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Zare, Mohsen ; Khoshgoftarmanesh, Amir H. ; Norouzi, Mojtaba ; Schulin, Rainer:
Critical Soil Zinc Deficiency Concentration and Tissue Iron : Zinc Ratio as a Diagnostic Tool for Prediction of Zinc Deficiency in Corn.
In: Journal of Plant Nutrition.
Bd. 32
(2009)
Heft 12
.
- S. 1983-1993.
ISSN 1532-4087
DOI: https://doi.org/10.1080/01904160903308101
Abstract
Zinc (Zn) fertilizer application is most economic if based on soil test and plant analysis information. The aim of this study was to determine the soil test [diethylenetrinitrilopentaacetate (DTPA) and ethylenetriaminepentaacetic acid (EDTA) extractable] Zn-critical levels and tissue Fe/Zn ratio for corn (Zea mays L.). A greenhouse experiment with 12 soil series and two Zn fertilizer treatments (0 and 15 mg Zn kg⁻¹ as zinc sulfate) was conducted. Critical Zn deficiency levels were determined using the Cate-Nelson procedure. Relative corn yield varied from 0.59 to 1.64. Critical deficiency levels based on the Cate-Nelson method were 1.50 and 1.17 mg kg⁻¹ for DTPA and EDTA-extracted soil Zn, respectively. No accurate critical deficiency level could be established using the shoot Zn concentrations. The critical iron (Fe)/Zn ratio in the corn shoot was 3.9. Values greater than 3.9 indicate hidden Zn deficiency and probable response to applied Zn.