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KMID : 0903619690050010001
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Journal of the Korean Society for Horticultural Science
1969 Volume.5 No. 1 p.1 ~ p.8
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Studies on Cause of Die Back of Shoot in the Young Apple Trees Planted in the Newly Developed Slope Land in Korea (2)
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Abstract
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The symptoms of shoot die back and rosette have been frequently encountered in young apple trees.
These disorders are known to be induced by the deficiency of boron.
In 1966 and 1967, three orchards that exhibited these symptoms and one healthy orchard were selected for the analysis of boron content in soils and trees.
Sand culture experiment of boron deficiency inducement was carried out in order to find out whether these symptoms are the same disorders found in the field.
In 1967, Borax was applied to the trees that have been suffering from disorders.
The results are summarized as follows.
1. Water soluble boron content in the soil showed that the ranges of 0.15 to 0.20 ppm in the damaged and 0.31 to 0.42 ppm in the healthy orchard,
2. Boron content in the leaves showed that the ranges of 9.5 to 25.5ppm in the damaged and 30.5 to 37.5 ppm in the healthy orchard.
3. Boron content in the bark showed that the ranges of 14.0∼25.5 ppm in the damaged and 30 to 33 ppm in the healthy orchard.
4. The symptoms of sand culture induced boron deficiency appeared to be the same symptoms that have been developed in the field.
5. These symptoms of die back and rosette were rectified effectively by the application of 10 to 30 grams of borax per tree.
6. It is suggested that these disorders are developed due to the deficiency of boron.
These disorders can be controlled by the application of small amount of borax.
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