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Combatting Dry Patches In Your Lawn
Courtesy of lawndoctor.com
Dry Patches in your Lawn
There are a number of issues that need to be addressed if your lawn is going off in summer. They can occur individually, or as an interrelation between two or more of them. The reasons have been listed in order of priority.
Fertlising & Mowing
Beetles (pests) and funguses
The first cause is a retic system that is not giving adequate coverage. Likely reasons are blocked / broken/ misaligned sprinklers, change in pressure or sprinklers that have been replaced and don’t match the system. You check retic systems by finding out how many millimetres of water are being applied during each watering time. The pressure is measured by putting aerosol caps around your system and measuring the amount of water in each. If watering twice a week you need a minimum of 15mm in normal conditions and 20mm during a heat wave per watering (so 30mm and 40mm spread over your watering days per week). These figures will let you know how long to run each station to get the required amount of water (stations may vary depending on pressure and sprinkler type). Different types of sprinklers put out vastly different amounts of water. Contrary to public perceptions, there is no time limit to how long each station runs for, as long as you water within your allocated watering day and time. Consideration must be given to drift from prevailing winds. Once you haveaudited your retic system and it is working satisfactorily you can look at the non wetting properties of your soil (hydrophobia).
Hydrophobic soils repel water and this doesn’t allow for even distribution of water. The water makes runnels, following down through easier penetration areas, over wetting some areas and completely missing others. This is a natural occurrence in our dry, waxy sandy soils. So, if your retic system is working efficiently and you are still having problems with a dry lawn, use a spade to cut out a square of lawn 100mm deep from the stressed area. You can then compare it with an area of healthy lawn. If it is drier, you probably have hydrophobic soil (at the same time you can check for beetles and grubs). Applying a good quality wetting agent such as Bailey’s Gro Sorb, Soil Soak or Aqua Soak before the first heat wave and reapplying as required will improve and even out the water penetration through your lawn.
Fertilising / Mowing
Lawn should be fertilised lightly every 6 to 8 weeks with a quality fertiliser such as Sir Walter Buffalo Fertiliser, Knights Special Mix or Baileys. This should continue even into winter to keep your lawn green and vigorous when others have gone dormant. A tonic of iron, manganese and nitrogen sprayed on the leaf does wonders. This is available at Knights.It is important that your lawn is mowed at a suitable height (above 20mm and higher in shade). This helps the lawn to keep its vigour and minimises porpoising (when the runners leap over each other due to the lawn being scalped). Scalping also stresses the lawn as it doesn’t have as much surface area in the leaf to retain moisture and promote photosynthesis and it is a known fact that the length of the leaf has a direct relationship to the length of the roots (longer roots make the lawn more drought tolerant). Sir Walter can also be mowed with a rotary type mower.
Beetles (Pests) and Fungus
Pests (black beetle etc) and funguses (virtually unheard of in Sir Walter but more prevalent in other buffalo types) can also be the cause of problems with your lawn, however these add up to less then 1% of turf related problems. You can check for beetles by soaking an area of a metre square by holding the end of your hose 150mm below the surface for several minutes and seeing how many float to the top. If you get 20 or more you may have a problem and can treat with a suitable pesticide (we can help you with this). Funguses can also be treated with a suitable garden fungicide such as Fongarid or Mancozeb plus depending on the type.
Some lawns do become compacted. Like us they need air. Opening up the ground (de compacting / aerating) with a sturdy pitchfork (pushing it in and working it backwards and forwards) is one way in a small lawn or you can hire a corer from a garden hire company such as The Hire Guys. This will allow for air to circulate through the lawn and make it easier for water to penetrate.
Finally spills including fertiliser, chlorine, petrol, bbq fat over proof rum will damage the lawn. Other secondary problems can be excessive thatch, dog urine and builders slurry (lime and mortar washed out of concrete mixers etc during building). Also, all lawns have a flowering and seeding time.Buffalo lawns flower in late spring and can occur more prevalently in a new or stressed lawn. Any problems can be minimised (or even eliminated) by checking the above points and you should be well on the way to having the best lawn in the street.
There are THREE GROUND RULES TO A HEALTHY LAWN.
Regular dusting of fertiliser.
Regular mowing at 25mm – 30mm all year round.
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