Tell welders to be safe and wear eye-protective gear, and some of them will. Be more specific, and more will pay attention. Perhaps even better, show welders a slide, photo, or video of a person with a piece of slag in his or her eye. Effective safety training helps workers visualize the accident and put themselves in the place of the injured person. The real prospect of going blind or of having slag removed from the eye can be potent preventive medicine.
People forget fast, so keeping safe habits alive is a challenge.
Frequent meetings both inform workers about how to avoid injury and remind them of the farmer's commitment to safe practices. Seasonal meetings can be tailored to specific agricultural activities. It is useful to involve workers in safety meetings. Encourage them to ask questions and, if they don't, query them to test their understanding. Try to involve as many workers as possible.