buying nuts help

hello there, so was looking for nuts but here they got NPK 10 5 4 that what am using..was looking for npk20 20 20 but nada no product 20 20 20...they got NPK 28 6 4 and NP(2)K 11 52 05 they are not liquid but like small particles can i use these?or too strong? and what the 2 stand for? NP(2)K
Still in veg stage but what should i use for flowering? they only got these

alll of those are too high you want some were in the range of 4-2-5 not 20-20-20
your ganna burn umm if you use somehting that high

oupsss ok i thought the 20 20 20 would be better oupla.....
and any idea when flowering which one to use?