I have done most of my bowhunting from the ground over the last few years and killed a lot of deer doing it both does and bucks.
I really take no special precautions except playing the wind.One day I had a large buck coming down a fenceline with a doe.The doe was way in front and I had to let her pass to get the shot at the buck.There was a very small bush in the fenceline and I was behind it, all I could do was curl up as small as possible and hope she didnt notice me.
Long story short she came up and started eating leaves off the bush about 3 ft from where I was sitting and paid no attention to me, the buck on the other hand jumped the fence and came up behind me.He got about 20 yrds from me, stopped, and froze.He never seen me but he turned and more or less tip toed back the way he had come from.He had smelled something he didnt like.I never got a shot but it was a good lesson in deer behavior.
This was on heavily hunted public ground, the wind was blowing hard about 20mph in my face.The doe had to have smelled me because she was just that close, but it wasnt enough to alarm her as there was human scent all over the area.The buck however had barely got into where my scent stream shoulda been and although he didnt freak out and run he was leary enough to not come any closer and spent the rest of the evening about 150-200 yrds away chasing does.
Sometimes depending on the deer, the area and the wind you can get away with a lot, sometimes the slightest hint of smell will send them running away and no clothing, spray, or anything else is going to completely cover your odor up.Ive kiled deer from a few yards away on ground level, and I have had deer that shouldnt have smelled me react and run away so fast you are left scratching your head trying to figure out what happened.I will save my money for new broadheads and skip the scent protection personally