Plant Uptake and Fate of Soil-Applied Zinc
- A. L. Brown,
- B. A. Krantz and
- P. E. Martin
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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