It would be extremely expensive to get pure of any of the 3 fertilizer products. Like, insanely expensive.
Most fertilizer is a blend of 4 major common products. these are cheap and easy to produce.
Urea Map Dap Potash
Oh, also some ammonia combinations too, such as ammonia sulfate gives some sulfur which most areas need now that we dont have acid rain.
None of them is pure. Most are created with some sort of salt solution to extract the element we want. The final salt percent is low, but there is lots of other inert stuff left in them.
This is very general and looking at granular fertilizer, whole lot of details to be more accurate I know.
It is very rare for a 19-19-19 to supply what exactly your crop needs. Its best to get a soil test, anyhow once every 4 years or so, and then feed the ground what is lacking for the crop and yield you need. Some dirt is high in one thing, and to add more of it creates an imbalance that the plants dont take up the other products well either. It has its place once you know where you are at, and if you are in lower yielding areas or crops. Usually tho you need a lot more of one product for a great crop, and should do a custom blend to level your soil up into a good balance.
Its time for me to grind sample again, half the farm is due, and I think the other half is a couple years past due..... dang time passes......
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