Peach bruise thresholds using the instrumented sphere

• Published in: Applied engineering in agriculture Vol. 10; no. 4
• Main Authors: Lin, X. (Oklahoma State University, Stillwater), Brusewitz, G.H
• Format: Journal Article
• Language: English
• Published: 01.01.1994
• Subjects: DURAZNO; LESION; LESIONES; MADUREZ; MATURITE; MODELE; MODELOS; PECHE (FRUIT); TECHNIQUE DE PREVISION; TECNICAS DE PREDICCION; VARIEDADES; VARIETE
• ISSN: 0883-8542; 1943-7838
• DOI: 10.13031/2013.25880

Four peach cultivars ('Loring', 'Cresthaven', 'Jefferson', and 'Elberta') were dropped onto steel and onto a stationary peach of the same cultivar and similar maturity. The Instrumented Sphere (IS) was used with the fruit dropper at the same drop heights as the peach-to-steel test. Peach firmness was measured with an Effegi probe and ground color was measured with a color meter. Bruise size was measured 24 h after the peaches were dropped. 'Loring' peaches had the highest and 'Cresthaven' peaches had the least occurrence of bruises at the same drop height. 'Jefferson' and 'Elberta' had similar bruise probabilities. Soft peaches bruised with greater probability than the hard peaches. Color was less important than fruitfirmness in predicting bruise occurrence for certain cultivars. Equations were developed for the four cultivars to predict bruise probability and bruise size based on the IS peak acceleration and fruit firmness. For the same IS peak acceleration and fruit firmness, bruise size varied from 'Loring' (largest) to 'Elberta', to 'Cresthaven', to 'Jefferson' (smallest)