Fig. 4. Boron concentration in pepper leaves vs. B concentration in the soil solution adjusted for a water content of 30%, after 2 d of equilibration, and B concentration evaluated using Eq. [1], [2], and [3] and adsorption coefficients given in Table 2. The calculation was performed for the same pH, solution to soil ratio, and total B as in the plant growth experiment (the line is based on the evaluated values).