Abstract
Rooted Potamogeton lucens L. plants were heavily damaged by NH 4 + concentrations of 40 ppm nitrogen, while detached branches were damaged by ammonium concentrations of 10–15 ppm nitrogen. Bubbling of CO 2 gas through the water reduced its pH from 8.5 to about 6.0 and this prevented the appearance of ammonium-induced injury symptoms. This effect was explained by the fact that the ionic form of ammonia is much slower to penetrate into cells than the molecular form. Dodecylbenzenesulfonate, when applied to the water in conjunction with an ammonium salt, produced rapid death of the plants. This was probably due to the much increased rate of ammonia uptake, caused by the effect of the detergent on the cell membranes.
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