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Differential Response of Navy Beans (Phaseolus vulgaris L.) to Zinc. I. Differential Growth and Elemental Composition at Excessive Zn Levels¹

Saginaw and Sanilac navy beans (Phaseolus vulgaris) were grown at various combinations of high and normal levels of Zn, Cu, Fe, and Mn in sand culture. Saginaw variety grew normally at 5.0 ppm Zn, while the growth of Sanilac was extremely reduced. This difference was manifested in plant height, leaf number, and root and shoot weight. In addition, a differential Fe.Cu interaction induced by high Cu levels was observed.

These differences apparently were not related to differential uptake or distribution of the nutrients, since the differences in elemental composition of the two varieties did not seem to be of sufficient magnitude to be biologically significant.

The Saginaw-Sanilac nutrient interaction relationship is proposed as a valuable system for the study of nutrient utilization since these two varieties differ in their tolerance to high as well as low levels of Zn and other unbalanced micronutrient conditions.

Key Words: Zn toxicity • Micronutrient unbalance • Navy beans

² Formerly graduate assistant in Department of Crop Science, Michigan State University (presently Assistant Professor, Department of Agronomy and Plaut Genetics, University of Minnesota, St. Paul, Minu. 55101) and Professor, Department of Crop and Soil Sciences, Michigan State University.

Received for publication August 6, 1969.

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