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Thatch Problems

Rootbreak is a common feature on greens where thatch is out of control

As bowling green maintenance specialists we get lots of questions every week about thatch. So here is a quick crash course on it; what it is, what it does and how to deal with it:

What is it?

Thatch is the name given to the mat of dead roots and shoots that accumulates on the surface of the green. Where moisture, nutrition and cultural practices are optimised for the desired grasses, thatch rarely becomes a problem. However, when soil air content is low, or if drainage is poor and the fertiliser program is not Read more

a lot of hot air?

Air is a very important component of a Performance Bowling Green.

50% of a healthy, performance green will be air; 25% Micro-pores and 25% Macro-pores.

The Macro Pore or “aeration” space is where drainage happens.

The Micro-Pore or “capillary” space is where grass plant roots get their water and nutrients.

Tip the balance in favour of one or the other of these and things start to go wrong.

Compaction reduces the Macro air space in soil and inhibits drainage and root penetration. The soil now holds on to too much moisture and a whole raft of other problems ensue; particularly the build up of excessive thatch due to the anaerobic (lacking in oxygen) soil conditions brought about by the reduction in air space.

Thatch becomes a breeding ground for fungal disease and a base for Localised Dry Patch to take hold. The thatch doesn’t break down naturally as it should because there is a massive reduction in the population of aerobic soil microbes and they usually do this job.

Tip the balance the other way by applying excessive amounts of sand top-dressing and there is now too much air space, there is very little capillary space and the green starts to dry out too quickly. Localised Dry Patch now takes over, the surface is unpredictable and the soil can’t provide the nutrition the plants need naturally any more.

Yes, for a healthy living green that performs to order you need a lot of space; 50% air space.

Luckily, a healthy living soil knows how to do all of this without us.

We are only needed to help rectify the damage we inflict, which is mainly compaction and nutrient depletion through the removal of grass clippings.

Ahh! how simple!

ecology

Bowls Greens don’t have beds!

I often hear the phrase “putting the green to bed” at this time of year.

It is the most frustrating thing to hear because I don’t know of any club that can afford the luxury of stopping work on the green now.

The autumn and winter period is the most important time to get on top of a range of big problems that blight bowling greens.

For example Thatch encourages diseases such as fusarium, insect pests like leatherjackets and chafer grubs and contributes significantly to the onset of Localised Dry Patch the modern scourge of bowling greens throughout the UK. As if that wasn’t enough excessive thatch also saps the speed from your green and causes heavy, unpredictable rinks, contributes to un-even surfaces, causes bumpiness and bad rinks, reduces the efficacy of fertilisers and encourages weed grasses such as annual meadow grass to predominate the sward.

Then there is Compaction which impedes natural drainage, causes shallow rooting of grasses (which leads to skinning on heads), impedes irrigation and rain penetration and causes root break. And that’s before we even consider its expertise at encouraging weed grasses such as annual meadow grass, its ability to severely reduce the efficiency of irrigation, efficacy of fertilisers and its major contributory role in the creation of un-even surfaces and loss of grass cover on edges and heads.

If you only deal with these two issues this winter you will have gone a long way towards creating a performance green; they won’t go away by giving the green “a rest”.

I recently uploaded a new 18 page special report on autumn and Winter Maintenance of the Bowling Green to the Shop which shows you how to deal with thatch and compaction this Autumn and Winter as well as a host of other problems like Insect Pests, Fungal Disease, Localised Dry Patch and Moss.

Localised Dry Patch Update

LDP Affected green after heavy rain

Already the relatively dry April and start to May has seen bowling greens suffering from Localised Dry Patch (LDP).

As we have discussed many times on this site before, this condition is a major problem for bowling clubs throughout the UK and if your bowling green is aready showing the tell tale signs then you need to take rapid and relentless action to avoid major disruption to your bowling green surface this season.

Meantime for greens already showing signs of the problem here is my Read more

The great top dressing hoax

Top dressing with high sand content composts has become a tradition in bowling green maintenance but it is far from beneficial.

  1. After 3 decades of routine top-dressing most greens are “inert” and can’t support a population of beneficial soil microbes.
  2. Soil microbes break down thatch and release nutrition to the turf.
  3. High sand and thick thatch usually result in Localised Dry Patch which is a long lasting, devastating condition that causes the soil to repel water.
  4. The surface smoothing and levelling actions of top-dressing are massively over-sold and of very little relevance to producing a smooth, fast green.
  5. Most bowling green irrigation systems are inadequate to start with, but are completely useless in the face of localised dry patch.

The process of top-dressing a bowling green has become so ingrained in our maintenance practices that it is hard to find a club that doesn’t do it, but over the decades it has devastated a huge number of greens in the UK.

Do your green and your wallet a favour and break the habit this year.