Abstract
Calcium (Ca) has been considered a key element in maintaining fruit quality and extending the storage period of several fruits. The main blueberry (interspecific hybrids of Vaccinium corymbosum x V. darrowii) market for the Southern Hemisphere production involves a long transport between harvest and consumption. Foliar Ca sprays during the pre-harvest constitutes a common practice for improving Ca concentration [Ca] in fruits and therefore in alleviating the loss of firmness, dehydration and rot decay during postharvest. In this study, two formulations of Ca; Ca-nitrate [Ca(NO3)2] and chelate Ca-oxide (Ca-gluconate; Ca-Glu) were sprayed four times during pre-harvest of blueberry cv. O’Neal. [Ca] in the fruits was followed after each application and fruit quality parameters were determined at harvest and during 28 days of cold storage. Both formulations were ineffective in increasing [Ca] in the berries (or leaves) after any of the four applications. In fruits, [Ca] decreased from 0.32% at 25 days after full bloom (DAFB) to 0.11% Ca at harvest time. Other minerals such as magnesium (Mg), potassium (K), or nitrogen (N) remained unaffected by the treatments. Data shows that foliar pre-harvest applications of Ca, regardless of formula, were ineffective at increasing [Ca] or improving the quality of the fruit.
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Claims 5
Claim · model-written summary
Ca-nitrate [Ca(NO3)2] did not increase blueberry berry or leaf calcium concentration after four applications.
- Taxon
- blueberryt0
- Material
- ‘O’Neal’t0
- Treatment
- Ca-nitrate [Ca(NO3)2]e0
- Outcome
- [Ca] in the berries (or leaves)e1
- Direction
- ineffective in increasinge1
Not reportedComparator
Verbatim
t0“‘O’Neal’ blueberry”
e0“two formulations of Ca; Ca-nitrate [Ca(NO3)2] and chelate Ca-oxide (Ca-gluconate; Ca-Glu) were sprayed four times during pre-harvest”
e1“Both formulations were ineffective in increasing [Ca] in the berries (or leaves) after any of the four applications”
Claim · model-written summary
chelate Ca-oxide (Ca-gluconate; Ca-Glu) did not increase blueberry berry or leaf calcium concentration after four applications.
- Taxon
- blueberryt0
- Material
- ‘O’Neal’t0
- Treatment
- chelate Ca-oxide (Ca-gluconate; Ca-Glu)e0
- Outcome
- [Ca] in the berries (or leaves)e1
- Direction
- ineffective in increasinge1
Not reportedComparator
Verbatim
t0“‘O’Neal’ blueberry”
e0“two formulations of Ca; Ca-nitrate [Ca(NO3)2] and chelate Ca-oxide (Ca-gluconate; Ca-Glu) were sprayed four times during pre-harvest”
e1“Both formulations were ineffective in increasing [Ca] in the berries (or leaves) after any of the four applications”
Claim · model-written summary
Fruit calcium concentration fell from 0.32% at 25 DAFB to 0.11% at harvest.
Verbatim
t0“‘O’Neal’ blueberry”
e0“In fruits, [Ca] decreased from 0.32% at 25 days after full bloom (DAFB) to 0.11% Ca at harvest time”
Claim · model-written summary
Magnesium, potassium and nitrogen were unaffected by foliar calcium treatments.
- Taxon
- blueberryt0
- Treatment
- Cae1
- Outcome
- magnesium (Mg), potassium (K), or nitrogen (N)e0
- Direction
- remained unaffectede0
Not reportedComparator
Verbatim
t0“‘O’Neal’ blueberry”
e0“Other minerals such as magnesium (Mg), potassium (K), or nitrogen (N) remained unaffected by the treatments”
e1“two formulations of Ca; Ca-nitrate [Ca(NO3)2] and chelate Ca-oxide (Ca-gluconate; Ca-Glu)”
Claim · model-written summary
Preharvest foliar calcium did not improve blueberry fruit quality.
- Taxon
- blueberryt0
- Treatment
- foliar pre-harvest applications of Cae0
- Outcome
- quality of the fruite0
- Direction
- ineffectivee0
Not reportedComparator
Verbatim
t0“‘O’Neal’ blueberry”
e0“foliar pre-harvest applications of Ca, regardless of formula, were ineffective at increasing [Ca] or improving the quality of the fruit”
The same questions in other papers
calcium atom · nutrient: content · VacciniumResults differ
2 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- positive
- positive
1 paper more in this group
See all 5 papers →application · quality: general · VacciniumPositive and negative results
1 in the opposite direction
- 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.