1999 2000 Active substance 1st 2nd 3rd 4th 1st 2nd 3rd Time of calculation 46 122 28 98 76 78 30 Atrazine 0.0386 0.0084 0.0048 BAM   (2.6- dichlorobenzamide) 0.1629 0.0271 0.0546 Benazolin 0.1256 Bentazone 0.0485 66.964 4.6133 0.2744 0.1842 3.1456 0.0956 Bromoxynil 0.1030 0.0114 Carbofuran Chloridazon 0.0386 Chlorsulfuron Cyanazine 0.0545 Desethylatrazine 0.0205 Desethylterbuthylazine 0.0521 0.1159 0.0344 0.0547 0.0662 Desisopropylatrazine 0.0386 0.0742 0.0246 0.0430 0.0032 Dicamba Dichlorprop 0.0386 Dimethoate 0.0773 Dinoseb 0.0403 Diuron 0.8157 0.4451 0.0063 0.5172 0.0326 DNOC 0.1932 0.0750 0.0274 0.1525 0.2441 Ethofumesate 0.2318 Fenpropimorph 0.0062 0.0189 Flamprop Fluazifop Hexazinone 0.7088 0.0043 Hydroxyatrazine 0.0386 0.0224 Hydroxycarbofuran Hydroxysimazine 0.3091 Hydroxyterbuthylazine 0.0006 0.2318 0.0855 0.0152 Ioxynil 0.1546 0.0076 Isoproturon 1.4794 2.1345 0.1159 6.7914 2.9444 0.8165 0.3994 Lenacil 0.1235 Linuron 0.0386 MCPA 0.1932 0.1471 0.0287 Mecoprop 0.0386 0.0105 Methabenzthiazuron 0.0344 Metamitron 0.0386 Metribuzin 0.0386 0.1377 Metsulfuron-methyl Nitrophenol 0.5814 0.2479 0.0488 0.0299 0.1324 Pendimethalin 1.9081 0.1159 2.4536 0.0538 0.6393 0.0520 Pirimicarb 0.0004 0.0304 Prochloraz 0.0100 0.0086 Propiconazole 1.0243 0.1159 0.0131 Propyzamide 0.0062 Simazine 0.0386 Terbuthylazine 0.1256 0.5796 0.0511 0.1864 0.3205 Thifensulfuron Triadimenol 0.1159 Triasulfuron 2.4-D 0.0072 2.4-dichlorphenol