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Fig. 1. Annual mean yields of (a) total and (b) U.S. no. 1 potatoes in the amended and nonamended soil treatments in Phase 1 (n = 24) and Phase 2 (n = 8) of the Maine Potato Ecosystem Project. Error bars correspond to 1 SE. Significant differences between the treatments in any given year are indicated with * p < 0.05 and ** p < 0.01.

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