Effects of Girdling and Strangulation on Growth and Development of ‘Haak Yip’ Litchi
Date Issued
2009
Date
2009
Author(s)
Chen, Ming-Chih
Abstract
The materials for the first section of this experiment were potted ‘Haak-Yip’ litchi and the purpose was to discuss the effects of girdling and strangulation on ‘Haak-Yip’ litchi tree. Results indicated that both of two phloem disruption techniques restrained root growth, but root growth will not be affected 4.5 months after strangulation and after removal of the strangulating wire. Either girdling or strangulation reduced the proportion of vegetative bud burst and raised the proportion of quiescent apical bud. Two treatments also affected the allocation of nutrient and carbohydrate contents. Nutrient contents in leaves such as phosphorous, calcium and magnesium were reduced after treatments, whereas potassium was accumulated. Carbohydrates were accumulated in leaves above treating site but were reduced in roots due to phloem disruption. Reduction of photosynthetic rate occurred within two weeks after girdling and strangulating treatments. The materials for the second section of this experiment were ‘Haak-Yip’ litchi grown in economic orchard. The purpose was to discuss the effects of girdling and strangulation on fruit quality of litchi. Results showed that phloem disruption treatments, especially the girdling treatment, during full bloom stage inhibited fruit development. Girdling and strangulation executed at aril-occurring stage promoted fruit quality.
Subjects
Girdling
Strangulation
Type
thesis
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