Supplemental feeding can be a useful tool for landowners to improve their deer habitat and increase carrying capacity. Especially if supplemental feeding is provided during stressful times of the year. The most stressful time for Whitetail Deer are winter and late summer.
Attached are plans for simple gravity feeders made of PVC pipe. These plans could be used by students with Wildlife or ENR SAE projects and as Agri-Science Fair projects. 
W. Justin Sealy
Area Forestry Teacher
South Region Ag Ed