Claim · model-written summary
Within the optimal N range, root growth was moderated to a medium-low level.
CitrusNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“citrus”
e1“root growth was moderated to a medium-low level”
Title
Effects of summer nitrogen application rate on citrus shoot-root-soil interactions
Wenfeng Li; Qianzi Wang; Yongzhong Liu; et al. Scientia Horticulturae 2026. doi:10.1016/j.scienta.2026.114698
Other claims from this paper (17)
- Intervention effect Reducing nitrogen supply progressively delayed summer flush emergence in citrus.
- Intervention effect Reducing nitrogen supply advanced maturation of the summer flush, shortening the flush period.
- Intervention effect Moderate N (3–4 g per plant) significantly suppressed summer flush growth relative to high N (5–7 g per plant), reducing shoot number by 42.86 %.
- Intervention effect Moderate N (3–4 g per plant) significantly suppressed summer flush growth relative to high N (5–7 g per plant), reducing length by 8.99 %.
- Intervention effect Moderate N (3–4 g per plant) significantly suppressed summer flush growth relative to high N (5–7 g per plant), reducing basal diameter by 9.76 %.
- Intervention effect Moderate N (3–4 g per plant) significantly suppressed summer flush growth relative to high N (5–7 g per plant), reducing leaf number by 16.74 %.
- Intervention effect Moderate N (3–4 g per plant) significantly suppressed summer flush growth relative to high N (5–7 g per plant), reducing emergence rate by 29.37 %.
- Intervention effect Moderate N (3–4 g per plant) significantly suppressed summer flush growth relative to high N (5–7 g per plant), reducing biomass by 47.59 %.
- Intervention effect The optimal N range maximized the net increment in plant height (1.96 cm).
- Intervention effect The optimal N range maximized the net increment in main stem diameter (1.52 cm).
- Observation Within the optimal N range, summer shoots maintained medium-to-high levels of nutrient content (N, phosphorus, potassium).
- Observation Within the optimal N range, summer shoots maintained medium-to-high levels of physiologically active substances (abscisic acid, chlorophyll, proline).
- Observation The nutrient status of the root zone soil and roots remained in the medium-to-high range.
- Association Root zone soil ammonium and nitrate nitrogen concentrations and root length density were strongly correlated with summer flush architectural traits.
- Method / resource Multiple regression models incorporating soil nitrogen and root variables explained more than 50% of the variance in summer flush phenotype.
- Mechanism The regulation of summer flush growth is attributed to an N-driven soil-root-shoot feedback in which the root zone inorganic N pool, root morphology and the balance of shoot active substances jointly define growth patterns.
- Recommendation Applying 3–4 g N per plant is advisable as the ideal summer rate for potted citrus seedlings in controlled environments.