Abstract
Abstract Highbush blueberries ( Vaccinium corymbosum L.) were fertilized with equal amounts of nitrogen from ammonium sulfate (AMS) or sulfur-coated urea (SCU) for 6 years. The plots treated with SCU yielded significantly more than the AMS plots three out of the five harvest years. Except for plant size in 1984, treatments did not significantly affect berry size, plant survival, and other vegetative characteristics. Soil pH after 5 years was significantly lower on the AMS treatments than on the SCU-treated plots (5.4 vs. 5.7). The nutrient content of the leaf tissue did not differ significantly by fertilizer source. At the rate used in this study, SCU would be an acceptable nitrogen source for blueberries compared to AMS, but SCU is less effective in maintaining low soil pH.
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Claims 9
Claim · model-written summary
SCU plots yielded significantly more than AMS plots in three of five harvest years.
- Taxon
- Highbush blueberries
Vaccinium corymbosumt0 - Treatment
- SCUe0
- Outcome
- yieldede0
- Direction
- moree0
- Value
- three out of the five harvest yearse0
- Comparator
- AMS plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plots treated with SCU yielded significantly more than the AMS plots three out of the five harvest years.”
t0“Highbush Blueberries”
Claim · model-written summary
Fertilizer treatment did not significantly affect berry size.
- Taxon
- Highbush blueberriesVaccinium corymbosumt0
- Treatment
- treatmentse0
- Outcome
- berry sizee0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except for plant size in 1984, treatments did not significantly affect berry size, plant survival, and other vegetative characteristics.”
t0“Highbush Blueberries”
Claim · model-written summary
Fertilizer treatment did not significantly affect plant survival.
- Taxon
- Highbush blueberriesVaccinium corymbosumt0
- Treatment
- treatmentse0
- Outcome
- plant survivale0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except for plant size in 1984, treatments did not significantly affect berry size, plant survival, and other vegetative characteristics.”
t0“Highbush Blueberries”
Claim · model-written summary
Fertilizer treatment did not significantly affect other vegetative traits.
- Taxon
- Highbush blueberriesVaccinium corymbosumt0
- Treatment
- treatmentse0
- Outcome
- other vegetative characteristicse0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except for plant size in 1984, treatments did not significantly affect berry size, plant survival, and other vegetative characteristics.”
t0“Highbush Blueberries”
Claim · model-written summary
Plant size was an exception to the otherwise nonsignificant treatment effects in 1984.
- Taxon
- Highbush blueberriesVaccinium corymbosumt0
- Treatment
- treatmentse0
- Outcome
- plant sizee0
- Qualifier
- 1984e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except for plant size in 1984, treatments did not significantly affect berry size, plant survival, and other vegetative characteristics.”
t0“Highbush Blueberries”
Claim · model-written summary
AMS treatment produced significantly lower soil pH than SCU after five years.
- Taxon
- Highbush blueberriesVaccinium corymbosumt0
- Treatment
- AMS treatmentse0
- Outcome
- Soil pHe0
- Direction
- lowere0
- Value
- 5.4e0
- Qualifier
- after 5 yearse0
- Comparator
- SCU-treated plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil pH after 5 years was significantly lower on the AMS treatments than on the SCU-treated plots (5.4 vs. 5.7).”
t0“Highbush Blueberries”
Claim · model-written summary
Leaf nutrient content did not significantly differ by fertilizer source.
- Taxon
- Highbush blueberriesVaccinium corymbosumt0
- Organ / stage
- leaf tissuee0
- Treatment
- fertilizer sourcee0
- Outcome
- nutrient contente0
- Direction
- did not differe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nutrient content of the leaf tissue did not differ significantly by fertilizer source.”
t0“Highbush Blueberries”
Claim · model-written summary
The authors consider SCU an acceptable blueberry nitrogen source at the study rate.
Verbatim
e0“At the rate used in this study, SCU would be an acceptable nitrogen source for blueberries compared to AMS”
Claim · model-written summary
SCU was less effective than AMS at maintaining low soil pH.
Verbatim
e0“but SCU is less effective in maintaining low soil pH.”
t0“Highbush Blueberries”
e1“SCU would be an acceptable nitrogen source for blueberries compared to AMS”
The same questions in other papers
fertilization · nutrient: content · Vaccinium corymbosum (highbush blueberry)Positive and negative results
4 papers in the same direction as this paper · 8 in the opposite direction
- negative
- positive
- positive
9 papers more in this group
See all 13 papers →nitrogen · yield · Vaccinium corymbosum (highbush blueberry)Positive and negative results
10 papers in the same direction as this paper · 3 in the opposite direction
- positive
- no effect
- no effect
10 papers more in this group
See all 14 papers →nitrogen · soil: chemistry · VacciniumResults agree
1 paper in the same direction as this paper
- negative
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.