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Changes in root cell ultrastructure of Vallisneria natans under different nutrient loading treatments. Increasing levels of N-P (in mg·L-1): NP-1, 0.5, 0.05; NP-2, 1.0, 0.1; NP-3, 5.0, 0.5; and NP-4, 10.0, 1.0.
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