C. C. Shock, Seddigh, M., Saunders, L. D., Stieber, T. D., and Miller, J. G.,
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Agronomy Journal, vol. 92, no. 1, p. 10, 2000.
C. C. Shock, Feibert, E. B. G., Saunders, L. D., and Klauzer, J.,
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Agronomy Journal, vol. 99, no. 4, p. 992, 2007.