Outdoor Grow 2015!!!! To bag or not to bag

So I've done the indoor thing for a while, and I'm getting ready for the outdoor business for next
year on a very very very large plot of land. My friend who owns the land is out getting pictures
but the first foot of the native soil is nice and black from years of vegetation dying.

We've done a soil sample with a local agricultural company and it is very fertile for "tomatoes" but
is a bit acidic, and gave us a list of optimal amendments per cubic ft. to add. They even will mix it
up for us so all we need to do is mix it up with our native soil.

We have a pretty large backhoe with a cubic yard bucket that we're using.
Water comes straight from a pretty large pond filled with microbial life.

Here's the question.....

We want to grow in-ground. At first we thought we wanted to do the 200 gallon smart pot above
ground for the air-pruning benefits but decided against it, mainly because of the possibility of
a fly over one day. It just seems smarter to put back the dirt we dig out instead of having
a crater in the ground from digging up soil to fill the smart pots with.

If we're going in ground for what we're hoping will grow into some rather large plants (we're vegging for 2-3 months indoors, we want big ass trees) should we still go with some pots or bag lining in the ground?

My friend seems to think we should be ok with just digging out the soil, mixing our amendments and putting it back in the ground. The dirt is pretty loose down to 8 feet before it starts to compact, so I'm thinking everything is going to drain away unless we bag it. But, if we don't bag it, we're not restricting the roots from growing as large as they want since the soil is loose enough for it to travel.

Any ideas/advice?
 
Like I said, we don't want grow above ground so we can replace the soil we dig out, not leaving any odd big empty
areas in the ground.
 
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