1 The trapping of pollutants beneath a stable layer or inversion, and their transport down towards the ground. See Kim et al. (2005) J. Atmos. Scis 62, 6.
2 Soil fumigation is a chemical or physical process that kills viable weeds, seeds, soil-borne pathogens, and nematodes (Cockx and Simonne (nd), University of Florida, IFAS Extension).
edis.ifas.ufl.edu/pdffiles/HS/HS20100.pdf Cockx and Simonne article on University of Florida website.