As described for temperate Aldrovanda (Adamec, 1997) the cultivation water should be rather poor in N and P to control algal growth. In one aquarium, very low concentrations were measured (e.g., in microg/1: PO4-P, 10.2; NH4+-N, 0.0; NO3--N, 11.8; NO2--N, 6.5). You may add 1-2 small water snails (e.g. Planorbis) to a three-liter aquarium, but too many foul the water (Underwood, 1991).
In a previous paper (Adamec, 1997), I described how a disorder commonly exhibited by cultivated Aldrovanda was determined to be a boron deficiency. It has been confirmed recently that an addition of 0.05 ml/1 of complete microelement solution (see Table I) once or twice a year cures the plants. I have often observed this disorder in the Australian strains, but these plants are rather sensitive to boron-adding 0.5 mg/1 of H3BO3 can damage them. However, the addition of 0.03-0.05 ml/1 of the new, complete microelement solution will cure the plants of this disorder. Symptoms of iron deficiency (yellowish but healthy apices) are suppressed by an addition of 1-2 mg/1 of FeSO4.7H2O or 2-3 mg/1 of Fe-EDTA.
As described for temperate Aldrovanda (Adamec, 1997) the cultivation water should be rather poor in N and P to control algal growth. In one aquarium, very low concentrations were measured (e.g., in microg/1: PO4-P, 10.2; NH4+-N, 0.0; NO3--N, 11.8; NO2--N, 6.5). You may add 1-2 small water snails (e.g. Planorbis) to a three-liter aquarium, but too many foul the water (Underwood, 1991).
In a previous paper (Adamec, 1997), I described how a disorder commonly exhibited by cultivated Aldrovanda was determined to be a boron deficiency. It has been confirmed recently that an addition of 0.05 ml/1 of complete microelement solution (see Table I) once or twice a year cures the plants. I have often observed this disorder in the Australian strains, but these plants are rather sensitive to boron-adding 0.5 mg/1 of H3BO3 can damage them. However, the addition of 0.03-0.05 ml/1 of the new, complete microelement solution will cure the plants of this disorder. Symptoms of iron deficiency (yellowish but healthy apices) are suppressed by an addition of 1-2 mg/1 of FeSO4.7H2O or 2-3 mg/1 of Fe-EDTA.