops grown in both hydroponics systems and and soil-based agriculture.

Carl Pool 4-18-38 Hydroponic Special is a complete blend of essential plant nutrients -- including magnesium and sulfur -- with no need to add Epsom salt (magnesium sulfate) to create a Part B of a two-part nutrient solution. 

Carl Pool 4-18-38 Hydroponic Special is comparable to Masterblend 4-18-38 Tomato Formula but is more economical as it needs no magnesium sulfate supplementation.

We mix Carl Pool 4-18-38 Hydroponic Special at the rate of 1 pound of fertilizer per 1 gallon of water to create a Part B nutrient concentrate. We then dose the concentrate at the rate of 1-2 ounces per gallon of water along with an equal rate of calcium nitrate to achieve the target E.C. value for our crops -- an E.C. of 2.0 for most fruits, vegetables and flowers.

Generally, one 25-pound bag makes 25 gallons of concentrate. Then, 25 gallons of concentrate treats approximately 3,200 gallons of water applied to crops, depending on the crop (lettuce needs a lower concentration of nutrients, whereas tomatoes need a higher concentration). 

Carl Pool 4-18-38 Hydroponic Special is derived from:

  • Monoammonium Phosphate
  • Calcium Nitrate
  • Potassium Nitrate
  • Urea
  • Magnesium Sulfate
  • Boric Acid
  • Manganese EDTA
  • Ammonium Molybdate
  • Zinc EDTA 

Guaranteed Analysis:

  • Total Nitrogen: 4.0% (3.36% Nitrate Nitrogen, 0.64% Urea Nitrogen)
  • Available Phosphate (P2O5): 18%
  • Soluble Potash (K2O): 38%
  • Magnesium (Mg): 0.95%
  • Sulfur (S): 1.25%
  • Boron (B): 0.02%
  • Copper (Cu): 0.05%
  • Iron (Fe): 0.4%
  • Manganese (Mn): 0.2%
  • Molybdenum (Mo): 0.01%
  • Zinc (Zn): 0.05%

Carl Pool 4-18-38 Hydroponic Special is excellent for a wide variety of crops, including: lettuce, kale, collard greens, peppers, cantaloupe, tomatoes, cucumbers, okra, squash, watermelons, flowers, ornamentals and more.

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