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Further Evidence for a P-Zn Imbalance in Plants¹

ABSTRACT

Beans (Phaseolus vulgarus) and potatoes (Solanum tuberosum) were grown using a split-medium technique that permitted Zn to be supplied to the plants from a soil medium while variable levels of P were supplied from a solution. A balance between P and Zn levels was attained through trial and error so that only the highest level of P induced interveinal chlorosis and stunting.

In both crops, P induced the deficiency without causing a decrease in the Zn nutritional status of the plants. Increasing the soil Zn level at a given P level resulted in plants with normal growth. The results are interpreted to support the hypothesis that normal metabolism is dependent upon a physiological balance between P and Zn.

¹ Contribution from the Soil and Water Conserv. Res. Div. ARS, USDA, in cooperation with the Washington Agr. Exp. Sta. Scientific Paper 2885. College of Agr., Washington State Univ.

² Research Soil Scientists, USDA, Prosser, Washington and Beltsville, Maryland, respectively.

Received for publication June 26, 1967. Accepted for publication September 7, 1967.