the re-use of our soil

i was wondering if it is possible to have worms in your grow bed.

the reason for it would be to eat the roots of the previous grow.

so, this is my vision, finish a grow, remove as much as you can, supplement the soil again with nutes, bacteria and enzymes.
plant in the same soil again.

ok, let me extend this question.

to grow organically do you have to mix the dry nutes into the soil before you grow?
can you just use organic liquid nutes?
or a combination of both

what i dont understand is how do you give the plant the extra need p and k during aggressive flowering

if anyone is interested, i have found the answer to my own thread

thanks to everyone for their input
http://cannabis-world.org/cw/showthread.php?t=3099

yea..but you forgot one thing.
DO NOT FORGET TO USE a good salt leaching solution for your old soil to make sure all the old mineral deposits are gone so you dont burn your new plants.then re energize the old soil with your new additives.
i use AN iguana juice.i add some sensi 2 part to bump the EC up higher ..to 1400 ppm when i feed.about once a week.
as far as a soil amendment i have mixed moo doo compost .4 cubic ft of dirt 1 cubic foot of moo doo compost and 3 cubic ft of perlite.you can also throw in some bat guano .and worm castings.i prefer all organic soil amendments.
if you dont want to purchase all the seperate components of the ammendments fox farms makes a soil ammendment for under 20 dollars for 4 cubic ft .it is made up with microrize.bat guano and worm castings.some dirt.you would work that into your dirt.
i have found that i like a product caled maxicrop seaweed and fish concentrations..the fish in a two gallon bucket takes only two caps of their fish and two cap fulls of their seaweed to a ec level of 800 .i like it for my mothers and baby plants'good luck

if your using mostly organic things, and if you feed water only a week or two just before harvest
why would just feeding the new plants water for a little while not work?