Abstract
Nitrogen uptake and N and C partitioning were evaluated in `Sharpblue' southern highbush blueberries fertilized with different N forms. Plants were grown in acid-washed silica sand and fertilized with a modified Hoagland's solution supplemented with 5.0 m m N as NH 4 + or NO 3 - . Nutrient solution pH was adjusted to 3.0 and 6.5 for the NO 3 - and NH 4 + -treated plants, respectively. After 12 months of growth, plants were dual labeled with 14 CO 2 and 10% enriched 15 N-N as either NaNO 3 or (NH 4 ) 2 SO 4 and harvested 12 hours after labeling. Fertilization with NO 3 - -N increased leaf, stem, and root dry weights compared to NH 4 + fertilization. Total 15 N uptake did not differ between N fertilization treatments, thus whole plant and root 15 N concentrations were greater in NH 4 + -fertilized vs. NO 3 - -fertilized plants. Fertilization with NO 3 - -N increased C partitioning to new shoots compared to NH 4 + -fertilized plants. However, C partitioning to other plant parts was not affected by N form. Although NO 3 - uptake in blueberry appears to be restricted relative to NH 4 + uptake, this limitation does not inhibit vegetative growth. Additionally, there appears to be adequate available carbohydrate to support concurrent vegetative growth and N assimilation, regardless of N form.
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Claims 7
Claim · model-written summary
Nitrate fertilization increased blueberry leaf, stem, and root dry weights versus ammonium fertilization.
Verbatim
e0“Fertilization with NO 3 - -N increased leaf, stem, and root dry weights compared to NH 4 + fertilization.”
t0“Blueberry”
Claim · model-written summary
Total 15 N uptake did not differ between nitrogen treatments.
- Taxon
- Blueberryt0
- Treatment
- N fertilization treatmentse0
- Outcome
- Total 15 N uptakee0
- Direction
- did not differe0
Not reportedComparator
Verbatim
e0“Total 15 N uptake did not differ between N fertilization treatments”
t0“Blueberry”
Claim · model-written summary
Whole-plant and root 15 N concentrations were greater with ammonium than nitrate fertilization.
Verbatim
e0“whole plant and root 15 N concentrations were greater in NH 4 + -fertilized vs. NO 3 - -fertilized plants”
t0“Blueberry”
Claim · model-written summary
Nitrate fertilization increased carbon partitioning to new shoots compared with ammonium fertilization.
Verbatim
e0“Fertilization with NO 3 - -N increased C partitioning to new shoots compared to NH 4 + -fertilized plants.”
t0“Blueberry”
Claim · model-written summary
Nitrogen form did not affect carbon partitioning to other plant parts.
- Taxon
- Blueberryt0
- Treatment
- N forme0
- Outcome
- C partitioning to other plant partse0
- Direction
- not affectede0
Not reportedComparator
Verbatim
e0“C partitioning to other plant parts was not affected by N form.”
t0“Blueberry”
Claim · model-written summary
Restricted nitrate uptake relative to ammonium uptake did not inhibit blueberry vegetative growth.
Verbatim
e0“NO 3 - uptake in blueberry appears to be restricted relative to NH 4 + uptake, this limitation does not inhibit vegetative growth.”
Claim · model-written summary
Available carbohydrate appeared adequate for concurrent vegetative growth and nitrogen assimilation regardless of nitrogen form.
Verbatim
e0“there appears to be adequate available carbohydrate to support concurrent vegetative growth and N assimilation, regardless of N form.”
t0“Blueberry”
The same questions in other papers
fertilization · nutrient: content · VacciniumPositive and negative results
6 papers in the same direction as this paper · 10 in the opposite direction
- no effect
- positive
- positive
13 papers more in this group
See all 17 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.