Table 1.

The effect of EDU treatment on net photosynthesis of 2-yr-old containerized seedlings of yellow-poplar for a period of 7 days following treatment.

TimePhotosynthesisz (mgCO2m−2s−1)
EDU InjectionyEDU DrenchxNo EDU
  • zPhotosynthesis measured on a single leaf from each seedling (plastochron index=5). Each value represents the mean of 5 consecutive measurements on each of 12 seedlings. Mean separation among all treatment-time combinations by Duncan’s new multiple range test, 5% level.

  • y5 ml EDU (500 ppm) per seedling.

  • x250 ml EDU (500 ppm) per container.