Responsibilities and Interests:

Climate, physiographic and soil variation combine to influence plant fitness and the performance of management practices. My interests lay in assessing cause and extent of such variation on cropping systems performance broadly. I am trained as an applied plant ecologist and have spent most of my plant science life studying aspects of weed ecology with a particular interest in seeing ways such studies would directly benefit farmers through enhancing production efficiency while at the same time identifying practices that offer enhanced environmental protection.

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Education:

• B.S., Botany Department, Drew University, 1978
• M.S., Physiological Ecology, Duke University, 1983
• Ph.D., Department of Crop Science/Minor: Soil Science, North Carolina State University, 1987

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Selected Publications:

1. Burton, M.G., D.A. Mortensen, D.B. Marx, and J.L. Lindquist. Niche effects on wild Helianthus annuus L. maize (Zea Mays L.): Seed germination, emergence and survival. Weed Science. (Accepted for publication.)
2. Mortensen, D.A., J.A. Dieleman, and M.M. Williams. Using remote sensing in integrated weed management: what do we need to see? Agron. Journal. (In press.)
3. Padbury, G., S. Waltman, J. Caprio, G. Coen, S. McGinn, D.A. Mortensen, G. Nielsen, and R. Sinclair. 2002. Agroecosystems and land resources of the Northern Great Plains. Agron. J. 94: 251-261. Abstract.
4. Dille, A.J., M. Milner, J.J. Groeteke, D.A. Mortensen, and M.M. Williams. How good is your weed map? A comparison of spatial interpolators. Weed Technology. (In press.)
5. Williams, M.M., D.A. Mortensen, A.R. Martin, and D.B. Marx. 2001. Within-field soil heterogeneity effects on herbicide-mediated crop injury and weed biomass. Weed Science 49:798-805.
6. Williams, M.M. and D.A. Mortensen. 2000. Crop/Weed Outcomes from site-specific and uniform soil-applied herbicide applications. 2:377-388 Precision Agriculture 2:377-388.
7. Williams, M.M., R. Gerhards and D.A. Mortensen. 2000. Two-year weed seedling population responses to a post-emergent method of site-specific weed management. Precision Agriculture 2:247-263.
8. Mortensen, D.A., L. Bastiaans, and M. Sattin. 1999. The role of ecology in developing weed management systems: an update. Weed Res. In press.
9. Mortensen, D.A., J.A. Dieleman and M.M. Williams. 1999. Using remote sensing in integrated weed management: What do we need to see? Agron. J. In press.
10. Dieleman, J.A., D.A. Mortensen, and A.R. Martin. 1999. Influence of velvetleaf (Abutilon theophrasti) and common sunflower (Helianthus annuus) density variation on weed management outcomes. Weed Sci. 47:81-89. Abstract.
11. Lindquist, J.L. and D.A. Mortensen. 1998. Ecophysiological characteristics of four maize hybrids and velvetleaf (Abutilon theophrasti). Weed Res. In press. (J. Series No. 12018)
12. Mortensen, D.A. and J.A. Dieleman. 1998. Why weed patches persist: dynamics of edges and density, p. 14-19. In: R.W. Medd and J.E. Pratley (eds.), Precision Weed Management in Crops and Pastures. R.G. and F.J. Richardson, Melbourne.
13. Lindquist, J.L., D.A. Mortensen, and B.E. Johnson. 1998. Mechanisms of corn tolerance and velvetleaf suppressive ability. Agron. Journal 90:787-792. (J. Series No. 12034) Abstract.
14. Mortensen, D.A., J.A. Dieleman, and G.A. Johnson. 1998. Weed spatial variation and weed management, p. 293-309. In: J.L. Hatfield, D.D. Buhler, and B.A. Stewart (eds.), Integrated Weed and Soil Management. Ann Arbor Press, Inc., Chelsea, MI.
15. National Research Council Report. 1997. Precision Agriculture in the 21st Century: Geospatial and Information Technologies in Crop Management, p 118. National Academy Press, Washington, D.C. Report released by the National Academy of Science in September, 1997. Served as panel member and co-author of this peer-reviewed report.
16. Williams II, M.M., D.A. Mortensen, and J.W. Doran. 1998. Assessment of weed and crop fitness in cover crop residues for integrated weed management. Weed Sci. 46:595-603. (J. Series No. 12028) Abstract.
17. Teo-Sherrell, C., D.A. Mortensen, and M.E. Keaton. 1996. Fates of weed seeds in soil: A seeded-core method of study. J. Appl. Ecol. 33:1107-1113. (J. Series No. 10833)