Maize has been grown in soils treated with aldrin-14C at locations in Germany (2.9 kg/ha), England (3.0 kg/ha), Spain (3.0 kg/ha), and the United States (3.0 kg/ha), and wheat has been grown in Germany (2.9 kg/ha) and England (3.2 kg/ha). Additionally, aldrin-14C has been appliedto wheat seeds at locations in Germany and England (0.1% of the weight of grain). At harvest, residues did not exceed 0.01 ppm in the grain. The main radioactive products identified by glcmass spectra in soils and in the plants of all loca-tions were dieldrin and dihydrochlordene dicarboxylic acid (l,2,3,4,8,8-hexachloro-l,4,4a,6,7,7ahexahydro-l,4-endomethyleneindene-5,7-dicarboxylic acid). Unchanged aldrin, photodieldrin, unknown acidic compounds, and an unknown nonpolar metabolite were detected in trace amounts. In wheat soil, up to 5% of the recovered radioactivity was due to photoaldrin. The quantitative data for aldrin and metabolites were different for the four locations.In two previous papers, we reported outdoor studies with aldrin-14C in potatoes (Klein et al., 1973) and sugar beets (Kohli et al., 1973), following soil application in 1969 at a location in Germany and England. In the same year, aldrin-14C was applied to soils, and maize was grown in Birlinghoven, Germany, Sittingbourne, U. K., Sevilla, Spain, and Modesto, Calif., under the same experimental conditions. Furthermore, in Germany and England, wheat was grown in aldrin-14C-treated soils, and at both locations, seed dressing was used additionally for the same crop. The rationale for these experiments was the same as described previously. The results are described in this 610 J.
