Table 2. Experimental half-lives (days ± SE).

SE = Standard Error. The superscripts a,b,c,d represent significantly different slopes in Figs 1–6 (F test in Graph Pad Prism V 6.0, S5 Table), indicating differences in persistence between treatments for that herbicide.

Herbicide	Dark no sediment	Light no sediment	Dark with sediment	Light with sediment
Diuron	499 ± 31 a	404 ± 16 b	279 ± 7 c	139 ± 6 d
Atrazine	300 ± 13 a	330 ± 32 a	201 ± 6 b	107 ± 7 c
Hexazinone	1994 ± 207 a	1186 ± 73 b	1025 ± 51 b	201 ± 18 c
Tebuthiuron	1766 ± 188 a	3330 ± 419 b	1474 ± 106 a	944 ± 52 c
Metolachlor	147 ± 13 a	93 ± 8 b	103 ± 5 b	32 ± 3 c
2,4-D	59 ± 15 a	1920 ± 417 b	56 ± 6 a	288 ± 12 c