Which is best?

how much your plants yield depends on the conditions. If you provide adquate conditions you'll have a decent yield, potency and taste as well. You might be getting sun all day in the desert lol sun is good. Might be a bit dry, if you want your plants to survive I suggest digging your holes deeper rather than wider, the roots should find it comfortable deeper inground. Lining you hole with plastic? never heard of that I think in the desert it would be better to let your roots roam free in search of moisture, just my thinking. Mulching the top of your hole should help keep your rootball moist. Pay attention to your plants, check them as often as you can to see how they respond to the torrid heat. mulch my good man. I wish I could grow that far south.

 

Sounds like your plan may fly as long as you can keep them watered. It's worth a try, maybe you'll be the guy with the next big breakthrough for desert growing! As far as how much you'll produce, there is no telling until you try, but for that long of a harvest, if all goes well, I'd guess maybe a 1/2 lb per plant if they end up getting really big (5 or 6 ft) and healthy.

 

mulch is something used to cover the tops of your holes, to retain moisture. It could be anything that doesn't allow moisture to pass through easily. Just make sure it doesn't stick out like a sore thumb. Don't use plastic or anything like that - grass clippings, more sticks on top of that, anything natural like surrounding vegatation. you want it natural looking because you don't want your holes to be noticable from the air, popo come down and snatch it like a eagle.

i just told you lol. i suggest you do more reading

 

buying soil from the store would help. just make sure there are no time released fertilizers (chemical). the bought soil should be pH balanced and preferably organic.

 

all da questions... how often you water your plants depends, could be 2 days or 2 weeks. Here up north it doesn't get that hot, I could go 2 weeks between waterings, I didn't even mulch never have, just read about it and think I will try these moves next year.
Plants can take a good dose of fertilizer at about 3 weeks into growth, easy on the nutes though don't wanna make them sick. try no more than half strength dosage to start off. If you can find organic ammendments to go into the soil you wouldn't need to water with fertilizers, you would just need to water. Always look for organic ferts / ammendments.
Lots of sunlight is the main factor for lots o potent buds, and taking good care of your plants.

 

yes organic equals better buds. plus you don't wanna be stuffing the earth full of chemicals. if you grow outdoors it should always be organic, leave the synthetics to hydro lords.
what kinds of nutrients you wanna use is up to you, there are so many ways to do it, but it's so simple. look it up somewhere.

 

glad I could help as much as I could. I did my first o/d grow just this past year, and before that 3 indoor grows, so it was a smooth transition. If this really is your first time, like I said before, more reading would help.
If you could get a spot that gets sunshine all day (the more the better) and feed it right, you'll be permagrin come harvest. Any more Q's I like to help the fellow novice growers out.