heap of fresh mulch getting hot

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Subject Author Date
heap of fresh mulch getting hot kdv09 08-28-2008
Posted by on August 28, 2008, 10:57 pm
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Howdy!
We've got a heap of fresh mulch (trees were chopped three days ago)
The trees were mainly australian native bushy trees - no idea about
what they are called. The heap is a about 9 cubic meters and ~4-5 feet
high. This morning noticed a white steam rising, and sure enough, it's
warm inside. I dug about 3 feet into it and it's pleasant warm. I
understand why it's warm, what I'm worried about, is it dangerous at
all/ From what I see on the web, there were cases of much taller piles
of mulch selfigniting. It's midspring here in australia, temperatures
are 7-17'C, and even some chance of rain soon. How long it takes for
the mulch to cool down?
Many thanks
kdv09

Posted by Billy on August 29, 2008, 12:58 am
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In article
kdv09@excite.com wrote:

> Howdy!
> We've got a heap of fresh mulch (trees were chopped three days ago)
> The trees were mainly australian native bushy trees - no idea about
> what they are called. The heap is a about 9 cubic meters and ~4-5 feet
> high. This morning noticed a white steam rising, and sure enough, it's
> warm inside. I dug about 3 feet into it and it's pleasant warm. I
> understand why it's warm, what I'm worried about, is it dangerous at
> all/ From what I see on the web, there were cases of much taller piles
> of mulch selfigniting. It's midspring here in australia, temperatures
> are 7-17'C, and even some chance of rain soon. How long it takes for
> the mulch to cool down?
> Many thanks
> kdv09

If it starts feeling hot, spray some water on it. Hot is good because it
kills pests and weed seeds but fresh bailed hay or alfalfa has been
known to combust. A couple of minutes of the hose should do it.
--

Billy
Bush and Pelosi Behind Bars
http://www.youtube.com/watch?v=9KVTfcAyYGg&ref=patrick.net
http://www.haaretz.com/hasen/spages/1009916.html

Posted by on August 29, 2008, 1:18 am
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Ok, thanks for that! And I understand it would be a better mulch, if I
keep it for 2-4 weeks before using it on the garden beds, as fresh
mulch would consume some nitrogen from the soil while decomposing


> If it starts feeling hot, spray some water on it. Hot is good because it
> kills pests and weed seeds but fresh bailed hay or alfalfa has been
> known to combust. A couple of minutes of the hose should do it.

Posted by Frank on August 29, 2008, 7:32 am
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Billy wrote:
> In article
> kdv09@excite.com wrote:
>
>> Howdy!
>> We've got a heap of fresh mulch (trees were chopped three days ago)
>> The trees were mainly australian native bushy trees - no idea about
>> what they are called. The heap is a about 9 cubic meters and ~4-5 feet
>> high. This morning noticed a white steam rising, and sure enough, it's
>> warm inside. I dug about 3 feet into it and it's pleasant warm. I
>> understand why it's warm, what I'm worried about, is it dangerous at
>> all/ From what I see on the web, there were cases of much taller piles
>> of mulch selfigniting. It's midspring here in australia, temperatures
>> are 7-17'C, and even some chance of rain soon. How long it takes for
>> the mulch to cool down?
>> Many thanks
>> kdv09
>
> If it starts feeling hot, spray some water on it. Hot is good because it
> kills pests and weed seeds but fresh bailed hay or alfalfa has been
> known to combust. A couple of minutes of the hose should do it.

Compost heaps for nearby mushroom businesses were always catching fire.
I think this decreased when fire company started fining composter for
creating hazard.

Posted by David Hare-Scott on August 29, 2008, 3:02 am
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> Howdy!
> We've got a heap of fresh mulch (trees were chopped three days ago)
> The trees were mainly australian native bushy trees - no idea about
> what they are called. The heap is a about 9 cubic meters and ~4-5 feet
> high. This morning noticed a white steam rising, and sure enough, it's
> warm inside. I dug about 3 feet into it and it's pleasant warm. I
> understand why it's warm, what I'm worried about, is it dangerous at
> all/ From what I see on the web, there were cases of much taller piles
> of mulch selfigniting. It's midspring here in australia, temperatures
> are 7-17'C, and even some chance of rain soon. How long it takes for
> the mulch to cool down?
> Many thanks
> kdv09

As Billy said keep it damp (not wet). If you are really worried about a fire
spread it out and it will cool down. The deeper the pile the less surface
area (where heat is lost) in proportion to the volume (where heat is
generated). This is why you are advised, amongst other things, to build a big
pile (over a cubic metre) for hot composting.

Mid spring! You must be a banana bender.

David



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