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This issue's cover: The Sprengel-Liebig gold medal was created in 1955 by the Association of German Agricultural Experimental and Research Stations (VDLUFA) to acknowledge outstanding achievements in or services to agriculture, and with which pioneering scientists Carl Sprengel and Justus von Liebig are recognized and commemorated. See "On the origin of the theory of mineral nutrition of plants and the law of the minimum," by R.R. van der Ploeg, W. Bohm, and M.B. Kirkham, p. 1055-1062 [this issue]. Medal courtesy of Prof. Dr. G. Schilling, Martin Luther University, Halle-Wittenberg, Germany.