Petiole nitrate concentration as an indicator of geranium nitrogen status
- 1 June 1983
- journal article
- research article
- Published by Taylor & Francis in Communications in Soil Science and Plant Analysis
- Vol. 14 (5) , 363-371
- https://doi.org/10.1080/00103628309367372
Abstract
Pelargonium hortorum ‘Sincerity’ plants were grown at various levels of nitrogen to determine the response of foliar nitrogen and petiole nitrate concentrations to changes in nitrogen supply. Total nitrogen in the upper leaf blades and petiole nitrate concentrations were both highly correlated with nitrogen supply. However, changes in the concentrations of petiole nitrate reflected changes in nitrogen supply over a wider range of concentrations. The minimum critical concentrations associated with a 10% reduction in yield (dry weight) were 2.9% and 5,000 ppm for foliar nitrogen and petiole nitrate nitrogen, respectively.Keywords
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