Please help

I am planning an outdoor grow next year and the soil i would be growing in is very questionable so I want to introduce some better soil to the location. Would it be a good idea to dig holes, line the holes with a big trash bag, make holes in the bottom of the bag for drainage, fill the bags with good soil, and plant the crop in the good soil?
or is there a better method of doing this? buckets seen like they would be harder but is it worth it? Suggestions?

Why do you need to put a trash bag or pot into the hole? Unless the soil that is already there is so bad it will mess with the new soil, I dont see why you can't just dig a hole and fill it with the dirt of your choice. But hey, I'm no expert.

I would just put the soil into the hole, unless you've got problems with varmints, and then a plastic bag won't do the trick. If you want to really get the soil going, try to get something with mycorrhizae onto it. By next growing season you would definitely see a difference.

I do know someone who does pretty much that, he posted what he does in Subcool's Organics I think. Ohsogreen.

^+ mycorrhizae will give u trees if added correctly

In spite of probably sounding stupid, what is mycorrhizae and where can you get it? Price?

it is a fungi that grows in or around the root system. The fungi and plant form a symbiotic relationship where the plant sees an increase in h20 uptake and nute uptake (especially phosphorous). The fungi gets food(sugar) from the plant.

not a stupid ? at all, most people dont know what it is.

Well that sounds like something that would REALLY help me out. Where do get it and how much does it cost?

not sure exactly where u could find it, i would try any large nurseries or any agriculture stores if your in that kind of area. online its anywhere from 15-50 dollars.
i think u just gotta look around.

It can be found already in mulches, composts, amended soils, and organic fertilizers. I have used Super Plant Tonic, by Blue Mountain Organics (find them only on Ebay), Dr. Earth Organic 5, and Fox Farms Happy Frog Japanese Maple (for flowering, don't make a tea out of this stuff, it stinks worse than rotten shit). If you use the fertilizers, which is what I would do, I'd probably use the Dr. Earth if you can find it, you just apply according to directions, sprinkling it over the soil and turning it in. If you get good rain during winter, leave it be. If not, water it a little bit, get it washed down in a little bit. Molasses feeds mycorrhizae, as mentioned above.

Mycorrhizae.

hauling a shite-load of soil to some back pack location isn't much fun... you might consider soil amendments also. ie; dolomite, fertilizer, etc.

"Mycorrhizae"? what's the difference between that and peet moss??

Mycorrhizae are a group of soil fungi, and peat moss is a... is moss a plant? Whatever it is, it doesn't do what soil microbes do, which is in large part to act as Agents of Chelation. What's chelation? It's a chemistry term that for most purposes means that the substance is more "bio-available". Check my link on the mycorrhizae, and be sure to look at the images, especially the before and after pix.