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KMID : 0903620000410050517
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Journal of the Korean Society for Horticultural Science
2000 Volume.41 No. 5 p.517 ~ p.522
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Effects of GA Paste and Calcium Chloride on Tree Growth , Fruit Quality , and Storability of ´ Niitaka ´ Pears
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김영호/Kim, Young Ho
임상철/이철희/최관순/김선규/김학현/윤철구/Lim, Sang Cheol/Lee, Cheol Hee/Choi, Kwan Soon/Kim, Seon Kyu/Kim, Hag Hyun/Youn, Cheol Ku
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Abstract
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This study was conducted to find the effects of application time of 25 ㎎ GA_(4+7) paste (GA) to fruit stalk 25 days after full bloom (DAFB) and single, double or triple foliar sprays of 0.3% calcium chloride (CaCl₂) 50, 80, and 110 DAFB on tree growth, fruit quality, and storability of ´Niitaka´ pears. Shoot growth in length and diameter was increased by GA paste while CaCl₂ 50 DAFB single treatment resulted in growth reduction. GA increased the sugar content, while titratable acidity was increased by CaCl₂ 50 and 110 DAFB double treatment. Fruit firmness was lowest with GA and CaCl₂ 110 DAFB single treatment, while CaCl₂ 50 DAFB single treatment was most favorable for firmer texture, indicating the preference for earlier treatments irrespective of number of applications. Highest Ca content in fruit skin was observed with CaCl₂ 50 and 110 DAFB double treatment, while that of pit portion was highest with CaCl₂ 50 DAFB single treatment, followed by CaCl₂ 50 and 80 DAFB double treatment and CaCll₂ 80 DAFB single treatment. Leaf Ca content was in the order of CaCl₂ 50 and 80 DAFB double, CaCl₂ 50 DAFB single, and CaCl₂ 50 and 110 DAFB double treatment. Free sugars were composed of fructose, followed by glucose and sucrose. The highest content of fructose and glucose was obtained with CaCl₂ 50 and 80 DAFB double treatment while that of sucrose with GA tended to decrease by CaCl₂. Pattern of free sugar composition was in the order of fructose $gt; glucose $gt; sucrose, while the ratio was changed to glucose $gt; fructose $gt; sucrose by CaCl₂ 50, 80, and 110 DAFB triple treatment. Earlier application of CaCl₂ tended to decrease the incidence of physiological disorders during storage.
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KEYWORD
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