||Assessing Impacts of Ozone on Agricultural Crops: 1. Overview.
Heck, W. W. ;
Cure, W. W. ;
Rawlings, J. O. ;
Zaragoza, L. J. ;
Heagle, A. S. ;
||Agricultural Research Service, Beltsville, MD. ;North Carolina Agricultural Research Service, Raleigh. ;North Carolina State Univ. at Raleigh.;Corvallis Environmental Research Lab., OR.
Farm crops ;
Air pollution ;
Environmental impacts ;
Statistical analysis ;
Air pollution effects(Plants)
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||The Environmental Protection Agency initiated the National Crop Loss Assessment Network (NCLAN) to develop pollutant dose-plant response information for economically important crop species. The primary thrust of the NCLAN program is to assess the effects of O3 on crop yield. This paper is part of the third assessment report from NCLAN which is composed of several cooperating programs with field sites in different regions of the country. Plants are grown in the field using open-top chambers for the control and manipulation of gas concentration around the crop plants. Four to six O3 treatments are used in each experimental design and O3 is added for 7 h/day in constant or proportional amounts to ambient air O3 concentrations. The most extensive ambient O3 monitoring data in the U.S. are provided by the Storage and Retrieval of Aerometic Data (SAROAD) system. By use of an interpolative process called Kriging, county level O3 concentrations can be estimated. Ozone concentrations are monitored in the NCLAN treatment chambers using shared-time monitoring. Data are summarized and presented as a seasonal mean of the daily 7-h mean O3 concentrations for each treatment. The NCLAN air quality data are compatible with the SAROAD system. The NCLAN uses 0.025 ppm as an estimate of natural O3 for comparison with the O3 treatment concentrations. This value is also approximately equal to the O3 concentrations in the charcoal filtered chambers. In this report four O3 averaging times are compared for possible use in O3 dose-crop yield models.
||Also pub. as North Carolina Agricultural Research Service, Raleigh Paper 9189. Prepared in cooperation with North Carolina State Univ. at Raleigh.
||Pub. in Air Pollution Control Association Jnl., v34 n7 p729-735 1984.
|NTIS Title Notes
||Reprint: Assessing Impacts of Ozone on Agricultural Crops: 1. Overview.
|PUB Date Free Form
||6C; 2D; 68A; 57C; 98D
||Not available NTIS