Development of a System for Evaluating and Reporting Economic Crop Losses Caused by Air Pollution in California. II. Yield Study. IIA. Prototype Ozone Dosage-Crop Loss Conversion Function.

摘要

A prototype assessment method (dosage-crop loss conversion function) for determining sweet corn losses from ozone was developed utilizing the functional relationship between crop and ambient ozone dosages. Environmental variables were tested but were not observed to significantly influence sweet corn yield. The procedures for the development of this conversion function could be applied to develop conversion functions for other crops. Fumigation studies compared two different regimes of ozone fumigations and indicated frequent short-term exposures had a far greater effect on yield reductions than less frequent exposures of longer duration. Nutritional analyses of 1972PAN (peroxyacetyl nitrate) and ozone fumigated crops were completed. PAN did not appear to influence significant changes in the levels of most nutritional constituents in harvested samples. Ozone was found to reduce levels of carbohydrates and solids in corn and tomatoes. Vitamin levels were observed to have a varied response specific to certain crops. Overall,ozone was observed to have a much greater effect on nutritional levels than PAN.