Zinc sulfate is more effective at producing wheat shoots than zinc oxide in an alkaline soil but both sources are equally effective in an acid soil
R. F. Brennan A D and M. D. A. Bolland B CA Department of Agriculture and Food, 444 Albany Highway, Albany, WA 6330, Australia.
B Department of Agriculture and Food, PO Box 1231, Bunbury, WA 6231, Australia.
C School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
D Corresponding author. Email: rbrennan@agric.wa.gov.au
Australian Journal of Experimental Agriculture 46(12) 1615-1620 https://doi.org/10.1071/EA05071
Submitted: 4 March 2005 Accepted: 4 August 2005 Published: 10 November 2006
Abstract
The effectiveness of zinc, as either zinc sulfate (ZnSO4.7H2O, 22.4% Zn) or zinc oxide (ZnO; 80% Zn) applied to an acid sand or an alkaline sandy clay, at producing wheat shoots was compared in a glasshouse experiment using yield of 50-day-old wheat (Triticum aestivum L.) plants. The fertilisers were applied as fine powders and mixed through the soil. Both fertilisers were equally effective in the acid soil, but the oxide was about half as effective as the sulfate in the alkaline soil; about twice the amount of zinc as the oxide was required to produce the same yield as zinc added as the sulfate. The amount of zinc required to produce 90% of the maximum yield was 38 µg Zn/pot for both sources of zinc in the acid soil, and 100 µg Zn/pot for the sulfate source and 250 µg Zn/pot for the oxide source for the alkaline soil. Critical zinc, which is the zinc concentration in the youngest emerged leaf that was related to 90% of the maximum yield of shoots, was about 13 mg/kg for both sources of zinc and both soils. Zinc oxide may be less effective at producing wheat shoots than zinc sulfate in alkaline soils of south-western Australia.
Acknowledgments
The Chemistry Centre (WA) measured soil properties and zinc concentration in shoot dry matter. Technical assistance was provided by Frank O’Donnell. Funds for this study were provided by the Government of Western Australia.
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