Final answer:
Aerial perspective is the monocular cue described in the question, where objects farther away appear less distinct and have a bluish or hazy appearance.
Step-by-step explanation:
The monocular cue described in the question is called aerial perspective. Aerial perspective refers to the phenomenon where objects that are farther away appear less distinct and have a bluish or hazy appearance. In the example given, the wheat stalks near the road are visible and distinctive, but as they recede into the distance, they blend into a smooth blanket of yellow, exhibiting the effects of aerial perspective. Objects farther away appear to be less detailed, have less contrast, and may take on a bluish tint due to the scattering of light by the atmosphere. In this case, the blending of wheat stalks in the distance is a result of the atmospheric effects on their appearance.