How can fertilizer tanks be prepared?

Preparing fertilizer tanks
Written by Han van der Kooij | Last update: 22-09-2020

Preparing fertilizer tanks requires close attention. Mistakes in this preparation can cause many problems. Calculating an optimal nutrition feeding scheme is an important aspect in horticulture. Our specialist explains the preparation of fertilizer tanks in this article.



The difference between A- and B- fertilizer tanks

Two fertilizer tanks are developed in order to prevent undesired reactions of certain elements. After the A- and B-tanks have been prepared, the solutions come together in a special tank, the mixing tank. The mixing tank contains a concentration that is eventually given to the crop. Due to this mixing tank, the chances on the elements precipitating are reduced.


A-tankB-tank
Calcium Nitrate 
Magnesium Nitrate
Ammonium Nitrate
Calcium Chloride
Iron chelate 



Nitric Acid
Sulphuric Acid
Phosphoric Acid
Potassium Phosphorous Hydroxide
Potassium Hydroxide
Magnesium Sulphate
Potassium Phosphite
Trace elements (sulphates and chelates, excluding iron chelate)


Note: Always make sure to make use of the personal protection prescribed, when preparing a fertilizer tank (special gloves, face protection and safety glasses). 



Preparing the A- fertilizer tank

  1. Fill the fertilizer tank up to approximately 20% with water 
  2. Dose the following fertilizing elements
    Liquid: Fertigro KL-50, Fertigro KBL
    Fixed: Potassium Nitrate
  3. Mix carefully
  4. Add more water to the tank, filling it to approximately 50%
  5. Measure the pH level of the solution. It should be below 5.5
    > 5.5: Correct with Nitric Acid
    < 5.5: Correct with Fertigro KL-50
  6. Dose the other fertilizer elements
    Liquid: Fertigro CN, AN, MN
    Fixed: Calcium Nitrate, Ammonium Nitrate, Magnesium Nitrate
  7. While mixing, the tank can be filled with water up to 100% 
  8. Measure the pH once again
  9. Add the iron chelate
  10. Mix well once again


pH minimumpH maximum
Fe-DTPA3,05,5
Fe-HEEDTA3,05,5
Fe-EDDHA4,05,5



Preparing the B- fertilizer tank

  1. Fill the fertilizer tank up with water to approximately 20%
  2. Dose the following fertilizing elements
    Liquid: Fertigro SZ-38, KZZ, FZ-59
    Fixed: Potassium Nitrate, MKP, MAP
  3. Mix carefully
  4. Add more water to the tank, filling it up to approximately 60%
  5. Measure the pH level of the solution. It should be below 5.5 and measured from top to bottom with a pH probe.
  6. Dose the other fertilizers
    Liquid: Fertigro MSN
    Fixed: Magnesium Sulphate
  7. While mixing, the tank can be filled with water up to 100%
  8. Dose the trace elements




More information about preparing fertilizer tanks

Do you have any questions about crop care, or do you want personal advice? Contact our product specialist Han van der Kooij by filling in the form below. We will then contact you as soon as possible. On working days within 24 hours. 





Han van der KooijAbout Han van der Kooij

Han van der Kooij, fertiliser product specialist at Royal Brinkman, understands the customer like no one else. After being a grower himself, for 26 years, he knows the ropes and is aware of what is involved in being a grower. Converting his own knowledge and experience into recommendations that are useful to growers, is what he likes best about his job. "Finding that this leads to good results, makes me quite satisfied."