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The effect of formulation and adjuvant use on pesticide spray behaviour - PA1726

Previous work has shown that the physical properties of a spray liquid substantially influence spray formation processes with implications for droplet behaviour in terms of drift risk, retention on target surfaces and uptake. The proposed work builds on these previous studies at both Long Ashton Research Station and Silsoe Research Institute with the aims of directly relating measurements of droplet size and velocity distributions made in still air in a spray chamber to typical conditions on a boom sprayer and quantifying the likely effects of formulation differences and adjuvant use on spray behaviour in terms of drift and retention under field conditions. The study will be based on measurements in spray chamber/windtunnel conditions that will model field conditions. The study will include both conventional hydraulic pressure nozzles and air induction designs and will provide further information relating to the deposition characteristics of sprays with air included droplets.
Results from the work will enable previous information from detailed laboratory studies to be related to typical field conditions with some validation of likely trends from experiments conducted in well controlled conditions. This will then form a basis for an examination of the interactions between application variables, formulation effects and adjuvant use on the field performance of plant protection products.
1. To examine the effects on spray formation from the main types of agricultural spray nozzle, including the air induction design, of operating in air speeds typical of those associated with the use of boom sprayers on ground-operated vehicles;

2. To quantify the effects that changes in formulation type and adjuvant use can have on the risk of drift from the main nozzle types including hydraulic pressure flat fan and cone types and air induction nozzles;

3. To examine the likely changes in spray deposition patterns under realistic field conditions associated with changes in physical liquid properties due to the characteristics of a formulation or adjuvant use when using the main types of agricultural nozzle as listed above.
Project Documents
• Final Report : The effect of formulation and adjuvant use on pesticide spray behaviour   (252k)
Time-Scale and Cost
From: 2000

To: 2002

Cost: £219,047
Contractor / Funded Organisations
Silsoe Research Institute (BBSRC)
Pest and Weed Control              
Pesticide use              
Plants and Animals              
Fields of Study
Pesticide Safety