im giong to be planting an alfalfa plot here in the next week or so, and we only have so much, but i can always buy more if need be, but i was wondering what would be the ideal size of a plot for a herd of deer that is probably about 10-12 deer in size. (i now have enough for about half an acre)

Based on what I've seen, with a good lush stand, up to an acre would take care of those deer easily. I would however stick a "cage" in the middle of the plot to monitor usage and browse level. Good luck with your management goals.

IT ALL DEPENDS ON THE NATURAL BROWSE THAT THE DEER HAVE IN YOUR AREA. IF THERE IS A LOT OF NATURAL STUFF FOR THE DEER IE, ACORNS, NATURAL CLOVER FIELDS AND SUCH. YOUR DEER PROBABLY WON'T WEAR THAT SIZE OF A PLOT DOWN. BUT ON THE OTHER HAND IF THERE ISN'T A LOT OF FOOD THEY WILL MOW IT DOWN LIKE A TORO.