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KMID : 0903620010420020193
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Journal of the Korean Society for Horticultural Science
2001 Volume.42 No. 2 p.193 ~ p.196
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Effects of Foliar Application of NAA on Shoot Growth , Fruit Quality , and Return Blooming in Fuji Apple Trees
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Abstract
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The effects of NAA on shoot growth, fruit quality, and return blooming in following season of ´Fuji´ apple trees on M.26/seedling and M.9 were evaluated for one year in high density orchard system. NAA, at a concentration of 10, 20, and 30 ㎎·L^(-1) were sprayed from 70 days after full bloom with 1 week interval for two times application on ´Fuji´/M.26/seedling and NAA at a concentration of 10, 20, 30, and 40 ㎎·L^(-1) were sprayed from 60 days after full bloom with 1 week interval for three times application and from 70 days after full bloom with 1 week interval for 2 times application on ´Fuji´/M.9 apple trees. Shoot growth and regrowth rate were significantly decreased by two times foliar application of NAA on ´Fuji´/M.26/seedling and two or three times foliar application of NAA on ´Fuji´/M.9 apple tree. Fruit weights were increased by two or three times foliar application of NAA in ´Fuji´ apple on both rootstocks. Fruit firmness and soluble solids contents were higher than control in two times application of NAA on ´Fuji´/M.26/seedling, but there were no differences between NAA treatments and control in ´Fuji´/M.9 apple. The number of return blooming clusters was increased by foliar applications of NAA in ´Fuji´ apple tree on both rootstocks. With these results, we can estimate that 2 or 3 times foliar application of NAA at a concentration of 10 to 40 ㎎·L^(-1) can control the canopy size in high density orchard system.
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