I got this fertilizer named Sensistar NPK ( 5-12-15 ) . Did someone ever use it ?? How to use it ?? It says : 1.3 ml per liter that means 1.3 l per 1000 liter , what i don't understand is how to use this Sensistar B ( bloom ) , it says down 1 sprinkle out 2 or 3 with water , what does it means and should I use a backpack sprayer or watering using drippers ?