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[Aroid-l] burnt soil - link to Amorphophallus Hewitii Dormancy

  • Subject: [Aroid-l] burnt soil - link to Amorphophallus Hewitii Dormancy
  • From: "Peter Boyce" peterboyce@myjaring.net
  • Date: Fri, 26 Aug 2005 07:46:09 +0800


Burnt soil is made by heaping a mound of moist (but not wet) clay-rich subsoil over a a wood fire. We do it here by digging a shallow pit (1m x 1m x 25 cm deep) filling it with wood (large branches, 4 x 4 off-cuts, &c) that is then set alight and allowing it to burn slowly for an hour (much as yu would set a BBQ) then carefully mounding the soil over the smouldering wood. The whole is allowed to burn for 2 - 3 days at the end of which the now semi-baked is removed and broken up. The final product is granular/small lump (1 - 2 cm) size. What it adds to the mix is a rich source of phosphates and microelements, some good structure (since the granular parts are quite hard) and also a source of silica.


----- Original Message ----- From: "Mike!" <Mike@MikeMiller.com>
To: "Discussion of aroids" <aroid-l@gizmoworks.com>
Sent: Thursday, August 25, 2005 9:16 PM
Subject: Re: [Aroid-l] Amorphophallus Hewitii Dormancy

Wilbert is absolutely correct. We find that none of the indigenous Bornean Amorphs are dormant for long. In fact, many species are effectively in leaf all the time in that a new leaf is emerging as the old leaf is in its final stages of senescence. We grow in coconut peat, coconut fibre, washed coarse sand and a small proportion of burnt soil, water copiously and also feed copiously. The minimum at the nursery here is 22 C (c. 72 F) and the maximum 34 C (c. 93 F).
Peter, can you speak to the "burnt soil" component of your potting medium? What does it add to the party? How is it prepared? Just guessing here, but is charcoal anywhere close to a reasonable substitute?

Thanks for the info,

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