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Alternative Ozone Dose Metrics to Characterize Ozone Impact on Crop Yield Loss¹

Dep. of Statistics, North Carolina State Univ., Box 8203, Raleigh, NC 27695;

V. M. Lesser

Dep. of Biostatistics, Univ. of North Carolina, Chapel Hill, NC 27714;

A. S. Heagle

Dep. of Plant Pathology, USDA-ARS, North Carolina State Univ., Raleigh, NC 27695;

W. W. Heck

Dep. of Botany, USDA-ARS, North Carolina State Univ., Raleigh, NC 27695.

^* Corresponding author.

ABSTRACT

Previous studies of the National Crop Loss Assessment Network (NCLAN) relating the impact of ozone (O₃) on agricultural crops have used the seasonal arithmetic average of O₃ for either a 7- or 12-h daily period as the measure of dose in the dose response relationships. This study investigated the use of alternative dose metics that gave differential weighting to hourly O₃ concentrations according to level of O₃, period of day, or total hourly solar radiation. Data were used from two NCLAN studies in which two different methods of O₃ addition were used for 7 h/d. In addition, one study included 12 h/d exposure for one method of O₃ addition. The residual sums of squares from fitting a common Weibull response model to each experiment were compared over the range of dose metrics. The results suggested that the dose metrics using equal weighting of peaks and valleys closely reflected plant reaction to O₃, but the fit of the dose-response models improved if relatively little weight was given to the final 5-h component (1700–2200 h EDT) of the 12-h exposure period. Weighting by total hourly solar radiation gave results very similar to the best obtained from differential peak-valley weighting and 7 h:5 h weighting.

Key Words: Weibull response model • Soybean • Glycine max. (L.) Merr. • Tobacco • Nicotiana tobaccum L. • Power weighted mean

¹ The use of trade names in this article does not imply endorsement by the USDA or the North Carolina Agric. Res. Service of the products named, nor criticism of similar ones not mentioned. Although this research was partly funded by the USEPA, it has not been subjected to USEPA review and therefore does not necessarily reflect the views of the USEPA and no official endorsement should be inferred.

Cooperative investigations of the USDA-ARS and the North Carolina State Univ. Journal Series Paper no. 10967 of the North Carolina Agric. Res. Service, Raleigh, NC 27695-7601. Research partly supported by an Interagency Agreement between the USEPA and the USDA; Interagency Agreement no. AD-12-F-1-490-2, and Specific Coop. Agreement no. 58-43YK-6-0041 between the USDA and the North Carolina Agric. Res. Service.

Received for publication April 23, 1987.