What question did this study set out to answer?

To evaluate the capacity of mature pear trees to utilize internal reserve nitrogen versus newly applied fertilizer for seasonal growth and fruit production.

January 1, 1991Journal of Horticultural Science

Recycling of nitrogen in field-grown ‘Cornice’ pears

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Authors

ESEnrique Eduardo SánchezOregon State University TRTimothy L. RighettiUniversity of Guam DŠD. ŠugarAgricultural Research Service

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Implication

Field experiment reveals substantial internal nitrogen recycling for new growth in pear trees, indicating that fertilizer requirements are lower than previously estimated.

Key Points

To evaluate the capacity of mature pear trees to utilize internal reserve nitrogen versus newly applied fertilizer for seasonal growth and fruit production.
Applied ammonium nitrate depleted in 15N to five-year-old 'Comice' pear trees grown in sandy loam soil to trace nitrogen dynamics.
Excavated eight dormant trees annually over three years to evaluate biomass partitioning, total nitrogen, and fertilizer-derived nitrogen across tree components.
Quantified seasonal nitrogen losses resulting from harvested fruits, leaf litter, and routine pruning.
Reserve nitrogen supplied 48% of the total nitrogen in new growth, with branches, trunk, and roots acting as the primary exporting tissues.
Leaves, fruits, and one-year-old wood utilized 28% and 34% of the total nitrogen reserve pool in 1988 and 1989, respectively, with approximately 45% of reserve nitrogen partitioned to new growth in 1989.
A heavy crop load in 1989 shifted reserve nitrogen partitioning toward fruit development at the expense of other tree components.

Cite This Study

Sánchez et al. (1991) studied this question.

synapsesocial.com/papers/6a9dec552cea25e31b90d0b1 https://doi.org/10.1080/00221589.1991.11516177

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Implication

Field experiment reveals substantial internal nitrogen recycling for new growth in pear trees, indicating that fertilizer requirements are lower than previously estimated.

Recycling of nitrogen in field-grown ‘Cornice’ pears

Discussion

Member takes

Implication

Key Points

Cite This Study

Recycling of nitrogen in field-grown ‘Cornice’ pears

Discussion

Member takes

Implication

Key Points

Cite This Study

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