Dealing with ultra-low spray deposits in experiments

Research output: Chapter in Book/Report/Conference proceedingConference paper


In spray drift experiments, measuring spray deposits far downwind may yield deposits values that approach or go below the level of detection. Particularly, when deposits are corrected for background concentrations of whatever origin, in principle values at or even below zero may result. A conventional way to deal with those data is to adjust them to zero or a ‘very low but positive’ value. Alternatively, zero and negative deposits are simply removed from the data set. In either way, such adjustments may affect the results in a way the researcher may not have foreseen or intended. In this study different common methods of dealing with ultra-low deposition values are compared. It is discussed how these methods may affect the results and their interpretation. An alternative method is introduced and discussed which may reduce the negative implications of the common methods. The study is supported by various computational examples.
Original languageEnglish
Title of host publicationInternational Advances in Pesticide Application
Place of PublicationWarwick UK
PublisherAssociation of Applied Biologists Warwick Enterprise Park
Publication statusPublished - 2018
EventInternational Advances in Pesticide Application - Brighton, United Kingdom
Duration: 9 Jan 201811 Jan 2018

Publication series

NameAspects of Applied Biology
PublisherAssociation of Applied Biologists
ISSN (Print)0265-1491


ConferenceInternational Advances in Pesticide Application
Abbreviated titleIAPA
Country/TerritoryUnited Kingdom


  • spray drift
  • level of detection
  • experiments
  • probability


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