[ A slightly faded photo of a dozen or so people bent down in a deep yellow field of cut wheat, picking up stray stalks of wheat where the mechanized harvester has left the field looking prickly up close, and striped from farther away. To the left of the group, the wheat stands tall, uniform, and unharvested. In the distance, soft-looking hills sit beneath a blue-grey sky. ]
You're right, I think of all his paintings of farm workers, its most similar to The Red Vineyard in Arles but like you said there are quite a few.
Farm workers and peasant life became a fairly popular topic for artists mid 19th to early 20th century, as popular culture moved away from the idealistic art of flowery Rococo portraits to realism, and then to impressionism (with other isms in between of course).