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The effects of competition with Agropyron repens and of nitrogen- and water-supply on the nitrogen content of Impatiens parviflora



The effects of competition with Agropyron repens and of nitrogen- and water-supply on the nitrogen content of Impatiens parviflora



Ann Botany London 26(103): 361-373



The nitrogen contents of plants of Impatiens parviflora grown in pots with and without root competition from Agropyron repens, and with two levels of nitrogen- and water-supply, were determined. The nitrogen percentage and the nitrogen content were depressed by competition and increased by nitrogen application. Watering increased nitrogen content and percentage in plants growing with competition; the increased growth associated with such watering was approximately equivalent to the nitrogen increase. These effects were chiefly due to responses in the nitrogen absorption rate per unit root dry-weight. Root dry-weight/total dry-weight ratio changes were generally in the opposite direction, but were relatively small. When Net Assimilation Rate was calculated on a leaf nitrogen basis, the effect of competition was relatively less than when it was calculated on a leaf area basis, but the depression caused by high nitrogen status was much larger. When Net Assimilation Rate calculated on a leaf area basis was compared with nitrogen per unit leaf area there was evidence of a single relationship for all treatments. It appeared that most of the variation in Net Assimilation Rate between treatments was caused by differences in nitrogen status.

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