Incorporating tillage effects into a soybean model von Andales, A.A., Batchelor, W.D., Anderson, C.E., Farnham, D.E., Whigham, D.K.

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Effectiveness of supplemental instructional materials for students differing in farm experience [PLANTS: Personalized Learning and Narrated Tutorial System, Iowa State University,... von Poland, S.M, Williams, D.L, Whigham, D.K, Mullen, R.E

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Factors affecting student performance in one unit of a crop production course von Poland, S.M, Whigham, D.K, Bramel, P.J, Mullen, R.E

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Costs of producing clonal offspring and the effects of plant size on population dynamics of the woodland herb Uvularia perfoliata (Liliaceae) von Wijesinghe, D.K, Whigham, D.F

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