title: The impact of tropospheric ozone pollution on trial plot winter wheat yields in Great Britain - an econometric approach.
abstract: Numerous experiments have demonstrated reductions in the yields of cereal crops due to tropospheric O(3), with losses of up to 25%. However, the only British econometric study on O(3) impacts on winter wheat yields, found that a 10% increase in AOT40 would decrease yields by only 0.23%. An attempt is made here to reconcile these observations by developing AOT40 maps for Great Britain and matching levels with a large number of standardised trial plot wheat yields from many sites over a 13-year period. Panel estimates (repeated measures on the same plots with time) show a 0.54% decrease in yields and it is hypothesised that plant breeders may have inadvertently selected for O(3) tolerance in wheat. Some support for this is provided by fumigations of cultivars of differing introduction dates. A case is made for the use of econometric as well as experimental studies in prediction of air pollution induced crop loss.
authors.affiliation: Centre for Environmental Policy, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom. eviekal@googlemail.com
authors.forename: Evridiki
authors.initials: E
authors.lastname: Kaliakatsou
authors.forename: J Nigel B
authors.initials: JN
authors.lastname: Bell
authors.forename: Colin
authors.initials: C
authors.lastname: Thirtle
authors.forename: Daniel
authors.initials: D
authors.lastname: Rose
authors.forename: Sally A
authors.initials: SA
authors.lastname: Power
mesh_terms: D000393:Air Pollutants / Q000191:economics / Q000494:pharmacology*; D000397:Air Pollution / Q000191:economics*; D018533:Biomass; D010126:Ozone / Q000191:economics / Q000494:pharmacology*; D014908:Triticum / Q000187:drug effects* / Q000191:economics / Q000254:growth & development*; D006113:United Kingdom
chemical_list: D000393:Air Pollutants; D010126:Ozone