This little video might help ... scroll about half way thru to avoid all the "cute" chatter. This device might help scare deer ... has benefit of being portable so can change placing to keep deer from learning where it is and going around it.

Depending on how large an area you want to protect ... maybe put poles every so often in the field with a noise maker ... or battery light source, or ?... sort of scare crow?

Here is a link that might be useful: Deer repellent

Another video that might prove helpful. Recipe to spray on plants. Might be worth a try.

Here is a link that might be useful: Deer repellent recipe