it is possible to get 1 pound a plant but probably not on your first few grows. the most important things for a large yield are
high yiellding strain such as critical mass
alot of light
long veg time
huge root mass.
i achieve over 2 pounds per plant by doing the following
veg for 8 weeks with topping
30 gal pots with coco feeding 4 times a day
2 600hps watts above each plant and 1 MH on either side of each plant.
useing the whole canna line up.
hope this helps