Title: Evaluation of mechanical damage of Lady Rosetta potato tubers using different methods

Authors: Ahmed Mustafa Rady; Soliman N. Soliman

Addresses: Biosystems and Agricultural Engineering Department, University of Kentucky, Lexington, Kentucky, 40546, USA ' Department of Agricultural and Biosystems Engineering, Alexandria University, Alexandria, Egypt

Abstract: Instrumented sphere (IS) was utilised to evaluate several surfaces used in harvesting and handling potatoes (Lady Rosetta cultivar) by dropping the IS from 5 to 90 cm. The minimum dropping heights causing unallowable damage were 15, 15, and 25 cm on steel sheet, steel rods, and rubber-coated steel rods, respectively. However, the two-layer potato surface caused no unallowable damage in the drop height range of 5-90 cm. Tubers were dropped on the above surfaces and respiration (RR), bruise volume (Vb), and split area (As) were measured to assess the physiological behaviour after the drop test. The absorbed energy (Eab) was calculated for each dropped tuber and the results showed that steel sheet and steel rods resulted in higher RR and Vb values compared to the coated steel rods and potato surfaces. Regression equation of Eab with RR yielded fair performance for steel sheet and potato surfaces with an R2 value of 0.78 and 0.56, respectively. Regression of Eabwith Vb resulted in an R2 higher than 0.98.

Keywords: Lady Rosetta potatoes; instrumented sphere; impact recording device; IRD; respiration; bruise volume; mechanical damage; split area; peak acceleration; potato tubers; potato harvesting; potato handling; energy absorption; steel sheet; steel rods; coated steel rods; potato surfaces.

DOI: 10.1504/IJPTI.2015.074322

International Journal of Postharvest Technology and Innovation, 2015 Vol.5 No.2, pp.125 - 148

Available online: 22 Jan 2016

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