Calibration Exercise
Tick the unit calibrated / Backpack / Hand Gun
Chemical Trade Name
Chemical Label Rate (lts/ha)
Calibration Requirement / To calculate how much chemical to put in each backpack
Step / Instructions for a 15 Lt Backpack or hand held spray gun / Answers
1 / Mark out the 10 m2 area to test spray
Mark out an area of: 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 ) /
2 / Measure time to spray 10m2
Use the correct operating pressure (or a constant pressure). Walk at a comfortable speed and make sure to cover the whole area evenly.
Time how long it takes to spray this area with water. / Time in seconds
______seconds
3 / Measure output of spray nozzle used to cover 10 m2
Spray into a measuring jug for the same number of seconds it took to cover the 10 m2 area.
Record how much is in the measuring jug in mls.
This is the output in mls per 10m2 / Output per 10m2
______mls/10m2
4 / Calculate water volume needed per hectare
Multiply the number of mls in step 3 by 1000 to give a water application rate per hectare in litres.
(Note:- No of mls per 10 m2 = No of lts per ha ) / Output per hectare
1000 x ______mls
(output)
= ____ litres (water) per ha
5 / Calculate how many backpacks to cover 1 hectare
litres water per hectare ÷ Capacity of backpack (lts)
= No of backpacks / ______÷ ______
= ______Backpacks
6 / Calculate the chemical concentrate needed per backpack
Label Chemical Rate (lts/ha) ÷ No. of Backpacks
= Chemical Concentrate per backpack (lts)
(Note:- if this is a small number multiply by 1000 to convert to mls as 1000 mls = 1 litre) / ______÷ ______
= ______ltsper backpack
or______mls per backpack
Therefore if you put ______mls of chemical concentrate in a 15 lt backpack you will be applying the chemical at a rate of ______lts/ha (label rate)
SpraySMART
Calibration Exercise
Tick the unit calibrated / Backpack / Hand Gun
Chemical Trade Name
Chemical Label Rate (lts/ha)
Calibration Requirement / To calculate how much chemical to put in each backpack
Step / Instructions for a 15 Lt Backpack or hand held spray gun / Answers
1 / Mark out the 10 m2 area to test spray
Mark out an area of: 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 ) /
2 / Measure time to spray 10m2
Use the correct operating pressure (or a constant pressure). Walk at a comfortable speed and make sure to cover the whole area evenly.
Time how long it takes to spray this area with water. / Time in seconds
______seconds
3 / Measure output of spray nozzle used to cover 10 m2
Spray into a measuring jug for the same number of seconds it took to cover the 10 m2 area.
Record how much is in the measuring jug in mls.
This is the output in mls per 10m2 / Output per 10m2
______mls/10m2
4 / Calculate water volume needed per hectare
Multiply the number of mls in step 3 by 1000 to give a water application rate per hectare in litres.
(Note:- No of mls per 10 m2 = No of lts per ha ) / Output per hectare
1000 x ______mls
(output)
= ____ litres (water) per ha
5 / Calculate how many backpacks to cover 1 hectare
litres water per hectare ÷ Capacity of backpack (lts)
= No of backpacks / ______÷ ______
= ______Backpacks
6 / Calculate the chemical concentrate needed per backpack
Label Chemical Rate (lts/ha) ÷ No. of Backpacks
= Chemical Concentrate per backpack (lts)
(Note:- if this is a small number multiply by 1000 to convert to mls as 1000 mls = 1 litre) / ______÷ ______
= ______ltsper backpack
or______mls per backpack
Therefore if you put ______mls of chemical concentrate in a 15 lt backpack you will be applying the chemical at a rate of ______lts/ha (label rate)
Calibration ExerciseBackpack/Hand GunVer 01/2016