I love watching a buck work a scrape and then shooting him after he's freshened it. I typically never bother much with hunting over field scrapes except putting cameras on them to monitor the number and size of bucks in the area as an inventory tool. It also helps in determining when rut activity is picking up as you see more and varied bucks begin to work them. However, more recently over the last several years, we have had a significant increase in ag plantings (into the thousands of acres) on at least one of my private tracks we still have standing corn that is adjacent to woodlots. Bucks may and will work these "field scrapes" during daylight hours if there is standing corn. Also grape rows. I believe they provide the buck with enough security cover to potentially hunt over them. Open field scrapes; however, unless situated off of a point of cover coming out say in a fallow field with goldenrod and other security cover may be ok to hunt as well. But just open ag (like a cut hayfield etc.) I'm not relating to those to hunt over as those are hit after legal hunting hours.
Regardless of its location, the only scrapes I pay attention to are ones with a noticeable licking branch over it. Fields or otherwise. If there is a licking branch it is being used by several deer both does and bucks which adds to the scrape's importance in terms of a hunting strategy. I have added more and more vertical grape vines to many scrapes over the last several years as well and the deer relate to them in quick order. I will monitor these with a trail camera too. The ones I feel that will be used most based on location and proximity of cover. Sometimes I'm spot on, other times there are better ones.
The best setups I've found for hunting scrapes are as stated previously, are ones closest or closer to bedding cover and I like situating downwind of them or better yet, parallel wind to them within bow range at about the third week of October until about the first week or so of November. But as the rut peaks I've noticed bucks still relate to them but not as consistently. However, scrapes are relevant all year long in some way shape or form.
I would add more but I have to get back to work!!!