Evaluation location: Wisconsin, United States
86 populations of microdontum were tested as tubers made in the winter of 2007-2008. 12 plants were tuberized for each pop and watered with 500 ppm calcium solution. After harvest, tubers were then sliced, dried, ground, ashed, and analyzed for calcium content (ppm of dry weight) by atomic spectrophotometry absorption. The average ranks were ranked, resulting in 53 unique average rank levels (several populations had equal average ranks, so only 53 rank levels, not 86). (Testing year average = 1113 max = 2053 min = 477)