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A. Macroelements
Crop Compounds g/100 liters
(26 US gal.)
Tomatoes (Seedlings to first fruit set-about 40 days)
Part A.
Calcium Nitrate 58 Ca - 140
N - 98
Part B.
Potassium Nitrate 14 N - 20
K - 56
Magnesium Sulfate 31 Mg - 30
S - 40
Monopotassium Phosphate 25 P - 55
K - 70
Potassium Sulfate 39 K - 174

S - 72

Tomatoes (41 days to maturity)
Part A.
Calcium Nitrate 82 Ca - 200
Part B.

N - 140

Magnesium Sulfate 46 Mg. - 45
S - 60
Monopotassium Phosphate 30 P - 65
K - 83
Potassium Sulfate 71 K - 317
S - 131



B. Microelements

g/100 liters
(26 US gal.)
Boric Acid 0.17 B - 0.3
Manganese Sulfate 0.32 Mn - 0.8
Copper Sulfate 0.028 Cu-0.07
Zinc Sulfate 0.045 Zn- 0.10
Sodium Molybdate 0.013 Mo-0.03
Iron Chelate(10% iron) 3.0 Fe - 3.0

Mixing the Nutrient Solution

Prepare the nutrient solution in the following sequence of steps, observing all precautions suggested by manufacturers of the various products.

  1. Fill the nutrient solution tank with water to about one third full.
  2. Dissolve each fertilizer salt separately in a container of hot water.
  3. Add potassium nitrate and potassium sulfate first to the nutrient solution tank.
  4. Fill the solution tank to three-quarters full with water.
  5. Next, add magnesium sulfate and monopotassium phosphate.
  6. While slowly adding calcium nitrate, stir well.
  7. Add all the micronutrients except iron chelate.
  8. Test and adjust the pH to 5.8-6.4.
  9. Add the iron chelate and top-up the tank to final volume.