I think he left out the "per acre" part on accident...LOL. He's being conservative.

http://www.hemphasis.net/Economy/goodfarmchoice.htm

A good yield is about 800-900 lbs an acre, but average yields of 500-600 lbs. are more common.

Cap Greybeard's post had estimate of 8k lbs per acre. That's farfetched but
hell, if it's true, cha ching$$$

Greybeard's post.

http://investorshangout.com/post/view?id=1900916

http://www.fibrealternatives.com/hemp%20is%20...mConde.pdf