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Udo Blum

Professor Emeritus


Gardner Hall 2113


Area(s) of Expertise

Allelopathy – Characterizing and identifying the mechanisms by which allelopathic compounds, specifically phenolic acids (e.g., ferulic acid, p-coumaric acid, vanillic acid, p-hydroxybenzoic acid), released into the soil environment may impact soil chemistry, soil microbiology, rhizosphere ecology and population biology and physiology of dicot weeds in no-till agroecosystems.

Air Pollution Biology – Effects of ozone on legumes and fescue and ladino clover forage systems.

Salt Marsh Biology – Environmental effects on Spartina alterniflora (smooth cordgrass) and carbon and energy budgets of Spartina alterniflora salt marshes in Brunswick County, NC.

Selected Publications


Blum, U. 2019. Plant-plant allelopathic interactions III. Partitioning and seedling effects of phenolic acids as related to their physicochemical and conditional properties. Springer Science Business Media, Cham. 503 pages

Blum, U. 2014. Plant-plant allelopathic interactions II. Laboratory bioassays for water-soluble compounds with an emphasis on phenolic acids. Springer Science Business Media, Cham. 322 pages.

Blum, U. 2011. Plant-plant allelopathic interactions. Phenolic acids, cover crops and weed emergence. Springer Science Business Media, Dordrecht. 200 pages.

Blum, U., Shafer, S. R., and Lehman, M. E. 1999. Evidence for inhibitory allelopathic interactions involving phenolic acids in field soils: Concepts vs. an experimental model. Critical Reviews in Plant Sciences 18:673-693.

Blum, U., King, L. D., Gerig, T. M., Lehman, M. E., and Worsham A. D. 1997. Effects of clover and small grain cover crops and tillage techniques on seedling emergence of some dicotyledonous weed species. Amer. J. Alternative Agriculture. 12:146-161.

Air Pollution Biology

Rebbeck, J., Blum, U., and Heagle, A. S. 1988. Effects of ozone on the regrowth and energy reserves of a ladino clover-tall fescue pasture. J. Applied Ecol. 25:659-681.

Montes, R. A., Blum, U., Heagle, A. S., and Volk, R. J. 1983. The effects of ozone and nitrogen fertilizer on tall fesuce, ladino clover, and a fescue-clover mixture. II. Nitrogen content and fixation. Can. J. Bot. 61:2159-2168.

Blum, U., and Heck, W. W. 1980. Effects of acute ozone exposures on snap bean at various stages of its life cycle. Environ. Exp. Bot. 20:73-85.

Kochhar, M., Blum, U., and Reinert, R. A. 1980. Effects of O3 and (or) fescue on ladino clover: interactions. Can. J. Bot. 58:241-249.

Blum, U., and Tingey, D. T. 1977. A study of the potential ways in which ozone could reduce root growth and nodulation of soybean. Atmospheric Environ. 11:737-739.

Letchworth, M. B., and Blum, U. 1977. Effects of acute ozone exposure on growth, nodulation and nitrogen content of ladino clover. Environ. Pollut. 14:303-312.

Tingey, D. T., and Blum, U. 1973. Effects of ozone on soybean nodules. J. Environ. Qual. 2:341-342.

Salt Marsh Biology

Booker, F. L., Seneca, E. D., and Blum, U. 1989. Effects of weathered fuel oil on solute leakage, respiration and plasmolysis in excised root sections of Spartina alterniflora Loisel. and Limonium carolinianum (Walt.). Britt. Environ. Expt. Bot. 29:249-259.

Seneca, E. D., and Blum, U. 1984. Response to photoperiod and temperature by Spartina alterniflora (Poaceae) from North Carolina and Spartina foliosa from California. Amer. J. Bot. 71:91-99.

Cammen, L. M., Blum, U., Seneca, E. L., and Stroud, L. M. 1982. Energy flow in a North Carolina salt marsh: A synthesis of experimental and published data. ASB. Bulletin 29:111-134.

Linthurst, R. A., and Blum, U. 1981. Growth modification of Spartina alterniflora Loisel. by the interaction of pH and salinity under controlled conditions. J. Exp. Mar. Biol. Ecol. 55:207-218.

Blum, U., Seneca, E. D., and Stroud, L. M. 1978. Photosynthesis and respiration of Spartina and Juncus salt marshes in North Carolina: Some models. Estuaries 1:228-238.


Ph.D. Botany University of Oklahoma 1968

M.A. Botany Indiana University 1965

B.A. Biology Franklin College 1963