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In this video we are teaching when and why to use the two most common NPK formulas available on the market. Please note that these are chemical fertilizers and should not be used if you want a 100% organic garden. Follow our videos on other social networks: Blog: http://pomaremvasos.blogspot.com.br/ Facebook: / pomarehortaemvasos Youtube: / @pomarehortaemvasos Google+: https://plus.google.com/u/0/communiti...