Spuds, I would guess 400-450 sq ft. leaving luxurious row space.

For weeds, my weapon of choice is a swoe.

http://www.whiteflowerfarm.com/57700-product.html

They are manufactured by Wilkinson Sword Company. It works super fast, no mulch required. I maintain giant gardens with this one tool. I have over 10 acres of landscaped yard.