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Fig. 1. Meteorological conditions during 2000 (closed circles) and 2001 (open circles) snap bean experiments. Daily photosynthetically active radiation (PAR), mean daily temperature, and mean daylight vapor pressure are compared on the basis of weeks after planting with a planting date of May 15 in 2000 and May 22 in 2001. Significant differences between years within a given weekly period are indicated at the 0.05 (*), 0.01 (**), and 0.001 (***) probability levels.
