Is the fibre from hemp the same as the fibre from the medicinal varieties of cannabis? Can't they grow weed for its bud but also use the fibre for all the other uses? If so it sounds like win-win to me as there's little waste and maximizing profits.
Don't ask how I know the answer to this one, Pugsley!
'Hemp' is the fibre of the plant, which, in its original state, had little 'psychotropic' value. It has been human cultivation that has produced seeds that produce plants with v. high percentages of female plants, far far higher bud-to-overall-plant ratio, propensity to seedlessness, and the THC that gets ya stoned. If you take Extra Super Stoner Special pot seeds, and chuck 'em down on a river flat, and leave 'em grow wild for fifteen or twenty generations, they'll revert to bein' hemp.
So the answer to your question is: No, not really. You either lavish attention on the plants, which gives you smaller plants with lots of lovely heads -- but little of the fibrous bulk you need to make rope; or you grow the plants for size, thus bulk, thus fibre -- and the psychotropic value of the plant falls to almost nothing.
Anecdote: so anyway, it's 1984, and Mark and his Stoner Backpacker Entourage are on the Kidney-Bruiser All-Stops Bus to Dharamsala, in the top left hand corner of India, when we see 12-feet tall pot plants growing in the ditches on the side of the road. We pile out, and ecstatically stuff our shoulder bags full of it, to smoke later at the hotel.
Nah! No high. It's rope, and all ya get from smokin' it is a sore throat.