Abstract
Orchard experiments were carried out in Botswana with the objective of evaluating the effect of 2,4- dichlorophenoxyacetic acid (2,4-D) on reducing premature fruit drop. Different concentration levels of the 2,4-D (8, 16 and 20 mg/L were applied exogenously to mature fruit trees of sweet orange (Citrus sinensis L.) in the 2004/2005 season. In the 2005/2006 season the 2,4-D treatments ranged from 20 to 40 mg/L concentration. There appeared a general increase in fruit drop for the month of October in all treatments but a decrease in fruit drop was observed in the fruit trees with 16 and 20 mg/L 2,4-D concentration, that is, from November through February; with the latter showing the least number of fruits that dropped throughout the execution of the experiments. The application of 20 mg/L 2,4-D significantly reduced fruit drop by more than 50% but higher concentration levels of the plant growth regulator significantly increased fruit drop. It was also evident that, small sized fruits were more susceptible to fruit drop than larger fruits. These findings suggested that, 2,4-D can be an effective tool to control fruit drop by enhancing retention, as well as improving the quality of navel oranges under dry climatic conditions
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Claims 7
Claim · model-written summary
Fruit drop generally rose in October across treatments.
- Taxon
- navel oranges
Citrus sinensist0 - Outcome
- fruit drope0
- Direction
- increasee0
- Qualifier
- all treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There appeared a general increase in fruit drop for the month of October in all treatments”
t0“navel oranges (Citrus sinensis L.)”
Claim · model-written summary
Fruit drop decreased from November through February with 16 mg/L 2,4-D.
- Taxon
- navel orangesCitrus sinensist0
- Treatment
- 16 and 20 mg/L 2,4-D concentratione0
- Outcome
- fruit drope0
- Direction
- decreasee0
- Qualifier
- from November through Februarye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a decrease in fruit drop was observed in the fruit trees with 16 and 20 mg/L 2,4-D concentration, that is, from November through February”
t0“navel oranges (Citrus sinensis L.)”
Claim · model-written summary
The 20 mg/L 2,4-D treatment had the fewest dropped fruits through the experiment.
- Taxon
- navel orangesCitrus sinensist0
- Treatment
- 20 mg/L 2,4-De1
- Outcome
- number of fruits that droppede0
- Direction
- leaste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with the latter showing the least number of fruits that dropped throughout the execution of the experiments”
e1“a decrease in fruit drop was observed in the fruit trees with 16 and 20 mg/L 2,4-D concentration, that is, from November through February”
t0“navel oranges (Citrus sinensis L.)”
Claim · model-written summary
Applying 20 mg/L 2,4-D significantly reduced fruit drop by more than 50%.
- Taxon
- navel orangesCitrus sinensist0
- Treatment
- 20 mg/L 2,4-De0
- Outcome
- fruit drope0
- Direction
- reducede0
- Value
- more than 50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 20 mg/L 2,4-D significantly reduced fruit drop by more than 50%”
t0“navel oranges (Citrus sinensis L.)”
Claim · model-written summary
Higher 2,4-D concentrations significantly increased fruit drop.
- Taxon
- navel orangesCitrus sinensist0
- Treatment
- higher concentration levels of the plant growth regulatore0
- Outcome
- fruit drope0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher concentration levels of the plant growth regulator significantly increased fruit drop”
t0“navel oranges (Citrus sinensis L.)”
Claim · model-written summary
Smaller fruits were more susceptible to fruit drop than larger fruits.
- Taxon
- navel orangesCitrus sinensist0
- Organ / stage
- small sized fruitse0
- Outcome
- fruit drope0
- Direction
- more susceptiblee0
- Comparator
- larger fruitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“small sized fruits were more susceptible to fruit drop than larger fruits”
t0“navel oranges (Citrus sinensis L.)”
Claim · model-written summary
The authors suggest 2,4-D for fruit retention and quality under dry conditions.
- Taxon
- navel orangesCitrus sinensise0
- Treatment
- 2,4-De0
- Outcome
- control fruit drop by enhancing retention, as well as improving the qualitye0
- Qualifier
- under dry climatic conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“2,4-D can be an effective tool to control fruit drop by enhancing retention, as well as improving the quality of navel oranges under dry climatic conditions”
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See all 10 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.