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Additional field spray drift data for the buffer zone review - PS2015

There is currently a review of spray drift data being undertaken by PSD, using examples of data from previous CSL field spray drift studies and data from wind tunnel experiments. Many of the wind tunnel studies have been done with nozzles and operating conditions for which there are no corresponding field data.

Data is urgently required by PSD in the current review of the setting unsprayed buffer zones (UBZ) for arable sprayers

The primary objective of the work will be to generate data for airborne and ground deposited spray drift arising from typical arable current spraying practices. Data currently used by the Pesticides Safety Directorate relates to spraying practices involving tractor forward speeds of 8 k/h and boom heights of 50cm above a short crop (<15cm height) with boom widths of 12m. Modern practices for arable spraying involve spraying at tractor forward speeds of >10k/h (see reference to Pesticide Usage Survey data) and boom heights of 0.5 to 1.0m above the crop with boom widths of 24m or greater.

The use of nozzles such the XR (extended range) is more widespread now compared, and wind tunnel studies indicate that drift from the XR is greater than that from the standard flat fan nozzles (FF).

There are also data from wind tunnel studies to indicate that an increase of boom height and forward speed increases the amount of spray drift losses from the cropped area. Studies are therefore proposed with vehicle mounted boom sprayers operating in the range of conditions likely to be encountered in the UK.

Tractor forward speed of 16 kph;
Boom heights of 0.7, 0.9 and 1.1m above a short crop;
Boom width 24m
Nozzles - 3 nozzle types selected from
- Standard flat fan nozzle used for LERAP (e.g. 11003)
- Fine Spray Quality (e.g. 11002)
- A.I. nozzle
- XR nozzle

This fieldwork would be done in conjunction with existing field spray drift studies, allowing great cost savings to generate the data. Details of the field studies already planned for the autumn of 2007 are given in Section 7.
The primary objective of the work will be to generate data for airborne and ground deposited spray drift arising from typical current spraying practices.

Specific objectives are:
1. Generate data for 3 nozzles types and 3 boom heights for ground deposited and airborne drift at distances up to 20m down wind of the treated area
2. Provide an evaluation of the data for use by PSD investigating the setting of buffer zones for the UK.
Project Documents
• FRP - Final Report : Additional Field Spray Drift Data for the Buffer Zone Review   (386k)
Time-Scale and Cost
From: 2007

To: 2008

Cost: £26,309
Contractor / Funded Organisations
Central Science Laboratory
Arable Farming              
Environment and Health              
Environmental monitoring              
Environmental Protection              
Health Effects              
Monitoring and evaluation              
Pesticide use              
Public Health              
Risk assessment and management              
Rural Issues              
Fields of Study
Pesticide Safety