Olafhenny
Were i live its is difficult to buy fertilizers because I stay in a remote area.
In South Africa in general i have not been able to find 10

10 or 19:19:19, or any balanced fertilizer, after months of searching. Best I can get is 3:1:5 or 3:2:3 etc. So I have been thinking of buying bulk bags from a farmers co op and mixing my own. For example the local farmers co op has Potash and ammonium sulphate & Potassium sulfate in 25kg bags, I just don't know how to combine them. Would mind you sharing what you mix, i.e. what are the bulk N:P:K products you mix.
Also are you mixing granular or water soluble?
what is the source of the 0-45-0 ? And what would be a N source (e.g. 40-0-0 )?