Estimating input data for computations on the volatilisation of pesticides from plant canopies and competing processes

M. Leistra

Research output: Book/ReportReportProfessional

Abstract

Volatilisation of pesticides from the crop can be an important emission pathway to the environment. A computation module was developed for making estimates on this emission. However, various input data for this module are not measured directly in registration procedures, so they have to be estimated from theory or from a diversity of experimental data. Vapour pressure is the most important property in volatilisation, which needs a critical evaluation in case of conflicting data. Diffusion coefficients for transport in a laminar boundary layer are estimated from theory. Penetration of pesticides into the leaves is highly affected by substances in the formulation and by environmental conditions. Pesticide deposit is often vulnerable to washoff by rainfall. Often, no directly measured rates are available for photochemical transformation on plant surfaces, so these have to be estimated from a variety of experimental results. In critical cases, comprehensive experiments with micro-agro-ecosystems and/or in the field are needed.
Original languageEnglish
Place of PublicationWageningen
PublisherAlterra
Number of pages79
Publication statusPublished - 2005

Publication series

NameAlterra-rapport
PublisherAlterra
No.1256
ISSN (Print)1566-7197

Keywords

  • pesticides
  • deposition
  • diffusion
  • volatilization
  • emission
  • surfaces
  • leaves
  • uptake
  • crops
  • canopy
  • canopy penetration
  • foliage
  • runoff
  • pollution

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