Can I mix fish fertilizer with 17-17-17 without burn?

[Palmfarmer]

Just fertilzed all my palm with a powder fish fertilizer that is 9.5-4-0.5, but more importantly full of micronutrients. I noticed that the fish fert is low in potasium. So I am wondering if i Could add some 17-17-17 syntetic all porpuse fertilizer without burning my palms. Thanks.

[Looking Glass]

You could just add 0-0-60 potash, though it may not be controlled release.  You might want to balance Mg with it.  Or just think of it the other way around, fertilize the palm with whatever fertilizer fits, and supplement with the fish fertilizer for extra N and micros. 

I excessively fertilize everything for sure, and I’ve never had a problem burning a palm, for what that’s worth.