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Robbins, C.W. and Carter, D.L. (1983) Selectivity Coefficients for Calcium-Magnesium-Sodium-Potassium Exchange in Eight Soils. Irrigation Science. 4(83):95-102.
Robbins, C.W. and Hansen, C.L. and Roginske, M.F. and Sorensen, D.L. (1996) Extractable Potassium and Soluble Calcium, Magnesium, Sodium, and Potassium in Two-Whey-Treated Calcareous Soils. Journal of Environment Quality. 25:791-795.
Robbins, C.W. and Mayland, H.F. (1993) Calcium, magnesium, and potassium uptake by crested wheatgrass grown on calcareous soils. Communications in Soil Science and Plant Analysis. 24(9&10):915-926.
Robbins, Charles W. (1984) Sodium Adsorption Ratio-Exchangeable Sodium Percentage Relationships in a High Potassium Saline-Sodic Soil. Irrigation Science. 5:173-179.
Westermann, D.T. and Jackson, T.L. and Moore, D.P. (1971) Effect of Potassium Salts on Extractable Soil Manganese. Soil Science Society of America Proceedings. 35(1):43-46.
Wortmann, C.S. and Dobermann, A.R. and Ferguson, R.B. and Hergert, G.W. and Shapiro, C.A. and Tarkalson, D.D. and Walters, D.T. (2009) High-yielding corn response to applied phosphorus, potassium, and sulfur in Nebraska. Agronomy Journal. 101(3):546-555.
Kresge, P.O. and Gavlak, R.G. and Custer, S.G. and Robbins, C.W. and Jacobsen, J.S. (1988) Identification and impact of excess soil potassium on crop and livestock nutrition. In: Proceedings, 39th Annual Far West Regional Fertilizer Conf. USA-MT-Bozeman, 1988/07/11-13. 5 pp.
Westermann, D.T. and Tindall, T.A. (1997) Potassium considerations for southern Idaho soils. pp. 172-181. In: Tindall, Terry A. and Westermann, Dale (eds.) Proc. Western Nutrient Management Conf. USA-UT-Salt Lake City, 1997/03/06-07. Published for WNNC by Univ. of Idaho.