Organic trials of commercially available potato varieties – 2011-2012

This information is drawn from organic on-farm trials in Wisconsin. Trials were run on 6 farms in 2011 and 7 farms in 2012. These farms were in different regions of Wisconsin, and differed for many factors including soil type, cropping history, and crop management. Some varieties deviated from the average performance shown below, on certain farms. We defined a significant statistical difference between varieties as meaning that we would expect to see this difference 19 times out of 20 (α = 0.05). So – your results may not be the same as those found here, but we hope that this will help you to choose a “short list” of varieties to try out on your farm. Happy trialing!

The first set of tables show total and marketable yield (in cwt/A = hundred- weight per acre. Hundred-weight = 100 pounds). Please refer to the “Significance Group (marketable yield)” column. The letters in the Significance Group column show which varieties performed significantly differently for marketable yield, ON AVERAGE. If varieties are followed by the same letter, they did not differ significantly on average. You can only compare marketable yields within the same group – the same market class, grown in the same year.

The second set of tables show the major causes for tubers to be culled, for each variety, in 2012. Use this as a guide to which varieties have significant problems with particular surface defects. The figures shown are the percentage of plots for which a given tuber defect was a major cause of culling. For most varieties, there were 13 plots total (across 7 farms).

Wisconsin Organic Potato Variety Trials 2011-2012 (pdf)