Paper · 1952 · Botanical Gazette

Responses of Orange and Grapefruit Trees to Maleic Hydrazide

Louis C. Erickson; B. L. Brannaman; Henry Z. Hield; et al.

14
claims
18
verbatim quotes
6
citations
4
research areas
—
Not open access

Abstract

1. Maleic hydrazide (MH) spray delayed spring growth of Valencia orange and grapefruit trees when applied during late winter at concentrations of 1,000 p.p.m. or 500 p.p.m. but not at 100 p.p.m. 2. Fruit of Valencia orange trees sprayed in late winter showed a correlation between the concentration of MH in the spray and the total soluble solids in the juice. Other factors of fruit quality were not apparently altered. No effects were noted in the quality of fruit from sprayed grapefruit trees. Fruit of the succeeding crop of Valencia oranges had a smaller mean diameter. 3. Fruit of Washington Navel orange trees sprayed with MH at bloom or later showed a reduction in mean fruit size, but there was more fruit per tree on sprayed than on unsprayed trees. Severe modifications of fruit in the form of thickened peel and absence of juice vesicles were found in small fruit from trees sprayed at bloom. The quality of the fruit from trees sprayed at bloom was altered, and off-flavor was detected. When trees were sprayed several weeks after bloom, no effects on quality of fruit juice were noted.

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The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.

Claims 14

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Late winter MH spray at 1,000 or 500 p.p.m. delayed spring growth of Valencia orange trees.

Taxon
Valencia orangeCitrus sinensise0
Treatment
Maleic hydrazide (MH) spraye0
Outcome
spring growthe0
Direction
delayede0
Qualifier
during late winter at concentrations of 1,000 p.p.m. or 500 p.p.m.e0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus sinensis
Citrus sinensis · TaxonEllen Levy Finch ( Elf ) · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Maleic hydrazide (MH) spray delayed spring growth of Valencia orange and grapefruit trees when applied during late winter at concentrations of 1,000 p.p.m. or 500 p.p.m. but not at 100 p.p.m.”

✓ located verbatim in the source · abstract, characters 3–194 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Late winter MH spray at 1,000 or 500 p.p.m. delayed spring growth of grapefruit trees.

Taxon
grapefruit treesCitrus ×paradisie0
Treatment
Maleic hydrazide (MH) spraye0
Outcome
spring growthe0
Direction
delayede0
Qualifier
during late winter at concentrations of 1,000 p.p.m. or 500 p.p.m.e0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus x paradisi
Citrus ×paradisi · TaxonAmada44 · CC BY 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Maleic hydrazide (MH) spray delayed spring growth of Valencia orange and grapefruit trees when applied during late winter at concentrations of 1,000 p.p.m. or 500 p.p.m. but not at 100 p.p.m.”

✓ located verbatim in the source · abstract, characters 3–194 · show in text ↑
Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

MH spray at 100 p.p.m. did not delay spring growth of Valencia orange trees.

Taxon
Valencia orangeCitrus sinensise0
Treatment
100 p.p.m.e0
Outcome
spring growthe0
Direction
note0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus sinensis
Citrus sinensis · TaxonEllen Levy Finch ( Elf ) · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Maleic hydrazide (MH) spray delayed spring growth of Valencia orange and grapefruit trees when applied during late winter at concentrations of 1,000 p.p.m. or 500 p.p.m. but not at 100 p.p.m.”

✓ located verbatim in the source · abstract, characters 3–194 · show in text ↑
Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

MH spray at 100 p.p.m. did not delay spring growth of grapefruit trees.

Taxon
grapefruit treesCitrus ×paradisie0
Treatment
100 p.p.m.e0
Outcome
spring growthe0
Direction
note0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus x paradisi
Citrus ×paradisi · TaxonAmada44 · CC BY 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Maleic hydrazide (MH) spray delayed spring growth of Valencia orange and grapefruit trees when applied during late winter at concentrations of 1,000 p.p.m. or 500 p.p.m. but not at 100 p.p.m.”

✓ located verbatim in the source · abstract, characters 3–194 · show in text ↑
Associationobservedoriginal resultmeasured

Claim · model-written summary

MH concentration correlated with juice total soluble solids in Valencia orange fruit.

Taxon
Valencia orange treesCitrus sinensise0
Organ / stage
Fruite0
Treatment
concentration of MH in the spraye0
Outcome
total soluble solids in the juicee0

Not reportedDirection

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus sinensis
Citrus sinensis · TaxonEllen Levy Finch ( Elf ) · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Fruit of Valencia orange trees sprayed in late winter showed a correlation between the concentration of MH in the spray and the total soluble solids in the juice.”

✓ located verbatim in the source · abstract, characters 198–360 · show in text ↑
Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Other fruit quality factors were apparently unaltered in sprayed Valencia orange trees.

Taxon
Valencia orange treesCitrus sinensise0
Treatment
sprayed in late wintere0
Outcome
Other factors of fruit qualitye0
Direction
not apparently alterede0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus sinensis
Citrus sinensis · TaxonEllen Levy Finch ( Elf ) · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Fruit of Valencia orange trees sprayed in late winter showed a correlation between the concentration of MH in the spray and the total soluble solids in the juice. Other factors of fruit quality were not apparently altered.”

✓ located verbatim in the source · abstract, characters 198–420 · show in text ↑
Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Sprayed grapefruit trees showed no effects on fruit quality.

Taxon
grapefruit treesCitrus ×paradisie0
Treatment
sprayede0
Outcome
quality of fruite0
Direction
No effectse0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus x paradisi
Citrus ×paradisi · TaxonAmada44 · CC BY 3.0 · Wikimedia Commons ↗

Verbatim

e0

“No effects were noted in the quality of fruit from sprayed grapefruit trees.”

✓ located verbatim in the source · abstract, characters 421–497 · show in text ↑
Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Fruit of the succeeding Valencia orange crop had smaller mean diameter.

Taxon
Valencia orangesCitrus sinensise0
Organ / stage
Fruite0
Outcome
mean diametere0
Direction
smallere0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus sinensis
Citrus sinensis · TaxonEllen Levy Finch ( Elf ) · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Fruit of the succeeding crop of Valencia oranges had a smaller mean diameter.”

✓ located verbatim in the source · abstract, characters 498–575 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Washington Navel orange trees sprayed with MH at bloom or later produced smaller fruit.

Taxon
Washington Navel orange treesCitrus sinensise0
Treatment
sprayed with MH at bloom or latere0
Outcome
mean fruit sizee0
Direction
reductione0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus sinensis
Citrus sinensis · TaxonEllen Levy Finch ( Elf ) · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Fruit of Washington Navel orange trees sprayed with MH at bloom or later showed a reduction in mean fruit size”

✓ located verbatim in the source · abstract, characters 579–689 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Sprayed Washington Navel orange trees had more fruit per tree than unsprayed trees.

Taxon
Washington Navel orange treesCitrus sinensise0
Treatment
sprayed with MH at bloom or latere0
Outcome
fruit per treee0
Direction
moree0
Comparator
unsprayed treese0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus sinensis
Citrus sinensis · TaxonEllen Levy Finch ( Elf ) · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Fruit of Washington Navel orange trees sprayed with MH at bloom or later showed a reduction in mean fruit size, but there was more fruit per tree on sprayed than on unsprayed trees.”

✓ located verbatim in the source · abstract, characters 579–760 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Spray at bloom produced thickened peel in small Washington Navel orange fruit.

Taxon
Washington Navel orange treesCitrus sinensise0
Treatment
sprayed at bloome1
Outcome
thickened peele1

Not reportedComparatorDirection

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus sinensis
Citrus sinensis · TaxonEllen Levy Finch ( Elf ) · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Fruit of Washington Navel orange trees sprayed with MH at bloom or later”

✓ located verbatim in the source · abstract, characters 579–651 · show in text ↑
e1

“Severe modifications of fruit in the form of thickened peel and absence of juice vesicles were found in small fruit from trees sprayed at bloom.”

✓ located verbatim in the source · abstract, characters 761–905 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Spray at bloom produced absence of juice vesicles in small Washington Navel orange fruit.

Taxon
Washington Navel orange treesCitrus sinensise0
Treatment
sprayed at bloome1
Outcome
absence of juice vesiclese1

Not reportedComparatorDirection

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus sinensis
Citrus sinensis · TaxonEllen Levy Finch ( Elf ) · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Fruit of Washington Navel orange trees sprayed with MH at bloom or later”

✓ located verbatim in the source · abstract, characters 579–651 · show in text ↑
e1

“Severe modifications of fruit in the form of thickened peel and absence of juice vesicles were found in small fruit from trees sprayed at bloom.”

✓ located verbatim in the source · abstract, characters 761–905 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Fruit quality was altered and off-flavor detected after bloom spray in Washington Navel orange trees.

Taxon
Washington Navel orange treesCitrus sinensise0
Treatment
sprayed at bloome1
Outcome
quality of the fruite1
Direction
alterede1

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus sinensis
Citrus sinensis · TaxonEllen Levy Finch ( Elf ) · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Fruit of Washington Navel orange trees sprayed with MH at bloom or later”

✓ located verbatim in the source · abstract, characters 579–651 · show in text ↑
e1

“The quality of the fruit from trees sprayed at bloom was altered, and off-flavor was detected.”

✓ located verbatim in the source · abstract, characters 906–1000 · show in text ↑
Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Juice quality showed no effects when Washington Navel orange trees were sprayed several weeks after bloom.

Taxon
Washington Navel orange treesCitrus sinensise0
Treatment
sprayed several weeks after bloome1
Outcome
quality of fruit juicee1
Direction
no effectse1

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus sinensis
Citrus sinensis · TaxonEllen Levy Finch ( Elf ) · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Fruit of Washington Navel orange trees sprayed with MH at bloom or later”

✓ located verbatim in the source · abstract, characters 579–651 · show in text ↑
e1

“When trees were sprayed several weeks after bloom, no effects on quality of fruit juice were noted.”

✓ located verbatim in the source · abstract, characters 1001–1100 · show in text ↑

application · growth · Citrus x paradisi (grapefruit)Positive and negative results

5 papers: 2 positive, 3 negative or no effect

2 papers in the same direction as this paper · 2 in the opposite direction

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application · quality: general · Citrus sinensis (sweet orange)Positive and negative results

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1 paper in the same direction as this paper · 8 in the opposite direction

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application · quality: grain · Citrus sinensis (sweet orange)Positive and negative results

16 papers: 10 positive, 6 negative or no effect

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application · growth · Citrus sinensis (sweet orange)Positive and negative results

31 papers: 27 positive, 4 negative or no effect

3 papers in the same direction as this paper · 27 in the opposite direction

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application · yield · Citrus sinensis (sweet orange)Positive and negative results

77 papers: 65 positive, 12 negative or no effect

64 papers in the same direction as this paper · 12 in the opposite direction

  1. no effect
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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.