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- W2076558499 abstract "In the summers of 1960 and 1961, groups from the Canada Department of Agriculture, the Meteorological Service of Canada, and the Canada Department of National Health and Welfare conducted a joint study in a tobacco-growing area along the north shore of Lake Erie. The purpose of the study was to determine the causal agent for weather fleck damage to tobacco crops. A number of air pollutants were monitored and the results correlated with extensive observations of meteorological phenomena and effects on rate of growth and fleck damage to leaves of tobacco plants in experimental plots. Ozone concentrations followed a diurnal cycle, rising a few hours after sunrise, peaking in early afternoon at about 5 pphm, and dropping to a minimum of less than 1 pphm during the night. Other measurements indicated the presence of NO2 in the order of 1 pphm, aldehydes about 0.2 pphm or lower, and negligible concentrations of SO2. Cracking of stretched rubber strips followed the ozone values although, in general, the cracking index was greater than could be attributed to ozone (by oxidized KI) alone. The maximum ozone value recorded during the two growing seasons was IS pphm. A dosage of 20 pphm-hr was found sufficient to cause weather fleck or ozone damage to susceptible tobacco leaves. In addition meteorological data could be used to predict weather fleck attacks one to four days in advance." @default.
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- W2076558499 date "1966-04-01" @default.
- W2076558499 modified "2023-10-18" @default.
- W2076558499 title "Summer Ozone Concentrations in Southern Ontario in Relation to Photochemical Aspects and Vegetation Damage" @default.
- W2076558499 doi "https://doi.org/10.1080/00022470.1966.10468463" @default.
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