Adjacent images of seedlings in five float trays with boron concentrations of 0.5, 1, 2, 5, and 10 ppm, from left to right. Growth is greatly reduced at the highest concentration.

Figure 7. Tobacco seedling response to increasing concentrations of boron in float water solution at three weeks after seeding. Source water did not contain boron.

Adjacent images of seedlings in five float trays with boron concentrations of 0.5, 1, 2, 5, and 10 ppm, from left to right. Growth is greatly reduced at the highest concentration.

Photos by Norman Harrell, Wilson County Extension Director and Tobacco Agent.