Pesticides in streams and subsurface drainage water within two arable catchments in Denmark: Pesticide application, concentration, transport and fate
Table iii
Aggregated results from the 2 stream stations in the Lillebæk catchment and the
stream station in the Odderbæk catchment. In the table the average annual pesticide
use in the two catchments is shown together with the average detection frequency
and average maximum concentration for 18 pesticides applied in the two catchments
during the two -year period. Moreover, the loss:applied ratio is shown for each
catchment for a one-year period (4th quarter 1999 to 3rd quarter 2000). Note that the
ratio is a minimum because of the pesticide loss only being calculated for the period
covered with sampling.
Tabel iii
Gennemsnitlig årlig anvendelse af pesticider i de tre målte oplande i Lillebæk og
Odderbæk. Derudover er vist den gennemsnitlige fundhyppighed og gennemsnitlig
maximum koncentration af 18 pesticider der blev anvendt i oplandene i de 2 måleår.
Endelig er det beregnede tabs:anvendelse ratio vist for året omfattet af 4 kvartal 1999
til 3 kvartal 2000. Den viste ratio er et minimums estimat da tabet kun er beregnet for
perioder med prøvetagning.
Average use of
pesticides
(herbicides - %)
(kg active
substances)
Average
detection
Frequency
(%) (}stdv)
Average
maximum
concentration
(ng/l) (}stdv)
Minimum
loss:applie
d ratio
(%)
Lillebæk upstream culverted sub-
catchment (229 ha)
150 (58%)
36 (}29)
521 (}1078)
0.0233
Entire Lillebæk catchment (435 ha)
184 (53%)
28 (}32)
211 (}455)
0.0109
Odderbæk catchment (1143 ha)
1034 (86%)
13 (}20)
204 (}678)
0.0031
|