MULTI-PURPOSE CDA SPRAYER DEVELOPMENT
MULTI-PURPOSE CDA SPRAYER DEVELOPMENT
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Date
1994-09
Authors
MAIWADA, LIMAN SULEIMAN
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Abstract
A multi-purpose spinning disc controlled droplet
applicator (CDA) has been developed. The sprayer takes care
of spraying applications for different needs such as:
Insecticide/fungicide spraying, Herbicide spraying and even
tree crop spraying eliminating the need for having different
spraying machines.
The machine was developed by modifying the conventional
(CDA) sprayer to produce different sizes of droplets achieved
by change of sprayer motor voltage and the change of sprayer
configuration to provide for adjustment for tree crop spraying.
An alternate power source was also identified as being more
superior to conventional U2 batteries.
Laboratory evaluation of the prototype revealed that the
sprayer was capable of producing insecticide/fungicide droplets
of 82 micron volume median diameter (vmd) at 600 rpm disc
speed when the input voltage was set at: 12V and Herbicide
droplets of 285 micron vmd at 2500 rpm when set at 6v. Spray
volume distribution pattern tests revealed a decrease in the
Coefficient of variation of spray with decrease in input
voltage. The dispersion ratio range between 1.22-1-30 which
are within acceptable limits for cda spraying.
Field tests revealed an application rate of 7.2 L/ha
for insecticide/fungicide and 24 L/ha for herbicide sprayings
with spray droplet densities Of 236 and 19 droplets per
square centimeter respectively. The maximum vertical height
reached by droplets during tree Crop Spraying was 8 metres.
Power consumption tests revealed an average consumption
of 16.1 watt at 12 volt during Insecticide spraying and A.6
watt at 6 volt during Herbicide application. Annual spraying
operating power cost with the modified power source was below
20% of that when conventional U2 batteries were used. The
above in addition to higher field capacity, versatility, and
better spray droplet spectra due to relatively constant
operating voltages were some of the merits of the new prototype
sprayer design.
Description
Department of Agricultural Engineering
Faculty of Engineering
Ahmadu Bello University, Zaria
A Dissertation Submitted to the
Postgraduate School,
in fulfillment of the requirements
for the degree of Doctor of Philisophy of
Ahmadu Bello University,
Keywords
MULTI-PURPOSE,, CDA SPRAYER,, DEVELOPMENT