How we cite our quotes: (Line)
Quote #1
His shoulders globed like a full sail strung
Between the shafts and the furrow.
The horse strained at his clicking tongue. (2-4)
You can see the physical effort the father is giving by his domed shoulders; even the horse is working his tail off. He's got to be one strong dude to have shoulders that huge, too.
Quote #2
An expert. He would set the wing
And fit the bright steel-pointed sock. (5-6)
Not only is he strong, but he's skilled, an expert with the plowing equipment. You can't have one without the other, it seems. The consonance of those T sounds gives the line a neat and exact feeling, which is perfect to show us how expert el padre was.
Quote #3
The sod rolled over without breaking. (7)
This line attests to the father's skill and strength; you have to have a pretty delicate touch to plow through the ground without breaking it. It's like being able to fell a giant oak tree then whittle it into a perfect sculpture. There's no limit to this guy's awesomeness.