I recently bought 1 bag of bio maxx which is supposed to be good for 1 acre. however i am only planting about .5 an acre. Should i only use half the bag or should i go ahead and spread all the seed on this one area. thanks for any help.

Only plant half the bag unless you get a lot, and I mean a lot of rain. If it gets dry and you planted the whole bag,you will probably lose most of the ears of corn, and have few pods on the beans for winter food.