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KMID : 0903619850260020132
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Journal of the Korean Society for Horticultural Science
1985 Volume.26 No. 2 p.132 ~ p.139
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The Effect of Summer Pruning Strength and Nitrogen Fertilizer Level on the Growth and Chemical Composition of One - Year - Old Apple Trees Grown under Sand Culture
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Abstract
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This study was conducted to investigate the effects of summer pruning and nitrogen application on the plant growth and mineral composition of 1-year-old Fuji/M26 apple trees in sand culture. Two nitrogen levels and three pruning methods were tested. The results are summarized as follows:
1. Light summer pruning increased the number of lateral shoots and total shoot length of the Fuji apple tree. High level of N application also increased the number of lateral shoots but did not affect total shoot length.
2. Summer pruning reduced the dry weight compared with non-pruning; the effect of heavy pruning being more pronounced than light pruning. The dry weight was not affected by high level of N application.
3. Summer pruning raised the concentration of calcium but lowered those of nitrogen and manganese in leaves and shoot barks. Therefore both ratios of Ca/N and Ca/Mn were raised.
4. High level of N raised the concentration of nitrogen and manganese but lowered that of calcium. Accordingly the Ca/N and the Ca/Mn ratios were lowered.
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