Wild Harvest.

Joe is the head of an itinerant combine crew, working the harvests against rival crew boss Alperson. Joe's buddy Jim joins the crew with startup money. Farmer's niece Fay falls for Joe. He puts her off. To get back she marries Jim whom she prods into high-grading the grain (skimming off some for private sale). The last payment on Joe's machinery is due just as he discover's what his buddy has been doing.