Type of equipment: …………………………..Make and model: …………..………
Chemical product name: …………………………………………………………………..
Part A: Recordings (refer to the equipment manufacturer's charts and the chemical
label)
Step
1
2
Instructions
Details
What should the water application rate be (from
litres per
the product label) ?
Select the correct chemical application rate
(from the label).
This will usually be in mL or millilitres. There are
1000 millilitres in 1 litre.
3
Record the nozzle type and size (from the
equipment).
4.
Is there a required operating pressure (from the
label, and from the charts)?
If so, what is it?
This will be written as kPa (kilopascals) or bar
(barometric pressure). Both are different ways
of expressing pressure.
5
What is the tank size of your equipment?
6
Record how high you should hold the
equipment above the target.
mLs
per
type
size
Yes
No
kPa or bar
litres
……… cm above target
Part B: Calculating the water application rate
Details
Step
Instructions
7
Measure out an area 10 m x 1 m. This is 10 m2.
This is an area of 1/1000th of a hectare.
(1 ha = 100 m x 100 m or 10,000 m2 )
8
Time how long it takes to spray this area with
Time in seconds
water. Use the correct operating pressure (or a
constant pressure). Walk at a comfortable speed
and make sure to cover the whole area evenly.
9
Spray into a measuring jug for the same number
of seconds it took to cover the 10 m x 1 m area.
Record how much is in the measuring jug. This is
the output.
Output in litres
10
You can now multiply this number of litres by 10
to give a water application rate per 100 m2.
10 x ……………litres
(output)
= … litres per 100 m2
11
OR you can now multiply the number of litres in
step 9 by 1000 to give a water application rate
per hectare.
1000 x …………litres
(output)
= ………. litres per ha
Part C: Checking your calculations
Step
12
13
Details
Instructions
Does the water application rate comply with the
Yes
No
chemical label requirements?
If not, suggest a way to change this rate to achieve the required rate.
……………………………………………………………………………….
………………………………………………………………………………
………………………………………………………………………………
Type of equipment: …………………………..Make and model: …………..………
Chemical product name …………………………….
Part A: Recordings (refer to the equipment manufacturer's charts and the chemical
label)
Step
Instructions
Details
1
What is the minimum water application rate?
(Not all labels give a water rate for hand-held sprayers.
Leave blank if no rate given.)
L/ha
2
Select the correct chemical application rate from the label.
L/ha
3
Select a ground speed (walking speed) to suit the spraying
conditions.
(It must be realistic for the particular paddock conditions)
Note: For hand-held equipment use a slow walk (approximately 1
m/sec)
4
Record the nozzle type and size for the spray unit.
type
Check the rate the water comes out of the nozzle (rated water
size
output). Refer to the manufacturer’s nozzle chart.
Rated output = …… mL/min
5
Select and set spray operating pressure.
(Use the manufacturer’s nozzle chart as a guide.)
6
What is the tank size of your equipment?
7
Record how high you should hold the equipment above the target.
Slow walk
kPa
or bar
litres
m
Part B: Calculating actual ground speed.
To find out your actual ground speed measure a set distance, say 100 metres, then
time how long it takes to spray this distance. Make sure that the spraying conditions
are like those for the area that you will be spraying (e.g. hilly, rocky, flat, muddy).
These figures are then used to calculate actual ground speed as follows.
Step
Calculation
Actual
Ground
Speed
8
Distance covered (m) x 3.6
Time taken (seconds)
Answer
(
(
) x 3.6
)
= ……km/hr
Part C: Calculating actual water application rate
Step
Instructions
Details
9
Record output from nozzle for 1 minute by spraying into a measuring Total spray
jug.
output
Nozzle output = ……….. mL
…… L/m
10
Record actual effective spray width (how wide an area is covered
with spray).
…………… m
Now you can calculate the water application rate. Follow the steps below.
1. Copy the answers you worked out so far into the boxes below. You will need all
these numbers to do the calculations on this page. The numbers in brackets ( ) tell
you the step where the answer is from what you have already worked out.
Total Spray Output
Effective Spray Width
………….
litres/minute
(9)
……………
metres
(10)
Actual Ground Speed
…………….
km/hr
(8)
2. Work out the water application rate by putting the numbers above in the correct
place in the calculation below.
Water
Application
Rate =
Total Spray Output x 600
Effective Spray Width x Actual Ground Speed
(
=
=
(
(
(
)
)
) x 600
)x(
=
)
…..……… L/ha
Does this water application rate meet the chemical label
requirements?
(See Step 1 above)
Yes
No
If not, how could you change this rate to meet this requirement?
…………………………………………………………………………….………………………
…………………………………………………………………………….………………………
Part D: Calculating quantity of chemical required per tank
3. Now that you know the water application rate you can calculate how much
chemical you need to mix in each tank. Copy the answers you worked out so far into
the boxes below
Chemical Application Rate
……………litres/ha
(2)
Spray Tank Capacity
……………litres
(6)
How much chemical to
mix in each tank?
Chemical Application Rate x Spray Tank Capacity
Water Application Rate
(
)x (
(
=
………………litres
)
)