Abstract
Aluminum (Al) toxicity constrains plant performance in acidic volcanic soils, yet nitrogen (N) fertilization may influence Al availability and plant responses. This study evaluated the effects of N source and rate under contrasting soil liming conditions on vegetative growth, mineral nutrition, and physiological performance of non-bearing northern highbush blueberry (Vaccinium corymbosum L. cv. Blue Ribbon®) plants. A split–split-plot experiment was conducted in southern Chile using urea or potassium nitrate applied at 0, 20, or 40 kg N ha−1 to plants grown in unlimed soil or soil amended with calcium carbonate or magnesium oxide. Vegetative growth, tissue mineral composition, stomatal conductance, chlorophyll fluorescence, and leaf chlorophyll were monitored during the first season. Growth responded primarily to soil liming rather than N supply, indicating low N demand and substantial soil N mineralization under the experimental conditions. Foliar N increased from 1.36 to 1.70% with increasing N rates. Urea nutrition reduced foliar Al concentration by 12% compared with nitrate. Under unlimed conditions, representing maximal soil Al availability, urea fertilization was associated with 70% higher Al retention in roots relative to nitrate. Chlorophyll content was consistently higher under urea supply, while the maximum photochemical efficiency of photosystem II remained unaffected. These findings indicate that N form influences plant Al partitioning independently of growth responses. Although the underlying mechanisms were not directly assessed, the observed patterns suggest that urea fertilization may reduce Al translocation to shoots under conditions of high Al availability.
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Claims 8
Claim · model-written summary
Growth of blueberry responded primarily to soil liming rather than to N supply.
- Taxon
- northern highbush blueberry
Vaccinium corymbosume0 - Treatment
- soil liminge1
- Outcome
- Growthe1
- Comparator
- N supplye1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-bearing northern highbush blueberry”
e1“Growth responded primarily to soil liming rather than N supply, indicating low N demand and substantial soil N mineralization under the experimental conditions”
Claim · model-written summary
Foliar N increased from 1.36 to 1.70% with increasing N rates.
- Taxon
- northern highbush blueberryVaccinium corymbosume0
- Treatment
- increasing N ratese2
- Outcome
- Foliar Ne2
- Direction
- increasede2
- Value
- 1.36 to 1.70%e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-bearing northern highbush blueberry”
e2“Foliar N increased from 1.36 to 1.70% with increasing N rates”
Claim · model-written summary
Urea reduced foliar Al concentration by 12% compared with nitrate.
- Taxon
- northern highbush blueberryVaccinium corymbosume0
- Treatment
- Urea nutritione3
- Outcome
- foliar Al concentratione3
- Direction
- reducede3
- Value
- 12%e3
- Comparator
- nitratee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-bearing northern highbush blueberry”
e3“Urea nutrition reduced foliar Al concentration by 12% compared with nitrate”
Claim · model-written summary
Under unlimed conditions, urea fertilization was associated with 70% higher Al retention in roots than nitrate.
- Taxon
- northern highbush blueberryVaccinium corymbosume0
- Treatment
- urea fertilizatione4
- Outcome
- Al retention in rootse4
- Direction
- highere4
- Value
- 70%e4
- Qualifier
- unlimed conditionse4
- Comparator
- nitratee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-bearing northern highbush blueberry”
e4“Under unlimed conditions, representing maximal soil Al availability, urea fertilization was associated with 70% higher Al retention in roots relative to nitrate”
Claim · model-written summary
Chlorophyll content was consistently higher under urea supply.
- Taxon
- northern highbush blueberryVaccinium corymbosume0
- Treatment
- urea supplye5
- Outcome
- Chlorophyll contente5
- Direction
- highere5
- Qualifier
- consistentlye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-bearing northern highbush blueberry”
e5“Chlorophyll content was consistently higher under urea supply, while the maximum photochemical efficiency of photosystem II remained unaffected”
Claim · model-written summary
The maximum photochemical efficiency of photosystem II was unaffected by urea supply.
- Taxon
- northern highbush blueberryVaccinium corymbosume0
- Treatment
- urea supplye5
- Outcome
- maximum photochemical efficiency of photosystem IIe5
- Direction
- remained unaffectede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-bearing northern highbush blueberry”
e5“Chlorophyll content was consistently higher under urea supply, while the maximum photochemical efficiency of photosystem II remained unaffected”
Claim · model-written summary
N form influences plant Al partitioning independently of growth responses.
- Taxon
- northern highbush blueberryVaccinium corymbosume0
- Treatment
- N forme6
- Outcome
- plant Al partitioninge6
- Qualifier
- independently of growth responsese6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-bearing northern highbush blueberry”
e6“These findings indicate that N form influences plant Al partitioning independently of growth responses”
Claim · model-written summary
Urea fertilization may reduce Al translocation to shoots under high Al availability.
- Taxon
- northern highbush blueberryVaccinium corymbosume0
- Treatment
- urea fertilizatione7
- Outcome
- Al translocation to shootse7
- Direction
- reducee7
- Qualifier
- conditions of high Al availabilitye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-bearing northern highbush blueberry”
e7“the observed patterns suggest that urea fertilization may reduce Al translocation to shoots under conditions of high Al availability”
The same questions in other papers
nitrogen · molecular: metabolites · Vaccinium corymbosum (highbush blueberry)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- positive
1 paper more in this group
See all 5 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.