Abstract
Abstract Climatic conditions in northern Idaho dictate that N fertilizer efficiency be maximized in commercial strawberry (Fragaria ananassa) fields. A field experiment was initiated at Sandpoint, Idaho in May of 1981 to determine the effect of 3 rates of ammonium nitrate, ammonium sulfate, and sulfur coated urea (SCU) on: (1) levels of available N in the surface 0–150, 150–300, and 300–450 mm soil zones, (2) plant soluble NO3‐N levels during full bloom, and (3) strawberry quality and yield. Greenhouse and laboratory studies were also initiated to determine the effect of N sources and rates on strawberry runner production and change in N availability over time at optimum soil moisture levels. Following fertilizer application, sulfur coated urea slowed the rate of N loss and increased available N in the surface 150 mm soil zone in the fall of 1981 and spring of 1982 when compared to ammonium sulfate or ammonium nitrate. Available soil N levels in the 150–300, 300–450 mm soil zones were largely unaffected by N source or N rate during the sampling period. Plant leaf‐soluble NO3‐N during full bloom was positively correlated (r2 = .63) with available N in the 0–150 mm soil zone. Strawberry yields in 1981 and 1982 were not influenced by N source or rate; however, individual strawberry weights were increased by 15% at the initial harvest with sulfur coated urea. The laboratory incubation study indicated that ammonium sulfate is readily soluble while SCU is slowly soluble in the soil solution. Under greenhouse conditions available soil N and runner production were correlated (r2 = 0.87).
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Sulfur coated urea slowed the rate of N loss in strawberry fields compared with ammonium sulfate or ammonium nitrate.
- Taxon
- Fragaria ananassa
_single2.jpg?width=60)
Fragaria ×ananassae0 - Treatment
- sulfur coated ureae2
- Outcome
- rate of N losse2
- Direction
- slowede2
- Comparator
- ammonium sulfate or ammonium nitratee2
- Setting
- Sandpoint, Idahoe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e0“commercial strawberry (Fragaria ananassa) fields”
e1“A field experiment was initiated at Sandpoint, Idaho in May of 1981”
e2“sulfur coated urea slowed the rate of N loss and increased available N in the surface 150 mm soil zone in the fall of 1981 and spring of 1982 when compared to ammonium sulfate or ammonium nitrate”
Claim · model-written summary
Sulfur coated urea increased available N in the surface 150 mm soil zone in fall 1981 and spring 1982 compared with ammonium sulfate or ammonium nitrate.
- Taxon
- Fragaria ananassaFragaria ×ananassae0
- Treatment
- sulfur coated ureae2
- Outcome
- available N in the surface 150 mm soil zonee2
- Direction
- increasede2
- Comparator
- ammonium sulfate or ammonium nitratee2
- Setting
- fall of 1981 and spring of 1982e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“commercial strawberry (Fragaria ananassa) fields”
e2“sulfur coated urea slowed the rate of N loss and increased available N in the surface 150 mm soil zone in the fall of 1981 and spring of 1982 when compared to ammonium sulfate or ammonium nitrate”
Claim · model-written summary
Available soil N in the 150-300 and 300-450 mm soil zones was largely unaffected by N source or N rate during sampling.
- Taxon
- Fragaria ananassaFragaria ×ananassae0
- Treatment
- N source or N ratee3
- Outcome
- Available soil N levelse3
- Direction
- unaffectede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“commercial strawberry (Fragaria ananassa) fields”
e3“Available soil N levels in the 150–300, 300–450 mm soil zones were largely unaffected by N source or N rate during the sampling period”
Claim · model-written summary
Leaf-soluble NO3-N of strawberry plants at full bloom was positively correlated with available N in the 0-150 mm soil zone (r2 = .63).
- Taxon
- Fragaria ananassaFragaria ×ananassae0
- Organ / stage
- leafe4
- Outcome
- leaf‐soluble NO3‐Ne4
- Direction
- positively correlatede4
- Value
- r2 = .63e4
- Comparator
- available Ne4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“commercial strawberry (Fragaria ananassa) fields”
e4“Plant leaf‐soluble NO3‐N during full bloom was positively correlated (r2 = .63) with available N in the 0–150 mm soil zone”
Claim · model-written summary
Strawberry yields in 1981 and 1982 were not influenced by N source or rate.
- Taxon
- Fragaria ananassaFragaria ×ananassae0
- Treatment
- N source or ratee5
- Outcome
- yieldse5
- Direction
- not influencede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“commercial strawberry (Fragaria ananassa) fields”
e5“Strawberry yields in 1981 and 1982 were not influenced by N source or rate”
Claim · model-written summary
Individual strawberry weights were increased by 15% at the initial harvest with sulfur coated urea.
- Taxon
- Fragaria ananassaFragaria ×ananassae0
- Treatment
- sulfur coated ureae6
- Outcome
- individual strawberry weightse6
- Direction
- increasede6
- Value
- 15%e6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“commercial strawberry (Fragaria ananassa) fields”
e6“individual strawberry weights were increased by 15% at the initial harvest with sulfur coated urea”
Claim · model-written summary
In the laboratory incubation study, ammonium sulfate was readily soluble in the soil solution.
- Taxon
- Fragaria ananassaFragaria ×ananassae0
- Compound
- ammonium sulfatee7
- Outcome
- readily solublee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“commercial strawberry (Fragaria ananassa) fields”
e7“The laboratory incubation study indicated that ammonium sulfate is readily soluble while SCU is slowly soluble in the soil solution”
Claim · model-written summary
In the laboratory incubation study, sulfur coated urea (SCU) was slowly soluble in the soil solution.
- Taxon
- Fragaria ananassaFragaria ×ananassae0
- Compound
- SCUe7
- Outcome
- slowly solublee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“commercial strawberry (Fragaria ananassa) fields”
e7“The laboratory incubation study indicated that ammonium sulfate is readily soluble while SCU is slowly soluble in the soil solution”
Claim · model-written summary
Under greenhouse conditions, available soil N and runner production were correlated (r2 = 0.87).
- Taxon
- Fragaria ananassaFragaria ×ananassae0
- Outcome
- runner productione1
- Value
- r2 = 0.87e1
- Comparator
- available soil Ne1
- Setting
- greenhouse conditionse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“commercial strawberry (Fragaria ananassa) fields”
e1“Under greenhouse conditions available soil N and runner production were correlated (r2 = 0.87)”
The same questions in other papers
nitrogen · organism · Fragaria x ananassa (strawberry)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
nitrogen · nutrient: content · Fragaria x ananassa (strawberry)Positive and negative results
2 papers in the same direction as this paper · 12 in the opposite direction
- positive
- positive
- positive
11 papers more in this group
See all 15 papers →nitrogen · soil: chemistry · Fragaria x ananassa (strawberry)Results agree
1 paper in the same direction as this paper
- positive
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.