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KMID : 0903619950360040506
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Journal of the Korean Society for Horticultural Science
1995 Volume.36 No. 4 p.506 ~ p.512
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Effects of Spray time , concentration and Volume of Dichlorprop on Preharvest Drop and Ripening in ´ Tsugaru ´ Apple Fruits
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Abstract
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This research was carried out to investigate the effect of different spray time, concentration, and volume of dichlorprop on preharvest drop and ripening in ´Tsugaru´ apple fruits. Preharvest drop was decreased at the concentration of 45.0 ㎎·L^(-1) dichlorprop much more than at 22.5 ㎎·L^(-1). No difference in preharvest drop was observed between spary volumes 5 to 10 liter per tree at concentration of 45.0 ㎎·L^(-1). However, at the concentration of 22.5 ㎎·L^(-1), 10 liter spray per tree was more effective on the inhibition of preharvest drop. There was no significant difference between spray times at the concentration of 45 ㎎·L^(-1). However, at the concentration of 22.5 ㎎·L^(-1) with 5 liter volume per tree, late spray (July 30) of dichlorprop decreased preharvest fruit drop than earlier spray (July 14 or 22). Flesh firmness was effectively further decreased at the concentration of 45.0 ㎎·L^(-1) than that of 22.5 ㎎·L^(-1). Flesh firmness was also more decreased at 10 liter spray at the high concentration, but no significant difference was found between the amount of spary at low concentration. Soluble solids content was highest at concentration of 45.0 ㎎·L^(-1) with volume of 10 liter per tree. In contrast, total acidity was lowest. Ground color of apple skin was further developed at the higher concentration of dichlorprop and spray amount.
Conclusively, we confirmed that the spray volume is also important as well as concentration of dichlorprop on the control of preharvest fruit drop and ripening of apples .
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