- Measure and work out the size of your home lawn using a tape measure or measuring wheel.
- Purchase a 5ltr Knap sack or 15ltr back pack sprayer based on your area size. The rule to thumb would be lawns under 125m2 get a 5ltr and home lawns between 125m2-500m2 buy a 15ltr back pack sprayer. The ones I sell come fitted with a fan nozzle used for quality control.
- We want to work out our output firstly over 100m2 so a few options would be to mark out a 10m by 10m (100m2), 5m by 10m (50m2) the double your answer, 2m by 10m (20m2) and times your answer by 5. You can do this on your grass or the driveway.
- Fill your sprayer right up to the top and know your mark. Do this with water only and proceed to evenly spray across your lawn sideways walking away from the spray. You should hold the nozzle 30cm off the ground and maintain a consistent pressure by pumping when needed. If you struggle to see you could add some food colouring as an indicator.
- After you have sprayed use a measuring jug to refill the sprayer back to the top measuring how much water was used over the area.
- The amount of water that you have to put back into the sprayer for example 3l over 100m2 is your H20 rate.
Every good product has a water rate in which the chemical needs to be mixed and applied with.
An example would be bow and arrow which Is a selective herbicide for weeds. It requires you put the chemical out in a water rate of 2-5l per 100m2. Now the chemical rate is 50ml per 100m2 which for my example above would mean I need 50ml of bow and arrow and 3L of water to complete the spray over my 100m2 lawn patch.
This is relevant to insecticides, fungicides and most importantly foliar fertilisers.
For any questions on sprayer calibration please send me an email at firstname.lastname@example.org
How to calibrate a sprinkler
How do you calibrate a sprinkler
- First determine your water pressure
- Get a bucket turn on your tap and time it running for 30 secs. A normal tap will do 7ltr per 30 sec so 14ltr per minute
- Then turn your sprinkler on and mark the distance it covers
- Turn the sprinkle off and calculate the area it covered
- Example 100m2
The rule of thumb is 1ltr of water dropped on 1m2 is equivalent of 1mm.
To get 3mm you would need 3ltrs of water.
Break the above down. Running the tap for 10 minutes will put out 140ltrs. 140ltrs over 100m2 is 1.4mm. to achieve 3 mm of watering you would need to run your sprinkler for 22 mins approx.
To simulate a 5mm rain event you would need to run your sprinkler for 36 mins approx.
In summer I thin our grass needs a minimum of 4 waters per week of 3mmm. 12mm in total for the week. To get more out of your grass obviously water more.
In winter the warm season grass is dormant and doesn’t require water though it is vital that you don’t let the roots dry out. I water every 3-4 weeks and usually simulate a 3-5mm rain event.
How to determine lawn army grub and insect activity
How to determine Insect activity
- Lawn appears to be yellowing
- Lawn appears to be dry
- Leaf turning yellow to brown
- Areas getting bigger by the day
- Castings appear under you eves outside
- Moths fly from your lawn when watering or cutting
- Birds (cockatoos) eating and ripping at your grass
What you can do to further investigate is
- Have a pull at the grass and see if there is any roots left holding it down
A sign that it pulls out easy is lawn grub or black beetle damage
- Get a warm bucket of soapy water and pour it over the affected area (use dishwashing liquid as the soap and the same amount you would use to wash the dishes.
Pour on the outside of the damage were the grass goes from green to yellow or brown.
Wait 1-5 mins and see what comes up.
- Paint dots around your brown or yellow patch and monitor to see if they get bigger or smaller.
Action to take if Insect damage is present
Purchase a knockdown insecticide to take control of your grub damage and then get onto a preventive like Tiram or Acelepryn to prevent them from ever coming back.
You will find both these products in lawn insects on my website
Repairing the damage
I would always repair damage with the high rate of 3.5kg of pro turf per 100m2. Fertilise fortnightly until the lawn is back to 100% health.
If your soil is hydrophobic look to also get a wetting agent to re- condition the soil.