With an agriculture PhD, you could position yourself for careers in high levels, such as agriculture professors, CEOs or investors. Compared to a masters program in the field, this degree level focuses more on specializations in economics.
University of California - Davis
The M.S. degree is both an end in itself and a preparation for the Ph.D. degree. The Master's program includes courses emphasizing applications of economic theory and quantitative methods, along with elective field courses. It is usually completed in a...