Gary and Nancy Guthrie, Nevada, have a CSA garden where new questions are always cropping up. In 2001, they addressed questions of fertility, specifically foliar fertilization. Gary had read that potatoes responded to a fish emulsion-kelp mix and a proprietary calcium product if applied to the leaves of the young plants. He wanted to check the effects of calcium and fish-kelp, both separately and together, which led to a “2×2 factorial” experiment. But Gary was also interested to look at the response of the different potato varieties on the farm, so he repeated the trial for each of five varieties.
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