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Macadamia nuts

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Graham Macklin starts with ...
I have a grafted macadamia nut tree which I planted approx. 9 months ago. Initially growth was ok but for about the last 6 months the leaves have turned a very light shade of green and any new growth/tips appear to be burnt/wind burnt. Water is not a problem as we have had our fair share of rain in recent times.About 2 months ago the tree was given a dose of Trace Elements. Can you plesae help or make some suggestions. Thank you.
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Graham Macklin
Brisbane
29th March 2010 9:52pm
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Jimmy says...
I had the same problem, I found that manganese was needed.
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Jimmy
Perth
30th March 2010 1:49pm
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Original Post was last edited: 30th March 2010 1:49pm
Graham Macklin says...
Thanks Jimmy. The Qld Dept. of Primary Industries has recommended Iron Chelate and also Dynamic Lifter so I'll see what results they bring.
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Graham Macklin
Brisbane
10th April 2010 9:21am
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amanda says...
Hi Jimmy - do u you know how sensitive to phosphurus macadamias are by any chance? I am always a bit nervous with fert's around my native fruiting trees?
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amanda19
Geraldton. WA
10th April 2010 12:50pm
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Brendan says...
Hi Amanda,
I was always told that a fertilizer high in phosphorus will kill a Qld Nut tree (aka macadamia:-), and even Aussie gum trees.

I'm careful not to give mine too much 'P'. As they are a rain-forest tree, they like a good drink tho. (don't we all?:-)
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Brendan
Mackay, Q
11th April 2010 8:27am
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amanda says...
Ta Brendan - I have been using manure, seaweed and a little blood n bone - so I will stick to that then...
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amanda19
Geraldton. WA
11th April 2010 11:02am
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Brendan says...
Hello Amanda,
I try to give mine some fertilizer every 2 months. I use something like 'organic booster', which is low in phosphorus & potassium, and just add some sulphate of potash. Mine bears like mad.

Just check that your blood & bone doesn't have too much phosphorus, it usually does. Yates B & B has an NPK of 8:5:1, which is fairly high in 'P', that's why I don't use it on my macadamia tree.
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Brendan
Mackay, Q
12th April 2010 8:27am
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amanda says...
Ah - thanks Brendan - they cost a small fortune so I don't want to kill them, they struggle a bit here as it is.
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amanda19
Geraldton. WA
12th April 2010 5:40pm
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Ed says...
Hello all; Hope you can shine a bit of light on my concern. I have a mature Macadamia tree which flowers like a beauty. Unfortunately, it only produces a hand full of nuts. The other concern is the leaves are a distinct yellow, almost as though they are lacking some element. I water on a regular basis and have tried various fertilizer types. The other concern is we have strong easterly’s. Obviously the main concern is the lack of fruit. If you can help with some advice it would be appreciated. Thank you Ed
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Ed3
Darling Range
12th September 2010 11:04am
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Original Post was last edited: 12th September 2010 11:18am
Brendan says...
Hi Ed,
Search top right of this forum for Macadamia Tree, some info there.

For the yellow leaves, try some epsom salts, one handful per sq metre under the canopy, and water in.

Is the tree mulched? They are a rainforest tree, and love mulch.

Also, to speed things up, mix 30g epsom salts to 4˝ litres water with a good wetting agent, and spray the tree twice weekly for 3 to 4 weeks, until they turn green :-)
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Brendan
Mackay, Q
15th September 2010 8:09am
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amanda says...
Ed - can u post a pic of the yellow leaves? Have you maybe overdosed it on phosphorus?
Phos toxicity on natives can produce yellow leaves also...
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amanda19
Geraldton Mid West WA
15th September 2010 7:29pm
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Annie57 says...
My tree lives in the chook pen. Would that have anything to do with the yellow leaves. I've thrown rusty nails into the soil and gave them a good dose of salts months ago but I've not seen an improvement
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Annie57
Katana Downs
13th January 2017 10:50am
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Diana says...
Annie57 yes they are one of those native plants that don't like excessive phosphorus, so it might be a bit much in the chook yard depending on chook density. A bit of composted poultry manure seems OK- loads of fresh maybe not. Mine are not too far from the chook yard and going well. Could also be climate if you don't live in SEQ or something else
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Diana
KENMORE,4069,QLD
18th January 2017 6:20pm
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