บทคัดย่องานวิจัย

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Influence of early and late sprays of gibberellic acid on Lambert cherry quality.

Drake, S. R.; Kupferman, E. M.; Phillips, D. R.;

Tree Fruit Postharvest Journal Year: 1995 Vol: 6 Issue: 4 Pages: 15-17 Ref: 3 ref.

1995

บทคัดย่อ

Influence of early and late sprays of gibberellic acid on Lambert cherry quality.

 

were sprayed with GA at 20 p.p.m. either (i) when Bing cherries were turning straw colour or (ii) 7-10 days later, when Lambert cherries were turning straw colour. Fruits were harvested twice (7 or 1-2 days prior to commercial harvest). Quality was assessed immediately after harvest, after storage at 1 deg C for 14 days, and 24 h after transfer from storage to ambient temperature. GA application increased Lambert fruit firmness at harvest by 13 and 16% (early and late sprays, respectively) compared with unsprayed controls and resulted in lighter coloured fruits (with a higher Hunter L value). The late spray resulted in the lightest coloured fruits, and a delay in harvest resulted in reduced Hunter L values. Red colour was less well developed in GA-treated Lambert fruits than in control fruits but was still at an acceptable level. GA application had no effect on Lambert fruit size or soluble solids content. A delay

in harvest produced 6% larger fruits which had a 13% higher soluble solids content than earlier harvested fruits. GA-treated fruits had a lower acid content than control fruits; the loss in acid content was similar to the loss in acid content when harvest was delayed by 5-6 days. Results for Bing cherries indicated that GA application enhanced firmness and that the best firmness was produced when GA was applied early. Higher hue values were evident for Bing cherries when GA was applied early or late. Bing fruit weight was not affected by early GA application but was reduced when GA was applied late. Early GA application resulted in the greenest stems on Bing fruits. Overall the results indicate that GA application improved fruit quality and the best results were obtained when GA was applied at straw colour for each cultivar.