b'Andys Advice:Storage Trial Results For The North Dakota Fresh Market Potato 2020 TrialBy Dr. Andy Robinson, NDSU/UMN Extension Potato Agronomist and Dr. Darrin Haagenson, USDA Plant Physiologistwith 95% relative humidity and andependingonwhichvarietyyou airflowof1.5cfm/cwt.Apressurehave experience with on your oper-plate was used to provide pressureation.Differencesinthedatafor byincrementallyincreasingthepressure flattening and weight loss pressureuntilitreached2.1were found for the red- and yellow-lb/inch2tosimulatepilepressure.skinned potatoes (Table 1 and 2). It Subsampleswereharvestedonis interesting to note that there was September10,2020andplacedinanegativecorrelationofpercent thechamberonSeptember11,weight loss by tuber diameter, or in 2020.Yellow-skinnedtuberswereother words the larger tubers had a removedonFebruary9,2021andlower percentage weight loss, while red-skinnedtuberswereremovedsmaller tubers had a higher percent-on February 24, 2021 for evaluation. age of weight loss. Two trials were conducted, one forAsexpected,weightlossincreased In2020wetested21red-skinnedredpotatoesandoneforyellow and 30 yellow-skinned cultivars orpotatoes.Forthered-andyellow-advanced selections in two differentskinnedpotatotrialsfivetubers trials. The yield results for these tri- fromeachreplicate(atotalof20 alscanbefoundatz.umn.edu/tubers for each clone) were placed Potato2020orsearchforNorthin small mesh bags into a pressure DakotaFreshMarketPotatobruisechamberdevelopedbyDr. Cultivar/SelectionTrialResultsforDarrin Haagenson at the USDA-ARS 2020.Aspartofthesetrials,subPotato Worksite.samplesoftubersharvestedwere placed into a post-harvest pressureAfterremovingthetubers,they bruise storage test at the USDA-ARSwereweighed,steampeeled,and PotatoWorksiteinEastGrandthenumberandsizeofpressure Forks, Minnesota. bruisesweremeasured.Standard grown cultivars were used as checks The pressure bruise chambers wereto benchmark other tubers, such as setup to simulate storage in a com- RedNorland,DarkRedNorland, mercial potato bin. Following a peri- RedPontiac,andSangre.Forthe od for wound healing, the tempera- yellowsabenchmarkcouldbe turewasslowlyreducedto42FActrice,Agata,JellyorMilva,Image1.Setupofpressurebruise tower.12 POTATO GROWER NOVEMBER/DECEMBER 2021'