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Mitigation strategies to reduce pesticide inputs into ground- and surface water and their effectiveness; A review
by:In: SCIENCE OF THE TOTAL ENVIRONMENT, Vol. 384, Nr. 1-3
(2007)
, p. 1-35.
Abstract
In this paper, the current knowledge on mitigation strategies to reduce
pesticide inputs into surface water and groundwater, and their
effectiveness when applied in practice is reviewed. Apart from their
effectiveness in reducing pesticide inputs into ground and surface
water, the mitigation measures identified in the literature are
evaluated with respect to their practicability. Those measures
considered both effective and feasible are recommended for implementing
at the farm and catchment scale. Finally, recommendations for modelling
are provided using the identified reduction efficiencies. Roughly 180
publications directly dealing with or being somehow related to
mitigation of pesticide inputs into water bodies were examined. The
effectiveness of grassed buffer strips located at the lower edges of
fields has been demonstrated. However, this effectiveness is very
variable, and the variability cannot be explained by strip width alone.
Riparian buffer strips are most probably much less effective than
edge-of-field buffer strips in reducing pesticide runoff and erosion
inputs into surface waters. Constructed wetlands are promising tools
for mitigating pesticide inputs via runoff/erosion and drift into
surface waters, but their effectiveness still has to be demonstrated
for weakly and moderately sorbing compounds. Subsurface drains are an
effective mitigation measure for pesticide runoff losses from slowly
permeable soils with frequent waterlogging. For the pathways drainage
and leaching, the only feasible mitigation measures are application
rate reduction, product substitution and shift of the application date.
There are many possible effective measures of spray drift reduction.
While sufficient knowledge exists for suggesting default values for the
efficiency of single drift mitigation measures, little information
exists on the effect of the drift reduction efficiency of combinations
of measures. More research on possible interactions between different
drift mitigation measures and the resulting overall drift reduction
efficiency is therefore indicated. Point-source inputs can be mitigated
against by increasing awareness of the farmers with regard to pesticide
handling and application, and encouraging them to implement
loss-reducing measures of ��best management practice". In catchments
dominated by diffuse inputs at least in some years, mitigation of
point-source inputs alone may not be sufficient to reduce pesticide
loads/concentrations in water bodies to an acceptable level. C 2007
Published by Elsevier B.V.


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