npk values read

  1. M

    How to read this NPK info?

    N: 1.5 ±50% P2O5: 0.5 ±50% K2O: 1.0 ±50% I have no idea how to read this. Any ideas? 1,5 - 0,5 - 1,0 i guess? So if there's so little of good stuff, how comes it works so well? I have stuff growing in it and no nutes for three months - no deficiencies on any kind.