Abstract
We believe that Nicholls's conclusion1 — that reduced frost frequency has been predominantly responsible for 30-50% of the 45% increase in average Australian wheat yield between 1952 and 1992 — is not correct.
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References
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Hamblin, A. and Kyneur, G. Trends in Wheat Yields and Soil Fertility in Australia (Aust. Govt. Publ. Serv., Canberra, 1993).
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Gifford, R., Angus, J., Barrett, D. et al. Climate change and Australian wheat yield. Nature 391, 448–449 (1998). https://doi.org/10.1038/35056
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DOI: https://doi.org/10.1038/35056
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