Oklahoma State University

Dr. Niels Maness

Niels O. Maness , Postharvest Physiology

Dr. Niels Maness
  • Niels O. Maness, Professor
  • Department of Horticulture & Landscape Architecture
  • 358 Agricultural Hall
  • Stillwater, OK 74078
  • Office Location: 337 Agricultural Hall
  • Phone Number: 405-744-5423
  • FAX Number: 405-744-9709




Agronomy, Oklahoma State University, Stillwater, OK 1987

Agronomy, Texas A & M University, College Station, TX 1983


Agronomy, Texas A & M University, College Station, TX 1980


Teaching Activities

  • HORT 5433, Postharvest Physiology taught in the fall, even years (2010).
  • HORT 5443, Basic Laboratory Experimentation taught in the fall, odd years (2011).
  • Advisement activities include undergraduate advisement and M.S. and Ph.D. chair and committee member.

Research Activities

Activities involve natural products and nutraceuticals; mechanisms involved in shelf life extension of horticultural products; processing technologies for adding value to horticultural commodities; new crops and crop improvement. Current projects involving nutraceuticals include capsaicinoids in peppers, lycopene from watermelon, thujone/camphor from sage and thymol/carvacrol from oregano. Shelf life extension projects include defining the mechanism of opalescence in pecans and evaluating technologies to prevent it. Processing technologies under development include filtration processing for lycopene segregation from watermelon and collaboration on a project to develop x-ray as a non-destructive means for pecan grading and sorting. New crops under investigation include sage and oregano, both targeted for nutraceutical processing. Associated cropping systems for these crops, and for mechanized watermelon harvest for lycopene production, are also under development. Crop improvement activities involve selection for specific nutraceutical production potential for peppers, sage and oregano. Development of integrated production, harvesting, postharvest handling and processing systems for horticultural crops is a focus of research activities.

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