Abstract
‘Draper’ northern highbush blueberry (Vaccinium corymbosum L.) is a widely-planted mid-season cultivar with excellent fruit quality. Under the climatic conditions of Southwestern British Columbia, Canada, and Northwestern Washington, USA, it expresses a physiological disorder causing spontaneous green fruit drop (GFD) of up to half of the developing crop just prior to onset of the fruit coloring phenophase. Reduction of economic losses due to GFD required identification of the cause of this disorder and development of an agronomic solution that would reduce fruit drop. In 2014, two initial experiments were conducted to compare three foliar Ca products under a range of N fertilization rates. In 2015 and 2016, three locations were used in a first step to optimizing rates and timings of foliar Ca application. Initial experiments determined that higher N fertilization rates exacerbate GFD but that foliar Ca corrects the condition. Multi-site, multi-year trials identified key rates and timings for foliar Ca application to provide an agronomic solution for commercial growers. These trials identified an acute fruit Ca deficiency as the cause of GFD, and that foliar calcium applied frequently at high concentration from mid-bloom onward can be effective in reducing GFD, often to negligible levels. This condition has now been reported in several production regions around the world.
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Claims 5
Claim · model-written summary
Higher nitrogen fertilization rates exacerbate green fruit drop in ‘Draper’ blueberry.
- Taxon
- Vaccinium corymbosum L.
Vaccinium corymbosumt0 - Material
- ‘Draper’t0
- Treatment
- higher N fertilization ratese0
- Outcome
- GFDe0
- Direction
- exacerbatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Initial experiments determined that higher N fertilization rates exacerbate GFD but that foliar Ca corrects the condition.”
t0“‘Draper’ Highbush Blueberry (Vaccinium corymbosum L.)”
Claim · model-written summary
Foliar calcium corrects the green fruit drop condition in ‘Draper’ blueberry.
- Taxon
- Vaccinium corymbosum L.Vaccinium corymbosumt0
- Material
- ‘Draper’t0
- Treatment
- foliar Cae0
- Outcome
- GFDe0
- Direction
- correctse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Initial experiments determined that higher N fertilization rates exacerbate GFD but that foliar Ca corrects the condition.”
t0“‘Draper’ Highbush Blueberry (Vaccinium corymbosum L.)”
Claim · model-written summary
An acute fruit calcium deficiency was identified as the cause of green fruit drop.
- Taxon
- Vaccinium corymbosum L.Vaccinium corymbosumt0
- Compound
- Cae0
- Outcome
- GFDe0
- Qualifier
- an acute fruit Ca deficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These trials identified an acute fruit Ca deficiency as the cause of GFD”
t0“‘Draper’ Highbush Blueberry (Vaccinium corymbosum L.)”
Claim · model-written summary
Frequent high-concentration foliar calcium from mid-bloom onward can reduce green fruit drop, often to negligible levels.
- Taxon
- Vaccinium corymbosum L.Vaccinium corymbosumt0
- Treatment
- foliar calcium applied frequently at high concentration from mid-bloom onwarde0
- Outcome
- GFDe0
- Direction
- reducinge0
- Qualifier
- often to negligible levelse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar calcium applied frequently at high concentration from mid-bloom onward can be effective in reducing GFD, often to negligible levels.”
t0“‘Draper’ Highbush Blueberry (Vaccinium corymbosum L.)”
Claim · model-written summary
Green fruit drop has been reported in several production regions worldwide.
- Taxon
- Vaccinium corymbosum L.Vaccinium corymbosumt0
- Outcome
- Green Fruit Dropt0
- Setting
- several production regions around the worlde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This condition has now been reported in several production regions around the world.”
t0“Green Fruit Drop in ‘Draper’ Highbush Blueberry (Vaccinium corymbosum L.)”
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