Question

Four method to prevent rusting of iron

Answer 1

coat it with soil .
paint it .
other considerations.
bacteria warning.

Answer 2

Paint It. Paint the bare metal with any durable acrylic paint.
Keep Moisture at Bay. Avoid contact with water or moisture.
Coat It With Oil. Use of oil or grease significantly reduces the chances of developing rust in iron.
Other Considerations. Use stainless steel wherever and whenever possible.
Bacteria Warning.