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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>G’day All,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>When I visited the Digester at Mead, Oregon, the operator was
quite proud of his “prize” vegetables planted straight in the digested solids
(they could drain, though, so it was not strictly in digestate liquid). I guess
if you plant many seeds in water (without the benefit of cotton wool for support)
they will also die. Many studies show improved plant performance for digestate
compared to both synthetic fertiliser and no addition.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Happy digesting,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>HOOROO<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>Mr. Paul Harris, Room 202 Charles Hawker Building, Faculty of
Sciences, The University of Adelaide, <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>Waite Campus, PMB 1, Glen Osmond SA 5064 Ph : +61 8
8303 7880 Fax :
+61 8 8303 4386<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>Roseworthy Campus, Ph : +61 8 8303 7929<o:p></o:p></span></p>
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color:#1F497D'><a href="mailto:paul.harris@adelaide.edu.au"><span
style='color:blue'>mailto:paul.harris@adelaide.edu.au</span></a> <a
href="http://www.adelaide.edu.au/directory/paul.harris"><span style='color:
blue'>http://www.adelaide.edu.au/directory/paul.harris</span></a><o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>CRICOS Provider Number 00123M<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> digestion-bounces@lists.bioenergylists.org
[mailto:digestion-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>Jim
McNelly<br>
<b>Sent:</b> Monday, 5 December 2011 3:09 PM<br>
<b>To:</b> For Discussion of Anaerobic Digestion<br>
<b>Subject:</b> Re: [Digestion] Digestate<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
<div>
<p class=MsoNormal>On Fri, Dec 2, 2011 at 9:38 PM, Murali Krishna <<a
href="mailto:bmkrishna6@gmail.com">bmkrishna6@gmail.com</a>> wrote:<o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:13.5pt;
font-family:"Comic Sans MS";color:#000066'>Good day Alex,<br>
<br>
Undoubtedly the spent slurry is the best nutrient source to plants/crops,
provided that necessary care is taken, and it is free from pathogens and in the
available form. </span><span style='font-size:13.5pt;font-family:"Comic Sans MS";
color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>SNIP</span><span
style='font-size:13.5pt;font-family:"Comic Sans MS";color:#000066'><br>
<br>
Krishna</span><o:p></o:p></p>
<p class=MsoNormal align=center style='text-align:center'><span
style='font-family:"Comic Sans MS";color:#000066'><o:p> </o:p></span></p>
</div>
<div>
<p class=MsoNormal>Krishna<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>This sounds nice, but the fact is that digestate is toxic to
plants. If you were to take digestate and try and plant seeds in it, none would
come up. You have to apply digestate at least five months into the soil prior
to planting seeds, at modest application rates to enable soil microbes to
further decompose the organic matter so that plants can grow. This means
apply in the fall to plant in the spring.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>You mention earthworms.... If you were to try to feed
digestate to earthworms, they would die within hours. As such the ASTM
Earthworm Contact Test would fail the anaerobically digested organic material
as unstable or unsuitable for unrestricted distribution.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>It is aerobically digested solids that plants like and
earthworms like; not anerobically digested solids. In my experience, organic
matter is best utilized by plants following aerobic digestion. <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Anaerobic digestion makes biogas. Aerobic digestion makes
plant food.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Your comments are correct as to the importance of organic
matter in the soil, but should be qualified as to whether or not these organics
are applied following anaerobic or aerobic digestion, and if anaerobic, then
with sufficient time in the soil for aerobes to convert the organics into
usable forms for plants.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<p class=MsoNormal>-- <span style='font-size:7.5pt;font-family:"Verdana","sans-serif";
color:#333333'><o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-family:"Verdana","sans-serif";color:#333333'>Jim
McNelly</span><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";
color:#333333'><o:p></o:p></span></p>
</div>
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color:#333333'><o:p> </o:p></span></p>
</div>
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