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Post by americ on Jan 15, 2020 15:15:33 GMT -5
Hello everyone, I would be interested in hearing what different ways you have come across for reducing juvenility in citrus seedlings. Sincerely, Eric
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kumin
Full Member
SE Pennsylvania, 45 miles north of Chesapeake Bay, Zone 6b
Posts: 113
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Post by kumin on Jan 15, 2020 15:40:30 GMT -5
There are a number of suggested techniques, such as girdling the trunk when approaching maturity, training branches horizontally when reaching a prescribed height, keeping and forcing a central leader. Some practical things, encouraging vigorous growth, and above all never pruning, or restricting top growth. There's a school of thought that emphasizes apical node count, which is an emphasis on the number of nodes, or leaf axes starting from the cotyledons and following the central leader to the top, only the main line of stems' nodes is counted, not the whole tree.
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brian
Full Member
Pennsylvania zone6 w/ heated greenhouse
Posts: 158
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Post by brian on Jan 15, 2020 15:53:27 GMT -5
I dont have the article on hand but in Spain a team was able to use CRISPR to induce flowering in young seedlings. This isnt something you can do at home though.
If the node count explanation is true, it seems like you could grow a seedling into spiral vine by removing all side shoots to try to reach a high node count earlier. I want to try thid but Indont have space for it
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Post by Sylvain on Jan 15, 2020 18:53:53 GMT -5
When the tree reaches a reasonable size, stop watering until the first drop of a leaves and then water and feed. It often induce a bloom.
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Post by radoslav on Jan 16, 2020 6:38:25 GMT -5
When the tree reaches a reasonable size, stop watering until the first drop of a leaves and then water and feed. It often induce a bloom. This is called "Verdelli practice". On other hand, the main method in Japan is high grafting in to the crown of old tree (at least 3m high).
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Post by mikkel on Jan 16, 2020 9:22:27 GMT -5
Top working of new hybrids in South Korea
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Post by Sylvain on Jan 17, 2020 6:40:57 GMT -5
In girdling methods there are several ways, physical girdling and grafting top down. In the last one you cut a circular strip from the trunk and regraft it at the same place but up side down.
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till
Full Member
Posts: 156
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Post by till on Feb 20, 2020 3:30:28 GMT -5
Has anybody tried to graft juvenile seedlings onto precocious Poncirus? I had a precocious Poncirus (from Laaz) that bloomed as a tiny seedling. Growth was very slow so I grafted it onto a little normal Poncirus where growths was normal. But it is now the third year and it has never flowered again. For me, that is a strong indication that early flowering in Laaz-Poncirus has something to do with the root system. All precocious Poncirus seedlings on their own roots were blooming every year from early ago on. So could it be that anything you graft onto precocious Poncirus blooms immediatelly? I tried the experiment but had bad luck with the skion. I am going to try it this year again.
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Post by ilya11 on Feb 20, 2020 3:57:23 GMT -5
I think your seedling was not true to type, only around 20% or precocious poncirus seedlings flower in a first year on their own roots.
I grafted one 6 month old seedling on a regular poncirus and it was flowering the same season.
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Post by Laaz on Feb 20, 2020 5:46:23 GMT -5
I have nearly 100% flower in the first year. I have some already flowering now.
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Post by david on Feb 20, 2020 9:25:59 GMT -5
I too have precocious poncirus (from Lazz) flowering now. I think I have tried all the processes to induce faster flowering in various citrus (exception girdling tree) and I have found no appreciative quickining in any method. I have concluded that it is a combination of factors that cause flowering. So many varibles......even amount of agreeable temps to trace element availability.
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Post by millet on Feb 20, 2020 12:51:31 GMT -5
I think David is 100% correct. If their actually was a reliable method of promote faster flowering, except CRISPR, it would have been in use long ago.
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till
Full Member
Posts: 156
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Post by till on Feb 24, 2020 14:55:18 GMT -5
That will be the truth. Still, I shall make my grafting experiment with precocious Poncirus, also. I am just curious.
To be exact: No precocious Poncirus, that I have, flowered in the first year from seed. But in the second year, i. e. after the first winter. Flowers were very tiny, undeveloped und infertile, yet it were flowers.
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Post by lebmung on Apr 3, 2020 14:31:03 GMT -5
I am going to use PT rootstock with a shiikuwasha interstock and also only shiikuwasha rootstock from mature tree cuttings. In Japan a leading research station gets flowers after 2 years and a half for an unbranched tree with a long stem of 3m.
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Post by millet on Apr 3, 2020 21:43:01 GMT -5
The precocious PT that I got from Laaz flowered and produced one fruit the first year. This year (2nd year) the flowering is much heaver.
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