Abstract
In order to investigate the boron tolerance of Phragmites australis reed plants in boron loaded water two series of pot experiments were carried out, the first du ring 1991-1993 with a soil substrate in the presence of free water and the second during 1992-1993 in a gravel hydroculture. In both cases, graduated additions of boron were made during the course of the vegetation period. In both years the number of stalks per pot, the height grown by the plants and the yield of dry substance of stalks and leaves, as well as the yield of roots at post-harvest time in some pots were determined. At harvest time the boron content in leaves stalks and roots was determined and correlated against the appearance of boron toxicity symptoms and reduction in yields. The results demonstrate that Phragmites australis can be classified as a particularly boron-tolerant plant, with insignificant leaf damage or reduction in yield when exposed to water containing up to 4 mg/l B.
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