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Effect of Exogenous Carbon on Movement of Simazine and 2,4-D in Soils

^a Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, P.O. Box 1052, 41080 Sevilla, Spain
^b Dep. Soil, Water & Climate, Univ. Minnesota, St. Paul, MN 55108
^c USDA-ARS, Soil and Water Management Research Unit, 1991 Upper Buford Cir. Rm 439, St. Paul, MN 55108

View larger version (15K): [in a new window]   Fig. 1. (a) Simazine sorption isotherms on unamended sandy soil (Soil P2) and amended sandy soil plus liquid organic amendment (P2 + LOA), sandy soil plus solid organic amendment (P2 + SOA), and sandy soil plus solid urban waste (P2 + SUW) and (b) 2,4-D sorption isotherms on P2 + LOA, P2 + SOA, and P2 + SUW. Symbols are experimental data points, wheras lines are the Freundlick-fit sorption isotherms.

View larger version (19K): [in a new window]   Fig. 2. (a) Simazine and (b) 2,4-D dissapation curves in unamended sandy soil (Soil P2) and amended sandy soil plus liquid organic amendment (P2 + LOA), sandy soil plus solid organic amendment (P2 + SOA), and sandy soil plus solid urban waste (P2 + SUW).

View larger version (32K): [in a new window]   Fig. 3. Relative and cumulative Hg pore volume for unamended sandy soil (Soil P2) and amended sandy soil plus liquid organic amendment (P2 + LOA), sandy soil plus solid organic amendment (P2 + SOA), and sandy soil plus solid urban waste (P2 + SUW).

View larger version (21K): [in a new window]   Fig. 4. (a) Simazine and (b) 2,4-D breakthrough curves in unamended sandy soil (Soil P2) and amended sandy soil plus liquid organic amendment (P2 + LOA), sandy soil plus solid organic amendment (P2 + SOA), and sandy soil plus solid urban waste (P2 + SUW).