How to prevent unintended contamination of liquid fertilizers

When working with liquid fertilizers, the fertilizers get in contact with each other both intended or unintended. This could cause a reaction. When fertilizers are brought into contact with each other intendedly, this is called intended contamination. An example is the fertilizer recipe. Two fertilizers getting in contact with each other, does not necessarily result in a reaction. 
On the contrary, fertilizers can get contact with each other unintendedly. This is called unintended contamination and can happen when for example undiluted acidic and lye products are mixed. 

Calcium Nitrate (CN)
Ammonium Nitrate (AN)
Magnesium Sulphate (MSN)
Magnesium Nitrate (MN)
Calcium Chloride (CC)
Potassium Sulphuric Acid(KZZ)
Nitric Acid (SZ-38)
Phosphoric Acid (FZ-59)

Potassium Phosphorus Hydroxide (KFL)
Potassium Hydroxide (KL-50)
Silicon (SiL)
Potassium Carbonate (KBL)

Reactions of liquid fertilizers

Mixing liquid fertilizers can happen on purpose or accidentally. These fertilizers already form a risk in the storage stage. Also, keep in mind that during transport and the creation of the fertilizer recipe, the fertilizers should be handled with care. Always take into account your own safety while doing this!

Risks during transport

Transporting liquid AR-fertilizers always happens under strict safety measures. Despite these measures, things can go wrong during the transportation. A fertilizer can be pumped into the wrong pipe, which could lead to vaporization or the development of heat, with harmful consequences. These risks can be reduced by making use of end-key valves

Risks during storage

During storage of the liquid fertilizers, the safety regulations should be watched carefully. It is crucial to make use of the correct dripping tray, and that acidic and lye products are separated in different dripping trays. 

Risks while making the fertilizer recipe

Some products should not react with each other in undiluted forms, to prevent precipitation, gas or the development of heat. In order to prevent contact of several elements, use of the A- and B-tanks can be made. The table included below explains which two concentrated, undiluted fertilizers can get in contact with each other:

Carbonate (KBL)
Sulphuric Acid
Ammonium Nitrate   N, GN, GN, G     N, G 
Calcium Nitrate  NNNN N N NN
Potassium Phosphorus HydroxideN, GN   N, WNNWN, WN  
Potassium HydroxideN, GN  N, WNNN, WN, WN  
Potassium CarbonateN, GN   N, WNNN, WN, WN  
Potassium Sulphuric Acid NN, WN, WN, W NN N N, W 
Magnesium Nitrate  NNNN   NNNN
Magnesium Sulphate
Nitric Acid  N, WN, WN, W      N, W 
Phosphoric Acid NN, WN, WN, WNNN   N, W 
Potassium Chloride  NNN NN   
SiliconN, GN   N, WNNN, WN, WN  
Potassium Phosphite N    NN     

N= Precipitation
W= Heat development
G= Gas formation

Note: If fertilizers of category G and W mix, immediately leave the room! 

If liquid fertilisers in category G and W have come together, leave the room immediately, call 112 or 911 and inform the fire brigade which products have come together.

Precipitated product is guaranteed loss of quality. Discuss with your crop care product specialist whether the precipitated end product can still be used, or needs to be emptied.

Product specialistsAny questions about unintended contamination of liquid fertilizers?

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