Abstract
Cuttings of hybrid poplar (P.×euramericana) clone DN 17, grown in potted soil at 4 levels of P and 2 levels of Zn and/or Cu in the greenhouse, were examined for suspected P-induced micronutrient disorders. Phosphorus inhibited plant growth and caused pronounced leaf symptoms typical of nutrient disorders. Soil applications of Zn and Cu alone had no growth effect, although uptake of respective micronutrients in shoots was increased. At low phosphorus rates, Zn additions stimulated plant growth and prevented leaf symptom development; Cu supplementation, however, was not as effective as Zn. At high P rates, Zn and/or Cu restored plant growth to the control level, without completely preventing leaf symptom development, probably reflecting insufficient dosage rate to counter excessive P supply. Interpretations from foliar vector analysis indicated a primary Zn deficiency at low P treatments, and both Zn and Cu deficiencies at high P dosages. The results confirmed previous foliar diagnosis based on P-treated trees only, that excessive P fertilization may induce Zn and Cu deficiency in nursery grown hybrid poplar.
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Timmer, V.R., Teng, Y. Phosphorus-induced micronutrient disorders in hybrid poplar. Plant Soil 126, 31–39 (1990). https://doi.org/10.1007/BF00041366
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DOI: https://doi.org/10.1007/BF00041366