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Tomato Formula


4-18-38 tomato formula is well-suited for for both soil based and hydroponic growing. Ideal for tomatoes, peppers, leafy greens and more! As with all of our water-soluble formulas, our 4-18-38 completely dissolves in water with no fallout and won’t clog sprayers or automated fertilizer delivery systems.

SKU: masterblend-tomato Category: Tags: , , ,
4-18-38 Tomato Formula Guaranteed Analysis
Total Nitrogen (N)
3.5% Nitrate Nitrogen
0.5% Ammoniacal Nitrogen
Available Phosphate (P2O5) 18%
Soluble Potash (K2O) 38%
Magnesium (Mg) (Total)
0.50% Water Soluble Magnesium (Mg)
Boron (B) 0.20%
Copper (Cu)
0.05% Chelated Copper (Cu)
Iron (Fe)
0.40% Chelated Iron (Fe)
Manganese (Mn)
0.20% Chelated Manganese (Mn)
Molybdenum (Mo 0.01%
Zinc (Zn)
0.05% Chelated Zinc (Zn)


  • Plant nutrients derived from: potassium nitrate, potassium phosphate, ammonium phosphate, potassium chloride, magnesium sulfate, boric acid, copper EDTA, iron DTPA, manganese EDTA, sodium molybdate, zinc EDTA.
  • Potential Basicity:  209 lbs. Calcium Carbonate Equivalent Per Ton.


Weight N/A
Dimensions N/A
Weight 11.34 kg, 1.0 kg, 500g, 250g, 100g

Spray Tank:
Mix 8 oz. in 100 gallons of water, along with 8 oz. of Calcium Nitrate and 5 oz. of Magnesium Sulfate.
Apply 1 quart per square foot as a normal watering on a 1 to 2 week basis. Adjust PH to 6.4 – 7.7.

Mix 8 oz. in 100 gallons of water, along with 6 oz. of Calcium Nitrate and 4 oz. of Magnesium Sulfate.
Apply on a 2 – 3 week basis.

Maximum Solubility: 3.5 lbs. Per gallon.

Use this product only after a thorough water quality analysis has been performed. Discuss results with an expert. Weekly testing may be necessary. Be certain to monitor media quality as well. Soil and plant tissue analysis are also recommended.

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