Fig. 1.
Fig. 1.

Concentration of volatile organic compounds at the Florida sites at 2, 5, and 13 d after application. Air samples were collected at a 12-cm depth in the center of the bed. 1,3-Dichloropropene was not applied to Site 3. Sites 1 and 3 were covered by metalized film; Site 2 was covered by virtually impermeable film.

 


Fig. 2.
Fig. 2.

Concentration of soil fumigants in the soil atmosphere at the Florida sites at 2 and 5 d after application. Air samples were collected at a 12-cm depth in the center of the bed. 1,3-Dichloropropene (1,3-D) was not applied to Site 3. Sites 1 and 3 were covered by metalized film; Site 2 was covered by virtually impermeable film. MITC, methyl isothiocyanate; Pic, chloropicrin.

 


Fig. 3.
Fig. 3.

Nonvapor phase concentration of soil fumigants at the Florida sites at 2 and 5 d after application. 1,3-Dichloropropene (1,3-D) was not applied to Site 3. Sites 1 and 3 were covered by metalized film; Site 2 was covered by virtually impermeable film. CP, chloropicrin; MITC, methyl isothiocyanate.

 


Fig. 4.
Fig. 4.

Concentration of volatile organic compounds at the Georgia sites at 2 and 5 d after application. Air samples were collected at a 12-cm depth in the center of the bed. Site 1 was covered by virtually impermeable film; Sites 2 and 3 were covered by low-density polyethylene.

 


Fig. 5.
Fig. 5.

Concentration of fumigants in the soil atmosphere at the Georgia sites at 2 and 5 d after application. Air samples were collected at a 12-cm depth in the center of the bed. Site 1 was covered by virtually impermeable film; Sites 2 and 3 were covered by low-density polyethylene. DMDS, dimethyl disulfide; MITC, methyl isothiocyanate; Pic, chloropicrin.

 


Fig. 6.
Fig. 6.

Nonvapor phase concentrations of soil fumigants concentrations at the Georgia sites at 2 and 5 d after application. Site 1 was covered by virtually impermeable film; Sites 2 and 3 were covered by low-density polyethylene. DMDS, dimethyl disulfide; MITC, methyl isothiocyanate; Pic, chloropicrin.