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Determine the speed of
operation or forward speed
of operator
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Find the time required to spray 1 ha
(hrs)
Measure an area (e.g. 10 m X 20 m = 200
m2)
Fill the sprayer with water and spray the200 m2
Walk steadily at a constant speed
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Record the time (minutes)
spent to spray the 200 m2 plotCalculate the amount of time
needed to spray 1 ha.
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5 min = time spent to spray
200 m2
Example
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Time needed to spray 1 ha
(5 min) X 10,000 m2
= -------------------------------200 m2
Example
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(5 min) X 10,000 m2
= -------------------------------
200 m2
Example
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(500 min / 60 min/hr)
= --------------------------------
2
(8.33 hrs)
= ------------------------ = 4.16 hrs
2
Example
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Determine nozzle discharge andamount of water needed to spray
1 ha.
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Find the amount of water needed to spray 1
ha (liters)Fill the sprayer with water (about 5 liters)
Work the pump to accumulate maximum
pressure
Collect water discharged from the sprayer in a
container for 1 minute
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Measure the amount of water delivered by the
sprayer in 1 minute (repeat 3-4 times and get theaverage amount of water discharged by the
sprayer)
Calculate the volume of water that the sprayercan deliver using the result of the discharge trial.
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Example
the amount of water discharged was
800 ml (0.8 liters)/minute
Use the time needed to spray 1 ha
calculated above.
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Example
Amount of water needed to spray 1 ha
= 0.8 L/min X 60 min/hr
= 48 liter/hr x 4.16 hrs= 199.68 or 200 liters
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Example
Ifthe sprayer capacity is 16 liters then you
will apply 12.5 spray loads for 1 hectare (seebelow):
200 liter/ha
= -----------------------------------
16 liters (sprayer capacity)
= 12.5 spray loads/ha
No. ofsprayloads needed
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