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Plant Uptake and Fate of Soil-Applied Zinc¹

ABSTRACT

Greenhouse assays on 53 soils using sweet corn harvested in the vegetative state as an indicator crop showed 84% of the soils containing 0.55 ppm. or less dithizone-extractable Zn responded to soil-applied ZnSO₄. Likewise, 76% of those above 0.55 ppm. dithizone-extractable Zn did not respond to Zn applications. Generally Zn concentration in plants and total uptake increased with increasing rates of applied Zn. The average recovery of the applied Zn from 5 and 25 pounds per acre was 9.0 and 4.8%, respectively. Approximately 35% of the soil-applied Zn was found as dithizone-extractable after plants were harvested. Soil samples from several fields to which ZnSO₄ had been applied indicated there may be a residual effect for several years. Laboratory studies with soil columns showed there was practically no downward movement of Zn as a result of leaching.

¹ Contribution from the Department of Soils and Plant Nutrition, University of California, Davis. Presented before the Western Society of Soil Science, June 16, 1960, at Eugene, Ore.

² Lecturer in Soils, Extension Soils Specialist, and Laboratory Technician, respectively.

Received for publication March 23, 1961. Accepted for publication May 23, 1961.