The School of Plant, Environmental & Soil Sciences offers graduate programs leading to the Master of Science (MS) and the Doctor of Philosophy (PhD) degrees. There are three optional areas of concentration within the degree programs: Agronomy, Horticulture, and Soil Science. Students interested in a particular concentration should contact a graduate advisor for specific requirements. Students with an agronomic focus concentrate their graduate studies in weed science, crop breeding and genetics/biotechnology, or applied plant physiology. Students studying horticulture may specialize in any branch of horticulture, including breeding and genetics, propagation, vegetable production, physiology, mineral nutrition, weed control, plant growth and development, postharvest physiology, and food processing. Students pursuing soil science study a wide variety of subdisciplines including soil classification, soil physics, soil chemistry, soil fertility, soil microbiology, environmental soil science, and land use/management.