bird nest in native grasses in the corner of the field

[dognose]

No trees around, so I don't think its a fallen nest. I've come across small killdeer nests in the corn fields when relic hunting.

 

[Red-Coat]

Multiple possibilities of course, but I would say the construction of the nest and its location are very typical for a song sparrow (Melospiza melodia).

 

[ToddsPoint]

Meadowlark.