BillFarthing
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I always try to do things as simply (and cheap!) as possible. Here is a 4-3-5 one-part fertilizer recipe suitable for hydroponics, soil or soilless. It is a clone of Fox Farm Grow Big Hydro, Skunkwerks RX or Cogos Original complete. You can get the ingredients at Custom Hydro Nutrients. Here is the recipe:
Potassium Nitrate KNO3 285 grams
Calcium Nitrate (Tetrahydrate) Ca(NO3)2.4H2O 285 g
Magnesium Nitrate (Hexahydrate) Mg(NO3)2.6H2O 187 g
Ammonium Monobasic Phosphate (NH4)H2PO4 75 g
Pekacid 27 g
Chelated Micros 18 g
N (NO3-) 123.804
K 149.665
P 36.01
Mg 23.416
Ca 63.883
S 0.01
Fe 2.092
Zn 0.16
B 0.519
Cu 0.04
Mo 0.024
Na 0
Si 0
Cl 0
Mn 0.798
N (NH4+) 12.066
Use ~1 tsp./gallon as a raw salt. If you want to make a stock solution, add 1.5L DI/RO/distilled water to a clean and food safe jug. Add the salts. Top up to 3L. Use 9-12ml/gallon.
It is a 10:1 NO3-:NH4+ nitrogen ratio, so the pH should be very stable. The cal-mag ratio is perfect, but low. Add a high quality cal-mag supplement like Growmore Flowering Cal-Mag if you run into issues. The sulfur is low to get it into one bottle as a 1-part fertilizer, so if you have any other issues or have hard tap water, use a high quality fulvic acid like Mr. Fulvic.
It works well. Give it a try!
Potassium Nitrate KNO3 285 grams
Calcium Nitrate (Tetrahydrate) Ca(NO3)2.4H2O 285 g
Magnesium Nitrate (Hexahydrate) Mg(NO3)2.6H2O 187 g
Ammonium Monobasic Phosphate (NH4)H2PO4 75 g
Pekacid 27 g
Chelated Micros 18 g
N (NO3-) 123.804
K 149.665
P 36.01
Mg 23.416
Ca 63.883
S 0.01
Fe 2.092
Zn 0.16
B 0.519
Cu 0.04
Mo 0.024
Na 0
Si 0
Cl 0
Mn 0.798
N (NH4+) 12.066
Use ~1 tsp./gallon as a raw salt. If you want to make a stock solution, add 1.5L DI/RO/distilled water to a clean and food safe jug. Add the salts. Top up to 3L. Use 9-12ml/gallon.
It is a 10:1 NO3-:NH4+ nitrogen ratio, so the pH should be very stable. The cal-mag ratio is perfect, but low. Add a high quality cal-mag supplement like Growmore Flowering Cal-Mag if you run into issues. The sulfur is low to get it into one bottle as a 1-part fertilizer, so if you have any other issues or have hard tap water, use a high quality fulvic acid like Mr. Fulvic.
It works well. Give it a try!