b'Andys Advice:Storage Trial Results ForThe North Dakota Fresh Market Potato 2019 TrialBy Andy Robinson, Extension Potato Agronomist, NDSU/UMN and Darrin Haagenson, USDA Plant Physiologist airflowof1.5cfm/cwt.Apressure chamber.Becauseoftheharvestplatewasusedtoprovidepressure datedifferences,theyellowpotatobyincrementallyincreasingthe data shown is only mean data andpressureuntilitreached2.1 was not analyzed statistically. lb/inch2 tosimulatepilepressure.Subsampleswereplacedinthe After removing the tubers, they werechamber on October 10, 2019 and weighed,steampeeled,andtheremoved on March 2, 2020 for eval- number and size of pressure bruisesuation.were measured. Standard grown cul-tivars were used as checks to bench-Two trials were conducted, one for markothertubers.Differencesinredpotatoesandoneforyellow thedatawerefoundforthered-potatoes. For the red potato trial five skinned potatoes (Table 1) and theIn2019wetested17red-skinned tubers from each replicate (a total of meandatafortheyellow-skinnedand30yellow-skinnedcultivarsor 20tubersforeachselections in two different trials. The clone)wereplacedyield results for these trials can be in small mesh bagsfoundatz.umn.edu/Potato2019 or intoapressuresearchforNorthDakotaFresh bruisechamberMarketPotatoCultivar/Selection developedbyTrialResultsfor2019.Aspartof DarrinHaagensonthesetrials,subsamplesoftubers attheUSDA-ARSharvestedwereplacedintoapost- PotatoWorksite.harvestpressurebruisestoragetest Because of the chal-at the USDA-ARS Potato Worksite in lengeswithhar-East Grand Forks, Minnesota.vesting the yellow-skinned tubers overThe pressure bruise chambers were two dates (Octobersetup to simulate storage in a com- 9 and 25) a subsam-mercial potato bin. Following a peri- ple of 5 tubers onlyod for wound healing, the tempera- fromthefirstdateturewasslowlyreducedto42F wereplacedintowith 95% relative humidity and an thepressurebruise Image 1. Pressure flattening of red-skinned potatoes. 18 POTATO GROWER MAY/JUNE 2020'