As far as I know, boosting hemp's THC content has a detrimental effect on it's use as fiber - and inversely selectign for high fiber will ower the THC. Temperature seems to have similar effects, teh warmer the climate, the more THC and les fibers you get.
I'm also sceptical about bio-diesel : you need oil-producing plants to do that and I don't think hemp is the best plant fo that. colza and the like ar far better in that regard, though in post-nuclear conditions, with little fertilizers and pesticides , you might be betfer off with a low productivity-low maintenance plant like hemp than with colza or sunflower.
One advantage is that if you're brewing some cellulose-based alcohol, an oil-producing plant will let you fuel both diesel (the oil) and gasoline (the alchohol)engines.
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