Searches were conducted within Web of Science (SeptembereDecember,
2014) and Google Scholar to identify experimental
studies related to the effects of ozone exposure on N-fixation,
including physiological impacts and effects on an agroecosystem
scale. The search terms used included: ozone and nodulation;
ozone and nitrogen fixation; ozone and legume(s); ozone and nitrogen
metabolism; and ozone with the names of commonly grown
legume crops. The main effects of ozone are summarised in Table 1
and described in the text.