Apple bruise resistance determination using an electrical universal bridge
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Agricultural University of Cracow, Department of Agricultural Production Technology, Ćwiklińskiej 2, 35-959 Rzeszów, Poland
Department of Biosystems and Agricultural Engineering, Oklahoma State University, Stillwater, OK 74078, U.S.A.
Acceptance date: 1999-09-27
Int. Agrophys. 2000, 14(4): 411-416
Electrical resistance measurements were correlated with bruises in apples generated by an impact load. Bruises were induced on all the apples by swinging a steel plunger to produce 0.3-0.9 J energy. Electrical resi- stance parameters and bruise parameters varied over four harvest dates and five storage periods. Two parameters, unit electrical resistance and electrical resistance difference appeared to be good indicators of apple bruise resistance. Gloster had smaller bruises and higher electrical resistance than Jonagold and Melrose.
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