If it were a full allotment plot (most are 1/2, 1/3 or 1/4 plots these day) then it's possible, with successional sowing.
For example, you could easily get a couple of hundred pounds of potatoes out of a single bed. I've got 15 raspberry plants in a relatively small space. They can average 10lb fruit per plant over a season.
Add in some of the heavier crops (e.g. pumpkins and squash) and the 1642lbs looms ever closer...