Mixing Fertilizers

hey everyone,need some help please...So veg phase needsnitrogen, flowerigneeds phosph.right?if i got miracle grow(15-13-12)1 tsp per litre as it says. OrganicLawn food(12-3-6)1tsp per litre as it says.does mixing give me a total of N-P-K of 27-16-18??I also read that molasses is very useful for the root system using micro organisms so would adding fertilizer to a mix of molasses and water that been left to ferment for 48 hours kill the micro organisms in the molasses?I got my hands on a strain called purple wheelchair but cant seem to find anything about it. Does anyone know about it? all i know is its a heavy indica First time grower here.Please help!
 
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