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<pre>I don't know whats more stressed me or my trees! We have had
somewhat of a wet year. My trees have shown signs of water stress in
that the leaves have yellowed on (this is not so now and certainly
not on all trees). I believe that this process is something like:
roots are prevented from taking in oxygen, this effects
photsynthesis, this effects the production of chlorophyl, this
results in less green in the leaves hence yellow.

Now I have noticed recently that some of my trees leaves appear to be
lighter in their shade of green - these are not new leaves.

I will point out here that we are in a fairly heavy clay soil and
that we went from being very wet to very dry very quickly.

I am worried that I have not kept the water up to the trees, mainly
due to the above but also due to lack of maintenance on my irrigation
system (filter was blocked so that water was getting through at much
reduced pressure) and there is no mulch - haven't been able to get
into the fields until recently due to it being too boggy.

You may have noticed that I have been asking about how to measure
soil moisture well until last night I was not overly worried and knew
I would sort sothing out, but I have lost the first of my larger
trees (only just over 12 months in the ground) and do not want to
lose any more.

Appart from digging a hole in the ground to see what the water
penetration is like, what other options do I have to understand what
is happening?

I have a few questions:
Can anyone tell me what the symptoms of under watering are?
Should I look at alternative issues?
Could the lighter colour leaves and death of a tree be the inevitable
result of water stress last year?
Would leaf analysis tell me more- that is, if it is related ot
mineral defficiency or water?
How do I go about getting leaf analysis done is Victoria, Australia?

I know I am showing my ignorance but I'm up for the challenge.

Jon
Wallan, Victoria, Australia
</pre>
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<pre>Jon

Pivot do leaf analysis competently.

Regards
Peter Caird
www.victorianolivegroves.com
0418 392 157
</pre>
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<pre>Jon,

SWEP Laboratories is an independent organisation with over 20 years of
experience in soil, foliage and water testing. They have no products to
promote and provide a three page report (for soils).

Need more details? E-mail me privately on seagrow@dcsi.net.au

Regards,
Gerhard Grasser
Secretary, Gippsland Organic Livestock

AgriSolutions Pty Ltd
PO Box 81
Darnum VIC 3822
Australia.

Phone/fax 03 5627 8663
Mobile 0402 213 736

*** GreenTek non-chemical weeding systems
*** Soil fertility specialists - Albrecht principles
*** Independent soil, water & foliage testing
*** Kelp, seaweeds and fish for soil, plants and animals
*** Natural farming advisory service
----- Original Message -----
From: "Jon McDowell" <jmcdowel@csc.com.au>
To: <OliveOil@egroups.com>
Sent: 12 January, 2001 6:57 AM
Subject: [OliveOil] Stress and Leaf Analysis?


> I don't know whats more stressed me or my trees! We have had
> somewhat of a wet year. My trees have shown signs of water stress in
> that the leaves have yellowed on (this is not so now and certainly
> not on all trees). I believe that this process is something like:
> roots are prevented from taking in oxygen, this effects
> photsynthesis, this effects the production of chlorophyl, this
> results in less green in the leaves hence yellow.
>
> Now I have noticed recently that some of my trees leaves appear to be
> lighter in their shade of green - these are not new leaves.
>
> I will point out here that we are in a fairly heavy clay soil and
> that we went from being very wet to very dry very quickly.
>
> I am worried that I have not kept the water up to the trees, mainly
> due to the above but also due to lack of maintenance on my irrigation
> system (filter was blocked so that water was getting through at much
> reduced pressure) and there is no mulch - haven't been able to get
> into the fields until recently due to it being too boggy.
>
> You may have noticed that I have been asking about how to measure
> soil moisture well until last night I was not overly worried and knew
> I would sort sothing out, but I have lost the first of my larger
> trees (only just over 12 months in the ground) and do not want to
> lose any more.
>
> Appart from digging a hole in the ground to see what the water
> penetration is like, what other options do I have to understand what
> is happening?
>
> I have a few questions:
> Can anyone tell me what the symptoms of under watering are?
> Should I look at alternative issues?
> Could the lighter colour leaves and death of a tree be the inevitable
> result of water stress last year?
> Would leaf analysis tell me more- that is, if it is related ot
> mineral defficiency or water?
> How do I go about getting leaf analysis done is Victoria, Australia?
>
> I know I am showing my ignorance but I'm up for the challenge.
>
> Jon
> Wallan, Victoria, Australia
>
>
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</pre>
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<pre>Adding to Stan K I would urge that the testing lab be a NATA certified &
independent. Ask for a full macro & micro nutriment test & correlate it
with the soil test of 6 months prior for an idea as to what is going on.
If you can get a soil scientist who can make a site visit with a few
test holes all the better.

I had an experience with a fertiliser, guaranteed organic with soft rock
phosphate, coal dust etc etc. The before & after soil test showed
exactly nil increase in nutrient levels. The purveyor, despite being
full of knowledge at point of sale, became somewhat vague afterwards.
Another case reported in 'The Land' was of a farmer with drums of liquid
lime who tested before & after with nil result. A complete waste of
money, to the purchaser at least.

Roger Farquhar

[Non-text portions of this message have been removed]
</pre>
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<pre>Stan

Shouldn't natural attrition/shedding be also included?

Regards
Peter Caird
www.victorianolivegroves.com
0418 392 157
</pre>
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<pre>Dear All

Yellow leaves or yellowing leaves may be due to the following.

¥ Water logging
¥ Nutrient deficiency
¥ Disease - fungal, nematodes
¥ Cold and frosty conditions

You can eliminate nutrient deficiency by doing a leaf analysis

Stan Kailis
</pre>
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<pre>Dear All

The olive leaf lives for about 2 years. Such leaves turn a bright yellow
colour. These will be seen amongst the majority of healthy leaves. With
my last posting I indicated pathological causes of yellowing - in thes
cases the majority of leaves have yellow colouration.

I hope this helps

Stan
</pre>
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