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Potato Yield Stability under Contrasting Soil Management Strategies

Dep. of Plant, Soil and Environmental Sciences, Univ. of Maine, Orono, ME 04469

View larger version (32K): [in this window] [in a new window]   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.

View larger version (25K): [in this window] [in a new window]   Fig. 2. Linear regression of (a) total potato yield and (b) U.S. no. 1 potato yield on the environment mean yield for amended (filled triangle) and nonamended (open triangle) soil management treatments of the Maine Potato Ecosystem Project, 1992 to 2004. Individual data points are the mean of four replicates (n = 4). Probability values are from extra sums of squares (ESS) analysis comparing amended vs. nonamended soil regression lines (n = 52; 13 yr times four replicates).

View larger version (26K): [in this window] [in a new window]   Fig. 3. Linear regression of (a) total potato yield and (b) U.S. no. 1 potato yield on June through August rainfall for amended (filled triangle) and nonamended (open triangle) soil management treatments of the Maine Potato Ecosystem Project, 1992 to 2004. Individual data points are the mean of four replicates (n = 4). Probability values are from extra sums of squares (ESS) analysis comparing amended vs. nonamended soil regression lines (n = 52; 13 yr times four replicates).

View larger version (13K): [in this window] [in a new window]   Fig. 4. Gravimetric soil moisture in the amended and nonamended soil treatments (a) in the first year soil moisture was measured (1995), (b) at the end of Phase 1 (1998), and (c) 6 yr into Phase 2 (2004) of the Maine Potato Ecosystem Project (n = 8). Error bars correspond to 1 SE. Significant differences between the treatments in any given year are indicated with * p < 0.05, ** p < 0.01, and *** p < 0.001.