Meyers tells the story of his life on the farm, from the joys of playing in the hayloft as a boy to the steady pattern of chores. He describes the power of winter prairie winds, the excitement of building a fort in the woods, and the self-respect that comes from canning 120 quarts of tomatoes grown on your own land.

Meyers's father is the central figure that these memories revolve around. After his father's death, Meyers fills his shoes out of necessity, practicality, and respect. In doing so, he discovers that his father was a great teacher and that he is no longer a boy but a man. Perhaps the most moving passages in The Witness of Combines are filled with the simultaneous sadness and pride of growing up in response to death. Meyers recalls planting and harvesting the last crop, selling the family farm, and other stirring moments in a testament to his father, the family bond, and the value of hard work.