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KMID : 0903619730130010083
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Journal of the Korean Society for Horticultural Science
1973 Volume.13 No. 1 p.83 ~ p.90
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Effects of Preharvest Applications of Ethephon on Maturity and Quality of Three Apple Cultivars
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심경구/Kyung Ku Shim
김몽섭/김종천/Mong Sup Kim/Chong Chon Kim
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Abstract
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2-chloroethylphosphonic acid (Ethephon) was applied alone and in combination with NAA or fenoprop on the three apple cultivars. Apple trees with ethephon applications at 400㎎/ℓ, plus NAA at 10㎎/ℓ for abscission control, approx. 1 month before optimum maturity exhibited increased fruit coloration.
On some cultivars, fruit firmness, soluble solids, acidity, and soluble solid-acid ratio were altered. Ethephon accelerated red color development and hastened maturity of ´Jonathan´ and ´Delicious´ apples by approx. 10 days. In ´Ralls´ there was little difference in results. Ethephon reduced the titratable acidity of ´Jonathan´ fruit resulting in a greater soluble solid-acid ratio. Ethephon treatments applied without an accompanying abscission control chemical resulted in fruit abscission within 7 days by 80% in ´Jonathan´, 29% in ´Ralls´, respectively.
Ethephon sprays do not appear to affect the storage quality of ´Jonathan´ and ´Ralls´. However, ethephon sprays slightly affect the fruit firmness of ´Delicious´ during storage.
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