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We quantified and characterized fertility targets for nursery culture of container northern red oak (Quercus rubra L.) seedlings. Plants were supplied with a 15N-5P2O5-15K2O fertilizer at eight rates ranging from 0-150 mg N plant-1 and reared for 18 wk in a greenhouse. Plant growth and nutritional response to increased fertilization followed a curvilinear pattern depicting phases that ranged from deficiency to toxicity. Seedling dry mass production was maximized at sufficiency (25 mg N plant-1 season-1) while optimum N and P uptake occurred at 100 mg N plant-1 season-1. The 150 mg N plant-1 seasonal dose rate induced N and P toxicity, but resulted in antagonistic K interaction. Nutrient loading raised plant N and P contents by 27 and 55%. This new approach demonstrates promise to help refine fertility targets for nursery production of Q. rubra planting stock and may have application to other hardwood species or cultural systems. antagonistic interaction / exponential fertilization / growth / luxury uptake / northern red oak / vector diagnosis

Characterizing fertility targets and multi-element interactions in nursery culture ofQuercus rubraseedlings