Drift Measurement Systems

In an effort to meet the requirement of buffer zone reductions in certain European countries, TeeJet Technologies conducts rigorous distribution and drift testing of its line of TeeJet nozzles by prominent European research institutions. The Silsoe Research Institute in the United Kingdom and the Federal Biological Research Center for Agriculture and Forestry in Germany are two of the independent testing institutions commonly used by TeeJet Technologies.


1Local Environment Risk Assessments for Pesticides (LERAP)

LERAP requirements relate to the ability to reduce the width of a buffer zone defined to protect surface water from contamination by plant protection products when the results from a local risk assessment indicate that it is safe to do so. One of the factors that is taken into account as part of the LERAP assessment is the use of technical (operational and engineering) controls to reduce the amount of spray drift produced during an application that would be deposited within the local environment. Spray application systems that have been shown to have such a drift-reducing characteristic will be awarded a "LERAP-Low Drift Star Rating," which can then be used in the local drift risk assessment procedures.

Star ratings are awarded by comparing the levels of drift from TeeJet spray tips with corresponding drift levels from a reference system. Drift assessment is conducted in a wind tunnel using water and a 0.1% solution of non-ionic surfactant for both the reference and test nozzles at a height of 20" (0.5 m).

The TeeJet spray tips gaining accreditation were tested under the prescribed protocol by Silsoe Research Institute, Wrest Park, Silsoe, Bedford, MK45 4HS UK, and then sent on to be accredited by another approved laboratory, in this case Central Science Laboratory, Sand Hutton, York, Y041 1LZ UK.

Full details about LERAP and its accreditation procedures can be obtained from http://www.pesticides.gov.uk/fg_leraps.asp.

Federal Biological Research Center for Agriculture and Forestry (BBA)

The Department for Plant Protection Products and Application Techniques, a Department of the German BBA.

         

2In Germany, the buffer zones in arable crops, orchards, vineyards, or hops 
  are dependent on application conditions. A special system measuring the
  Drift Potential Index (DXI) takes into account the type of adjacent water 
  body and its bank vegetation. The application technique used has the
  main influence on the buffer zone width.


With the application for certification as loss reducing equipment, the sprayer manufacturer has to supply test results that prove drift reduction. In the case of ordinary boom sprayers, measurements in a wind tunnel on single nozzles are sufficient. These tests are done by the BBA following a special protocol.

The TeeJet spray tips gaining accreditation were tested under the prescribed protocol by The Department for Plant Protection Products and Application Techniques, Biologische Bundesanstalt für Land-und Forstwirtschaft, Messeweg 11/12, D-38104 Braunschweig, Germany. Full details about BBA and its accreditation procedures can be obtained from http://www.BBA.de.

 Definition of LERAP-Low Drift Star Ratings

 Terminology

 Drift Performance
(measureable as ground deposit)

  No LERAP-Low Drift rating   Drift levels greater than 75% of that 
  from reference system
  LERAP-Low Drift-one star*   Drift levels greater than 50% and up 
  to 75%  of that from reference system
  LERAP-Low Drift--two star**   Drift levels greater than 25% and up 
  to 50% of that from reference system
  LERAP-Low Drift-three star***     Drift levels up to 25% of that from 
  reference system

Disclaimer: This information is subject to change.

1Pesticides Safety Directorate. 07 August 2003. http://www.bba.bund.de/cln_045/DE/Home/homepage__node.html__nnn=true

2Herbst, A. 2001. A Method to Determine Spray Drift Potential from Nozzles and its Link to Buffer Zone Restrictions. ASAE Meeting Paper No. 01-1047. St. Joseph, MIch.: ASAE

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