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KMID : 0903619940350020148
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Journal of the Korean Society for Horticultural Science
1994 Volume.35 No. 2 p.148 ~ p.154
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Effects of Dichlorprop Single , Mixed or Separate Sprays with Calcium Salts on the Ripening and Storage Potential of ´ Tsugaru ´ Apple Fruits
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Abstract
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This study was carried out to investigate the effects of mixed, separate or single spray of dichlorprop with calcium salts and the effects of different harvesting times of treated fruits on ripening and storage potential of ´Tsugaru´ apple fruits. Flesh firmness of fruits measured immediately after harvest for the fruits that harvested after 18 or 23 days from spray of dichloroprop was not severely decreased up to concentration of dichlorprop of 40 ㎎·1^(-1). When fruits were harvested after 28 days from spray of dichlorprop, the more dichlorprop concentrations, the less flesh firmness. The decreasing level was proportion to spray concentration. The difference in flesh firmness of fruits that hold 5 days at 20℃ after 20 days storage at 4℃, was not observed at any harvesting times until the spray concentration of dichlorprop of 20 ㎎·1^(-1) compared with that of untreated fruits, but the higher dichlorprop concentration, the lower flesh firmness. The soluble solids contents of the fruits sprayed with dichlorprop tended to be higher than those of untreated at all harvesting times. But no difference were observed in soluble solids at 25 days after storage. The difference in total acidity of fruits that harvested at 18 and 23 days after treatment of dichlorprop, was not observed compared with untreated fruits. But in fruits harvested after 28 days, the total acidity was decreased in dichlorprop concentrations of over 30 ㎎·1^(-1). When fruits were stored for 25 days, the later harvested fruits, the lower total acidity. When the mixed spray of dichlorprop with Ca-acetate or Ca-hydroxide, fruit softening was suppressed than single spray of dichlorprop, because decrease of flesh firmness and total acidity was delayed. The effects of separating spray of dichlorprop with Ca-acetate or with Ca-hydroxide, on the inhibition effect of fruit softening was lower than that of mixed spray.
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