8
NOTE: Higher working pressure means smaller drops = better cover-
age, but increased risk of wind drift.
Choice of nozzle size
If you want to change the standard nozzles of the spray lance by other
nozzles, it is very important that the pump is capable to feed the
nozzles wanted.
Spray Technique - see separate book.
Maintenance
In order to derive full benefit from the sprayer for many years the
following few but important rules should be kept.
Cleaning the sprayer
Guidelines
Read the whole label of the chemical. Take note of any particular
instructions regarding recommended protective clothing, deactivating
agent, etc. Read the detergent and deactivating agent labels. If clean-
ing procedures are given follow them closely.
Be familiar with local legislation regarding disposal of pesticide wash-
ings, mandatory decontamination methods, etc. Contact the appropri-
ate body, eg. Dept. of Agriculture.
Pesticide washings can usually be sprayed out on a soakaway. This is
an area of ground that is not used for cropping. You must avoid seep-
age or run-off of residues into streams, water courses, ditches, wells,
springs, etc. The washings from the cleaning area must not enter
sewers. Drainage must lead to a soakaway.
Cleaning starts with the calibration, as a well calibrated sprayer will
ensure the minimal amount of remaining spray liquid.
It is good practice to clean the sprayer immediately after use thereby
rendering the sprayer safe and ready for the next pesticide application.
This also prolongs the life of the components.
It is sometimes necessary to leave spray liquid in the tank for short
periods, eg. overnight, or until the weather becomes suitable for
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