Weights (kg) of poplar trees were obtained from trees planted in one region that was rich and moist and a second region that was sandy and dry. The trees were given different treatments as identified in the table below. The data are from a study conducted by researchers at Pennsylvania State University and were provided by Minitab, Inc.; the Minitab results are displayed. What do you conclude?

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No Treatment 0.15 0.02 0.16 0.37 0.22 0.60 1.11 0.07 0.07 0.44 Fertilizer 1.34 0.14 0.02 0.08 0.08 1.16 0.93 0.30 0.59 0.17 Irrigation 0.23 0.04 0.34 0.16 0.05 0.65 0.08 0.62 0.01 0.03 Fertilizer and Irrigation 2.03 0.27 0.92 1.07 2.38 0.22 2.13 2.33 1.74 0.12 Site 1 (rich, moist) Site 2 (sandy, dry) MINITAB Source site Treatment Interaction 3 0.1716 0.05721 0.17 0.915 Error Tetal DE 1 0.2722 0.27223 0.81 0.374 3 7.5470 2.31567 7.90 0.001 2 10-7267 0.33521 39 18-7176