60 Seconds or Sow: What do 10-10-10 and NPK mean on Garden Fertilizer?

60 Seconds or Sow: What do 10-10-10 and NPK mean on Garden Fertilizer? 

Well not quite 60 seconds or so, but as fast as I could. I explain to you what numbers like 9-12-12 and 10-10-10 mean on garden fertilizer. I explain to you what N-P-K means as they are key vegetable garden macro nutrients

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