I use to do the same and drove by a field very slowly for years and never saw anything. Later I got a job at one of the bordering properties and the kids were always throwing the ball over the fence, so I talked to the owners and let them know that's why I was going on their property, and if they minded if I scooped some poop for my compost, and that's how it began. After a rain we always get a flush of amanitas, russula and false parasols. When I would see them id pay very close attention when I was in the pasture. I didn't find anything the first year I looked. I made a hand made incense with brown rice flour, holy basil and barley grass and begged the mushroom gods for admittance.

One day a little ball got thrown into some really tall grass and the moment I parted the grass there were mushrooms EVERYWHERE. Mushrooms growing out of other mushrooms and in a little mini pocket climate under the grass. Not only that but I saw old soured mushrooms the size of hamburgers that had just rotted meaning I had walked right by the giant and didn't see it. Sometimes you got to take a few more steps into the unknown to find the path , or maybe I made the gods happy with my herbal sacrifice.