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How to manage thatch in lawns

枯草会使您的草坪不牢固,不足以支持进行体育活动和其他活动,在最槽糕的情况下,甚至会枯萎并死掉。 这里是 Husqvarna 对枯草去除和枯草去除工具(如松土机)的一些建议。

Thatch is the layer of dead plant material that develops between the zone of green vegetation and the soil surface. If your lawn is ten years old, you most likely already have a 30-40 millimetre thick layer of thatch.

Where does thatch come from?

Thatch develops in your lawn when organic debris is produced faster than it can be broken down. This happens for a number of reasons. Some common causes are:
  1. 由于使用现代化超高效草品种造成草坪的密度太高。
  2. 由于土壤营养贫瘠并且草的生长层腐殖质水平较低造成生物活性低。
  3. pH 值过低,往往由于使用高酸性的肥料导致。
  4. 草的数量过多 – 比微生物所能处理的数量还多 – 由于过度施肥导致。

When is thatch a problem?

A thin layer of thatch can have beneficial effects on your lawn, providing it with a layer of insulation and resilience. But if the thatch layer exceeds 5 millimetres the function of the grass changes. As the water permeability gets worse, the roots grow closer to the surface and the root mass and the oxygen exchange decreases. As a result the grass becomes less durable and can no longer withstand sports and other activities. The risk of the grass dying increases and some grass varieties cannot survive.

The perks of removing thatch

Removing thatch gives a dense, competitive lawn with better oxygen exchange, greater water permeability, fewer weeds and a reduced risk of disease. This makes the grass much more durable, since the root mass grows and the roots grow deeper.

Professionell scarifier

When to get rid of thatch?

If you live in a part of the world where seasons change, thatch removal is best done in late spring or early autumn, when the grass is growing well. 避免在早春或干旱期清除枯草,因为此时微生物多,未受保护的根部会遭受更高的干枯风险。

Flail blades

Removing the thatch

Before you start dethatching, or scarifying to use another word, cut the lawn short and collect the clippings. Then choose the machine and the tools that work best for your type of lawn. For grass areas under 5,000 square metres, a scarifier with or without a collector is almost always used. For larger grass areas, use a tow-behind scarifying unit. These normally have direct, integrated collectors.

Spring tines

Flail blades and spring tines

A scarifier can be equipped with flail blades, which remove the thatch effectively. Their rotating blades should not go deeper into the soil than 1 to 2 millimetres, so the grass is not damaged. On sensitive areas, such as ornamental lawns, you can use the gentler method with spring tines, which should also not go deeper into the soil than 1 to 2 millimetres. The effect is less with flail blades.

Delta blades

Delta blades

You should use delta blades to cut off the lateral roots of the grass and to fight broadleaf weeds effectively. These blades should not go deeper into the soil than 7-10 millimetres but they are very effective. In warmer countries, scarifying with delta blades is an important way of improving the effect of watering. It ensures that the water penetrates to the roots of the grass.

After scarifying

When you’ve finished dethatching your lawn, remove the material that’s been pulled up. You can compost it, though it will take longer than other garden debris to break down, or put it in the yard waste collection. Then, for best results, it is a good idea to fertilize, top dress and water the lawn.


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