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  • From: João Pedro Moreira Gonçalves <joaovox@gmail.com>
  • To: permaculture <permaculture@lists.ibiblio.org>, Colectivo de Educação em Permacultura <edu-permacultura-pt@googlegroups.com>
  • Subject: [permaculture] Fwd: [biochar] Black leaves
  • Date: Mon, 14 Aug 2017 07:24:27 +0100

---------- Forwarded message ----------
From: Anand Karve adkarve@gmail.com [biochar] <biochar@yahoogroups.com>
Date: Mon, Aug 14, 2017 at 3:14 AM
Subject: Re: [biochar] Black leaves
To: biochar <biochar@yahoogroups.com>




It is difficult to express an opinion about the results of an experiment in
which I was not involved. The leaf temperature is the combined effect of
the air temperature, light absorbed by the leaf and the water evaporating
from the leaf. Since biochar induces plants to grow at a faster rate than
the control plants, I can speculate that the leaves of plants treated with
biochar have more photosynthetic pigments (chlorophyll and caretenoids)
than the control plants. If that is the case, they would absorb more light
and would have a higher temperature than the leaves of control plants.
Yours
A.D.Karve

***
Dr. A.D. Karve

Chairman, Samuchit Enviro Tech Pvt Ltd (www.samuchit.com)

Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)

On Mon, Aug 14, 2017 at 2:19 AM, erichjknight erichjknight@gmail.com
[biochar] <biochar@yahoogroups.com> wrote:

>
>
> Dear Dr. Karve,
>
> Given you know your plant physiology can you speculate about why Barry
> half up at blueleaf got slightly higher Leaf temperatures in his biochar
> trials?
> Thanks Erich
>
>
> Sent from my Sprint Phone.
>
> -------- Original message --------
> From: "Anand Karve adkarve@gmail.com [biochar]" <biochar@yahoogroups.com>
> Date: 8/13/17 6:29 AM (GMT-05:00)
> To: biochar <biochar@yahoogroups.com>
> Subject: Re: [biochar] Black leaves
>
>
>
> The chloroplasts also have some carotenoids (yellow pigments that absorb
> the blue wavelengths), which act as auxiliary photosynthetic pigments. The
> anthocynines shade and protect the chloroplasts from ultraviolet light,
> which would damage the chloroplasts. The chloroplasts were originally
> photosynthetic bacteria, which got incorporated into the plant cells. They
> have their own chromosome and genes. By treating germinating leaves with an
> antibiotic like streptomycin, one can kill the chloroplasts and produce
> plants entirely without chloroplasts. The leaves do get heated when they
> absorb light, but they evaporate water to keep themselves cool.
> Yours
> A.D.Karve
>
> ***
> Dr. A.D. Karve
>
> Chairman, Samuchit Enviro Tech Pvt Ltd (www.samuchit.com)
>
> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
>
> On Sun, Aug 13, 2017 at 8:52 AM, kchisholm@seaside.ns.ca [biochar] <
> biochar@yahoogroups.com> wrote:
>
>>
>>
>> Hi AD
>>
>>
>>
>> My understanding of the situation is as follows:
>>
>> 1: There are chloroplasts that can utilize solar energy in the 400 and
>> 650 nanometer wavelength range.
>>
>> 2: As far as I knew, only solar energy in this wavelength range could be
>> used in the photosynthetic process.
>>
>> 3: The presence of “darkening compounds” in the leaf would not improve
>> “leaf efficiency” unless the “darkening compounds” were actually
>> chloroplasts capable of converting sunlight and CO2 into carbohydrates.
>>
>> 4: If the “darkening compounds” were not able to “tie up” the extra solar
>> energy as carbohydrates, the net result could be simple “overheating” of
>> the leaf, and damage to it.
>>
>>
>>
>> I would very much appreciate it if you would be kind enough to correct
>> any errors or misunderstandings about what happens in a leaf.
>>
>>
>>
>> Thanks!!
>>
>>
>>
>> Kevin
>>
>>
>>
>>
>>
>> *From:* biochar@yahoogroups.com [mailto:biochar@yahoogroups.com]
>> *Sent:* Friday, August 11, 2017 11:31 PM
>> *To:* biochar <biochar@yahoogroups.com>
>> *Subject:* Re: [biochar] Black leaves
>>
>>
>>
>>
>>
>> Chlorophyll, the green photosynthetic pigment is often masked by other
>> pigments like anthocyanine. The black leaf colour is most probably due to a
>> very high concentration of blue or purple coloured anthocyanine. It would
>> certainly absorb all the wavelengths of visible light, but it would
>> actually impede the light reaching the chloroplasts and most probably it
>> would reduce the rate of photosynthesis.
>>
>> Yours
>>
>> A.D.Karve
>>
>>
>> ***
>> Dr. A.D. Karve
>>
>> Chairman, Samuchit Enviro Tech Pvt Ltd (www.samuchit.com)
>>
>> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
>>
>>
>>
>> On Fri, Aug 11, 2017 at 7:01 AM, thebgz@verizon.net [biochar] <
>> biochar@yahoogroups.com> wrote:
>>
>>
>>
>> I was told by a long-time biochar user that one of his trees had grown
>> black leaves. Black leaves could be highly energy efficient since they
>> absorb all wavelengths of light. Would anybody be able to draw a connection
>> between biochar use and leaf color change toward darker, more energy
>> efficient foliage?
>>
>>
>>
>> Robert W. Gillett
>>
>>
>>
>>
>
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__,_._,___



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  • [permaculture] Fwd: [biochar] Black leaves, João Pedro Moreira Gonçalves, 08/14/2017

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