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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