Boron isotope variability related to boron speciation (change during uptake and transport) in bell pepper plants and SI traceable n(11 B)/n(10 B) ratios for plant reference materials.

The B isotopes can be used to identify plant metabolism in response to the B concentration in the irrigation water and during intra-plant B transfer. The large B isotope fractionation within the plants demonstrates the importance of biological B cycling for the global B cycle.