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Invisiblecoda


Registered: 04/20/08
Posts: 4,736
Trusted Cultivator
Re: Heat stress caused damaged fan leaves (moved) [Re: Yrat] * 1
    #52474 - 06/06/08 02:31 PM (16 years, 8 months ago)

Quote:

The newest growth is a nice lush green, its the lower growth thats the problem. i'd say they're only 5% dried up and about 50% yellow/greenish colour on the edges. Still got dark green veins though.




Problems occurring in the older leaves is a sign of a mobile element problem.  If the yellowing is occurring on all parts of the leaf(ves) then it's a sign of an N def.  If the leaf(ves) is yellowing but leaving the veins green you have signs of a Mg def.

To fix the N problem feed with a solution rich in N.  To fix a Mg def. feed your plants some epsom salts or cal mag (or a product designed to give your plants Mg).

As for your other question, i say it depends.  Dying and diseased leaves are weak and prone to infections (or a further spread of a current problem).  I don't know where you heard the story about the nutrients, but, i call BS.  A dying leaf is counterproductive to good growth as it is leaching important nutrients from the soil that could go to better use with your more healthy growth.

So, if your tips and edges are a bit crispy, or, there's some slight yellowing etc. Leave em on there.  If you can give a nice healthy tug on the leaf and it stays attached its good to go.  That's how i test which growth stays and which doesn't.  Generally the dying or hurt leaves that are just hanging around will come off very easily, whereas you can literally bend your plant in half tugging on the healthy growth.  Also, if this is a problem really only occurring in the lower growth i would snip off the leaves that were more yellow then green.  Maybe wait until after you've solved the actual problem (if there is one, older leaves generally are the first to go anyways), because if you fix it and they green up again there's no reason to cut them unless you need to improve airflow or decrease your vegetation to allow more light in.


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MFDoom666: sobriety kills my buzz every time.

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Invisiblecoda


Registered: 04/20/08
Posts: 4,736
Trusted Cultivator
Re: Heat stress caused damaged fan leaves (moved) [Re: Harry_Ba11sach]
    #52820 - 06/06/08 11:40 PM (16 years, 8 months ago)

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)?


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MFDoom666: sobriety kills my buzz every time.

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Invisiblecoda


Registered: 04/20/08
Posts: 4,736
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Re: Heat stress caused damaged fan leaves (moved) [Re: Johnny420]
    #53004 - 06/07/08 09:28 AM (16 years, 8 months ago)

that would be best.


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MFDoom666: sobriety kills my buzz every time.

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Invisiblecoda


Registered: 04/20/08
Posts: 4,736
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Re: Heat stress caused damaged fan leaves (moved) [Re: erb]
    #53842 - 06/08/08 11:34 PM (16 years, 8 months ago)

Quote:

Also the soil is westlands multi purpose compost with added John innes. From what i read this has dolomite included in the mix and has a start PH of around 6.




that's some pretty damn acidic soil.  Did you buffer it all?  You generally want soil Ph to be around 6.8.


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MFDoom666: sobriety kills my buzz every time.

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Invisiblecoda


Registered: 04/20/08
Posts: 4,736
Trusted Cultivator
Re: Heat stress caused damaged fan leaves (moved) [Re: Johnny420]
    #54078 - 06/09/08 11:46 AM (16 years, 8 months ago)

6 is really, really pushing it.  I wouldn't want my soil going under 6.5.

Also, whatever you do right now, do NOT feed your plants any more Mg.  Here's why:

Soil

Magnesium gets locked out of soil growing at ph levels of 2.0-6.4
Magnesium is absorbed best in soil at a ph level of 6.5-9.1 . (Wouldn’t recommend having a ph of over 7.0 in soil) anything out of the ranges listed will contribute to a Magnesium deficiency.

If your problem is being caused by your Ph, you need to fix your Ph FIRST before doing anything else.  If Mg is being locked out feeding it more will not do anything but cause more issues.


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Invisiblecoda


Registered: 04/20/08
Posts: 4,736
Trusted Cultivator
Re: Heat stress caused damaged fan leaves (moved) [Re: Johnny420]
    #54160 - 06/09/08 02:10 PM (16 years, 8 months ago)

are you testing the run off?


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