The best ranking of Agriculture, Food, and Natural Resources careers from highest to lowest required degree is:
Veterinarian → Environmental Engineer → Nursery Manager → Landscaper
This ranking is based on the typical educational requirements for each profession, where a veterinarian usually requires a Doctor of Veterinary Medicine (DVM), an environmental engineer typically needs at least a bachelor's degree in engineering, a nursery manager often needs a bachelor's degree or equivalent experience, and a landscaper may only need a high school diploma or equivalent.