Abstract
Consumer demand for locally grown, high quality strawberries is increasing even though California, Florida and Mexico provide a year-round source of strawberries for the world market. In most of the US, locally grown strawberries are only available for a short time in late spring from seasonal fruiting short-day cultivars thus off-season strawberry production is an attractive option for growers. Seed propagated hybrids such as ‘Elan’ are becoming more widely available and offer an alternative to often low yielding cultivars used for off-season production. To determine whether or not ‘Elan’ could be programmed to flower with photoperiod or nitrogen, seedlings were fertilized with either 100 or 800 ppm nitrogen for 4 weeks in September beginning one week after exposure to either short days, the natural photoperiod, or long days, the natural photoperiod supplemented with 24 hours of incandescent radiation. Plants were then greenhouse forced under both photoperiods and floral phenology evaluated. Elevated nitrogen during floral initiation in September enhanced and accelerated flowering and plants receiving elevated nitrogen during initiation under long days flowered more than any other treatment. To determine whether or not flowering could be enhanced a second time in the same plants, another 4 week period of elevated nitrogen was provided in December and plant phenology evaluated through mid-January. Elevated nitrogen (800 ppm) in December enhanced December and January flowering. Seedlings were conditioned with elevated nitrogen for a third time in late spring then field planted (early summer) on raised beds with white or black plastic mulch. Elevated nitrogen in late spring enhanced yield in field production. No effects of mulch color, initiation photoperiod or interaction of considered factors were detected. Flowering differences detected in greenhouse studies translated into differences observed in the production field suggesting programmed fruiting with elevated fertilization under field or greenhouse conditions would be feasible.
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Claims 10
Claim · model-written summary
Elevated nitrogen in September enhanced flowering.
- Taxon
- strawberry
_single2.jpg?width=60)
Fragaria ×ananassat0 - Material
- ‘Elan’t0
- Treatment
- Elevated nitrogen during floral initiation in Septembere0
- Outcome
- floweringe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e0“Elevated nitrogen during floral initiation in September enhanced and accelerated flowering and plants receiving elevated nitrogen during initiation under long days flowered more than any other treatment.”
t0“strawberry cultivar ‘Elan’”
Claim · model-written summary
Elevated nitrogen in September accelerated flowering.
- Taxon
- strawberryFragaria ×ananassat0
- Material
- ‘Elan’t0
- Treatment
- Elevated nitrogen during floral initiation in Septembere0
- Outcome
- floweringe0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated nitrogen during floral initiation in September enhanced and accelerated flowering and plants receiving elevated nitrogen during initiation under long days flowered more than any other treatment.”
t0“strawberry cultivar ‘Elan’”
Claim · model-written summary
Elevated nitrogen during initiation under long days produced the most flowering.
- Taxon
- strawberryFragaria ×ananassat0
- Material
- ‘Elan’t0
- Treatment
- elevated nitrogen during initiation under long dayse0
- Outcome
- flowerede0
- Direction
- moree0
- Comparator
- any other treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated nitrogen during floral initiation in September enhanced and accelerated flowering and plants receiving elevated nitrogen during initiation under long days flowered more than any other treatment.”
t0“strawberry cultivar ‘Elan’”
Claim · model-written summary
Elevated nitrogen in December enhanced December flowering.
- Taxon
- strawberryFragaria ×ananassat0
- Material
- ‘Elan’t0
- Treatment
- Elevated nitrogen (800 ppm) in Decembere0
- Outcome
- December and January floweringe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated nitrogen (800 ppm) in December enhanced December and January flowering.”
t0“strawberry cultivar ‘Elan’”
Claim · model-written summary
Elevated nitrogen in late spring enhanced field yield.
- Taxon
- strawberryFragaria ×ananassat0
- Material
- ‘Elan’t0
- Treatment
- Elevated nitrogen in late springe0
- Outcome
- yielde0
- Direction
- enhancede0
- Setting
- field productione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated nitrogen in late spring enhanced yield in field production.”
t0“strawberry cultivar ‘Elan’”
Claim · model-written summary
Mulch color had no detected effect.
- Taxon
- strawberryFragaria ×ananassat0
- Material
- ‘Elan’t0
- Treatment
- mulch colore0
- Outcome
- effectse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No effects of mulch color, initiation photoperiod or interaction of considered factors were detected.”
t0“strawberry cultivar ‘Elan’”
Claim · model-written summary
Initiation photoperiod had no detected effect.
- Taxon
- strawberryFragaria ×ananassat0
- Material
- ‘Elan’t0
- Treatment
- initiation photoperiode0
- Outcome
- effectse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No effects of mulch color, initiation photoperiod or interaction of considered factors were detected.”
t0“strawberry cultivar ‘Elan’”
Claim · model-written summary
No interaction among the considered factors was detected.
- Taxon
- strawberryFragaria ×ananassat0
- Material
- ‘Elan’t0
- Outcome
- interaction of considered factorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No effects of mulch color, initiation photoperiod or interaction of considered factors were detected.”
t0“strawberry cultivar ‘Elan’”
Claim · model-written summary
Greenhouse flowering differences translated into field differences.
- Taxon
- strawberryFragaria ×ananassat0
- Material
- ‘Elan’t0
- Outcome
- Flowering differencese0
- Setting
- production fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flowering differences detected in greenhouse studies translated into differences observed in the production field suggesting programmed fruiting with elevated fertilization under field or greenhouse conditions would be feasible.”
t0“strawberry cultivar ‘Elan’”
Claim · model-written summary
The authors concluded that elevated fertilization could feasibly program fruiting in field or greenhouse production.
- Taxon
- strawberryFragaria ×ananassat0
- Material
- ‘Elan’t0
- Outcome
- programmed fruiting with elevated fertilizatione0
- Setting
- field or greenhouse conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“programmed fruiting with elevated fertilization under field or greenhouse conditions would be feasible.”
t0“strawberry cultivar ‘Elan’”
The same questions in other papers
nitrogen · yield · Fragaria x ananassa (strawberry)Results differ
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- no effect
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See all 8 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.