Turions of Stratiotes aloides L. were grown at different ammonium levels under phosphorus deficient conditions in a staged gradient. After 13 weeks the plantlets appeared to be severely phosphorus deficient with the growth being seriously impaired. Nitrogen in the plants appeared to be predominantly present as soluble amino acids. This indicates that net protein synthesis was seriously disturbed. Asparagine was by far the dominant soluble amino acid in the plantlets. At the highest extemal ammonium levels, net growth was significantly retarded when compared with the other concentrations with free ammonium accumulating in the plants. Ammonium uptake under phosphorus deficient conditions strongly increases nutrient imbalances in the plants, and thus their vitality.
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