Denofearth69 has a very good point, and for anyone skeptical of adding fertilizers to your soil, organic teas are the way to go. Overfertilizing isn't such an issue, nor is pH balance. I've grown in soil w/ Fox Farm's trio many times...and Fox Farm's trio can not hold a candle to the yield I get w/ my organic tea. I'd drop my copy and paste below for anyone interested.
What you'll need:
Seabird guano, bat guano, earth worm castings, kelp meal (or liquid seaweed), molessas, a bubble stone and bubble pump, a paint strainer. 5 gallon bucket.
What to do:
Get a couple of gallons of water from tap....let set on bubbles over night to dechlorinize it, then pH balance the water to 6.5....take a couple tablespoons of each (worm castings, seabird, bat, kelp, molessas) and put inside paint strainer and tie shut...hang the mix over the bubble stone to make movement/activity in the water....let set for 24-48 hours....put 2 cups of this per gallon to new dechlorinized pH balanced water, then water in once weekly.
...you'll want to back up off of the earthworm castings and the seabird guano in mid flower to eliminate nitrogen avalibility.
...the molessas and liquid seaweed are liquid , however, still use table spoon measurements.
...stop giving tea @ weeks 5 for an 8 week strain, or allow a couple weeks to leach/flush (not so important organically but, I prefer to save the $)