October 9, 2025

Nitrogen, Phosphorus, and Carbohydrate In Expanding and Year-Old Douglas-Fir Shoots

Key Points

Year-old Douglas-fir shoots contribute significantly to new growth in spring, boosting vigor.
Nitrogen, phosphorus, and carbohydrate levels were monitored before and after bud break across different shoot ages.
Observational analysis focused on nutrient movement from older shoots to expanding foliage in Douglas-fir seedlings.
These findings highlight the importance of nutrient reserves in supporting the growth of newly outplanted seedlings.

Abstract

Abstract Nitrogen, phosphorus, and carbohydrate contents in expanding and 1-year-old shoots of Pseudotsuga menziesii (Mirb.) Franco seedlings were compared at intervals preceding and following bud break. Year-old shoots appear to supply substantial amounts of these materials to new growth in the spring. Such movement would appear to illustrate the potential value of reserve accumulation to support vigorous new shoot growth on newly outplanted seedlings.

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Cite This Study

Kenneth W. Krueger (Fri,) studied this question.

synapsesocial.com/papers/68e7103b90569dd607ee6bd4 https://doi.org/https://doi.org/10.1093/forestscience/13.4.352

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