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Ronald Valke

How to calculate NPK formulae
Growers sometimes ask me how come that potassium nitrate 13-0-46 = 59% and not 100%. Let’s start...
Manganese - a problem or not?
In my last blog I talked about the different kind of chelates that are on the market and what the...
What is the best chelate for your situation!
In my first blog I talked about pH control. pH control is very important for the uptake off...
Fertilisation is more than adding fertilizers!
With the free available Haifast software it’s very easy to make a good calculation for the...