Abstract
Twenty-three navel orange trees were grown in outdoor solution cultures for a period of 11 years to measure the effect of iron deficiency on fruit production and quality. When the concentration of iron in spring-cycle leaves was below 30 ppm (based on weight of dry leaves) in September, the production of fruit was less than when iron concentration exceeded 30 ppm. As the iron content decreased below this value, fruit production declined progressively and reached essentially zero at 15 ppm of iron. Fruit quality at harvest was not seriously affected except for some loss in color and the fact that iron content of the juice was about proportional to that in the leaves. The decrease in yield was due to fewer fruits being matured. Actual fruit sizes were the same or slightly larger in iron-deficient trees. Twig dieback was observed as a symptom of the degree of iron deficit that caused loss of fruit yield.
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Claims 7
Claim · model-written summary
Iron deficiency reduced navel orange fruit production compared with leaf iron above 30 ppm
- Taxon
- navel orange
Citrus sinensise0 - Treatment
- iron deficiencye0
- Outcome
- fruit productione0
- Direction
- lesse1
- Comparator
- iron concentration exceeded 30 ppme1
- Setting
- outdoor solution culturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“navel orange trees were grown in outdoor solution cultures for a period of 11 years to measure the effect of iron deficiency on fruit production”
e1“the production of fruit was less than when iron concentration exceeded 30 ppm”
Claim · model-written summary
Fruit production declined progressively as leaf iron fell below 30 ppm, reaching essentially zero at 15 ppm of iron
- Taxon
- navel orangeCitrus sinensise0
- Compound
- irone2
- Outcome
- fruit productione2
- Direction
- declinede2
- Value
- essentially zeroe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“navel orange trees were grown in outdoor solution cultures for a period of 11 years to measure the effect of iron deficiency on fruit production”
e2“As the iron content decreased below this value, fruit production declined progressively and reached essentially zero at 15 ppm of iron”
Claim · model-written summary
Fruit quality at harvest was not seriously affected, apart from some loss of color
- Taxon
- navel orangeCitrus sinensise0
- Outcome
- Fruit quality at harveste3
- Qualifier
- except for some loss in colore3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“navel orange trees were grown in outdoor solution cultures for a period of 11 years to measure the effect of iron deficiency on fruit production”
e3“Fruit quality at harvest was not seriously affected except for some loss in color”
Claim · model-written summary
Iron content of the juice was about proportional to iron content of the leaves
- Taxon
- navel orangeCitrus sinensise0
- Compound
- iron contente3
- Outcome
- iron content of the juicee3
- Direction
- proportionale3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“navel orange trees were grown in outdoor solution cultures for a period of 11 years to measure the effect of iron deficiency on fruit production”
e3“iron content of the juice was about proportional to that in the leaves”
Claim · model-written summary
The decrease in yield was attributed to fewer fruits being matured
- Taxon
- navel orangeCitrus sinensise0
- Outcome
- decrease in yielde4
- Qualifier
- fewer fruits being maturede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“navel orange trees were grown in outdoor solution cultures for a period of 11 years to measure the effect of iron deficiency on fruit production”
e4“The decrease in yield was due to fewer fruits being matured”
Claim · model-written summary
Fruit size was the same or slightly larger in iron-deficient trees
- Taxon
- navel orangeCitrus sinensise0
- Treatment
- iron-deficiente5
- Outcome
- fruit sizese5
- Direction
- the same or slightly largere5
- Setting
- outdoor solution culturese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“navel orange trees were grown in outdoor solution cultures for a period of 11 years to measure the effect of iron deficiency on fruit production”
e5“Actual fruit sizes were the same or slightly larger in iron-deficient trees”
Claim · model-written summary
Twig dieback was observed as a symptom of iron deficit that caused loss of fruit yield
- Taxon
- navel orangeCitrus sinensise0
- Outcome
- Twig diebacke6
- Qualifier
- symptom of the degree of iron deficite6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“navel orange trees were grown in outdoor solution cultures for a period of 11 years to measure the effect of iron deficiency on fruit production”
e6“Twig dieback was observed as a symptom of the degree of iron deficit that caused loss of fruit yield”
The same questions in other papers
iron atom · yield · Citrus sinensis (sweet orange)Positive and negative results
9 papers in the same direction as this paper · 2 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
- no effect
- positive
8 papers more in this group
See all 12 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.