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Technical Question – when the level of nutrients are measured in the sap, is it the level of available nutrient for plant growth? Is it possible that some of the level tested may be oxidised and unavailable to the plant? E.G. Oxidised Fe or Mn?
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We believe that the results from sap analysis reflect only free and available nutrients in the plant sap. We have experienced tissue tests showing excessive levels of Mn or Fe while sap analysis showed deficiency and the plant showed visual deficiencies symptoms.
After applying reduced form nutrient via foliar spray the symptoms were reduced,…
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Yes I understand SAP cannot differentiate between oxidized Fe and Mn and plant available Fe and Mn. Also cannot differentiate Phosphite and Phosphate. I still see SAP as a useful tool to see difference between new and old growth and movement of mobile nutrients along with type of nitrogen that is in the plant.
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Nina replied to the discussion Phosphorous efficiency in the forum Broad Acre Crops 2 years ago
Reply to Phosphorous efficiency
I’ll shoot an email through to a couple of people to see if I can find a reply.
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Angus Ingram started the discussion Phosphorous efficiency in the forum Broad Acre Crops 2 years ago
Hi all,
We’re cropping a total of 4,000ha in Victoria and Southern NSW, Australia. We have a small area of 80ha growing Buckwheat for Japanese export under pivot. Apparently Buckwheat is good for solubilising P for the benefit of subsequent crops, we will wait and see on that one.
Something that I’ve come across is this product. Looks to have…
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Carlton Moore replied to the discussion Cover Cropping Series courtesy of TFSN – Thanks to John Kempf! in the forum Cover Crops 2 years ago
Reply to Cover Cropping Series courtesy of TFSN - Thanks to John Kempf!
Thank you as always…. so much gratitude!
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Carlton Moore replied to the discussion Cover Cropping Series courtesy of TFSN – Thanks to John Kempf! in the forum Cover Crops 2 years ago
Reply to Cover Cropping Series courtesy of TFSN - Thanks to John Kempf!
If you’re sick of me posting… Don’t woryy, I’m not going away unless you kick me out. 🙂
And if that happens, I’ll just share in 4 times as many places, 9 times a day… 🙂
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