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OfflineYrat
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Re: Heat stress caused damaged fan leaves (moved) [Re: Johnny420]
    #52291 - 06/06/08 08:37 AM (16 years, 8 months ago)

leave (heh) them on!

they're still photosynthesizing and producing food for the plant.  at worst, the plant will rescue the nutrients from the leaf and reuse them before allowing it to fall off naturally.


--------------------
"Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded." - Abraham Lincoln


"There are a thousand hacking at the branches of evil
to one who is striking at the root"
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OfflineYrat
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Posts: 886
Last seen: 11 years, 19 days
Re: Heat stress caused damaged fan leaves (moved) [Re: Johnny420]
    #52308 - 06/06/08 09:41 AM (16 years, 8 months ago)

thank you :gethigh:


--------------------
"Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded." - Abraham Lincoln


"There are a thousand hacking at the branches of evil
to one who is striking at the root"
~ Henry D. Thoreau
Strike The Root
                                                                                      :gethigh:

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OfflineYrat
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Registered: 04/20/08
Posts: 886
Last seen: 11 years, 19 days
Re: Heat stress caused damaged fan leaves (moved) [Re: coda] * 1
    #52538 - 06/06/08 05:03 PM (16 years, 8 months ago)

the reason a leaf turns yellow during N or Mg deficiency is because the plant redirects chlorophyll (a very energy-expensive molecule to produce) to the newer growth where it can be used more efficiently in brighter light.  so in this way nutrients can be taken up from older, even dying, leaves and put to better use.

in fact, chlorophyll is such a prized compound for plants that they store it over winter in their roots, removing it from leaves in the fall. When this happens we see the reds, yellows, and oranges of the secondary light-absorbing pigments that are left behind and normally go unseen during the regular season.

even just looking at the structure of chlorophyll (a) you can see why an N or Mg deficiency would result in decreased chlorophyll production, and thus lack of a green color


--------------------
"Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded." - Abraham Lincoln


"There are a thousand hacking at the branches of evil
to one who is striking at the root"
~ Henry D. Thoreau
Strike The Root
                                                                                      :gethigh:

Extras: Unfilter Print Post Top
OfflineYrat
Happy Planting
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Registered: 04/20/08
Posts: 886
Last seen: 11 years, 19 days
Re: Heat stress caused damaged fan leaves (moved) [Re: coda]
    #53027 - 06/07/08 12:17 PM (16 years, 8 months ago)

Quote:

coda said:
Quote:

even just looking at the structure of chlorophyll (a) you can see why an N or Mg deficiency would result in decreased chlorophyll production, and thus lack of a green color




interesting.

So, while that explains Mg and N, what about Zn and Fe (the other two most common causes of yellowing)?




metals such as zinc and iron are very common as catalytic centers in various enzymes, and i'm just guessing here, but they are most likely involved at many points along the chain of enzymes responsible for generating chlorophyll.  a deficiency in those metals would cut the production short and result in less chlorophyll output.


--------------------
"Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded." - Abraham Lincoln


"There are a thousand hacking at the branches of evil
to one who is striking at the root"
~ Henry D. Thoreau
Strike The Root
                                                                                      :gethigh:

Extras: Unfilter Print Post Top
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