Beginner Gardening: maple summer yellowing, 2 by rfkmichman

rfkmichman wrote:
Attached are several photos of leaves in various stages of the issue. The worst looking leaf is the same leaf I photographed yesterday in the original post (it was still--barely--hanging on). There are certainly several surface roots and the soil is dusty-dry. the screwdriver went into the soil, but not because of moisture, but because we have a sandy/dusty soil here. We have had two to three weeks with 95-100 degree temperatures and no rain for about a 3 weeks. There was one big rain then, and it was about 2 weeks of no rain before that (though unseasonably cool, 80-85). My first guesses would be lack of water or nutrients. But I need to know what nutrient or if its a disease. We also have a lawn service fertilize our lawn. The bare grass spots are significantly larger than they were last year.