Job design, team building and employer reputation are the key ingredients. Managers are the builders. Their focus should be employees. You can design jobs with employees in mind. Uninteresting or boring jobs will cause problems.
Employers can capitalize on employees' interests and the advantages they see in farm work.
People who love animals are motivated by the opportunity to work with animals. Jobs emphasizing animals attract such people. Some people like machinery much more than animals. Some enjoy repairing machinery more than operating it. Managers have the primary responsibility for designing jobs.