when using organic material for gardening ie. guano,and others do you add the n-p-k together(5-2-2 +10-1-1)?
February 28, 2010 by admin
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No.
The 3 numbers show you the quantity of each nutrient in the packet. They do not have to add up to any particular amount. You could have a fertiliser that was 10 8 12 or 4 20 0. It all depends what you are applying it to and when.
This site has tables (if you scroll down) showing you different fertilisers and the NPK values. Hope it helps.
http://www.powen.freeserve.co.uk/Basics/fertilisers.htm#fert