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High ammonia (i.e. the total of NH 3 and NH4+) concentration or nitrogen deficiency in water can exert stress on growth and health of many aquatic plants. To investigate the physiological impacts of high ammonia-N (NH 4 Cl) concentration and nitrogen deficiency on plant physiology, apical shoots of submerged macrophyte Egeria densa were first treated with five levels of nitrogen: 0,...
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