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KMID : 0903619710100010049
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Journal of the Korean Society for Horticultural Science
1971 Volume.10 No. 1 p.49 ~ p.58
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Effects of Temperature , GA , and Nitrogen Applications on Flowering and Yield of Several Strawberry Varieties in Relation to Their Total Sugar and Nitrogen Contents
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Abstract
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In order to investigate the effects of high temperature, and foliage applications of N, GA after floral differentiation on the content of total sugar and nitrogen of strawberry plants in relation to their flowering and yield during the unsuitable growing season, the present studies were made. The results obtained are summarized as follows;
1. At the time of floral differentiation, the total sugar content in leaves was increased, whereas the total nitrogen content was decreased. At the later stage, the nitrogen level was gradually increased in the leaves.
2. Everbearing varieties, Ozark beauty and 20 century, showed highest in total sugar content among the varieties examined during the floral differentiation period.
3. Total sugar/total nitrogen ratio was observed most at the stage of floral differentiation, and everbearing varieties showed highest value as compared with other varieties.
4. High temperature treatment after floral differentiation reduced the total sugar and nitrogen contents, and similar results were observed for the treatments of GA and GA+N. The leaf area and berry yield both were increased by the chemical treatments.
5. GA(50ppm) and heat treatments at pre-dormant stage promoted flowering. Heat treatment after floral differentiation encouraged early fruiting. Significant yield increase was observed with treatments of GA and GA+N.
6. No influence of heat treatment on the total fruit yield was found after floral differentiation, whereas yield increase was obtained with the nitrogen spray. Particularly nitrogen application with GA resulted in significant yield increase.
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