The Data Reporting Guideline (DRG) for Terrestrial Field Dissipation Studies, Series 164-1, gives guidance to pesticide registrants on the format for their study report so that the Agency can review it efficiently. This guidance clarifies sections in the existing Pesticides Assessment Guidelines, Subdivision N, on data reporting. It provides an outline for the study report and describes the topics which should be addressed such as the composition of the product used, characterization of the site, description of the handling and analysis of samples, etc. and provides guidance on the presentation of the results of the study. Data submitters can use the DRG in preparing their reports for submission to EPA to meet 40 CFR 158 requirements for the registration of pesticides. The DRG for Series 164-1, Terrestrial Field Dissipation is only one of a number of DRG's published by the National Technical Information Service as an addendum to Subdivision N of the Pesticide Assessment Guidelines.