Paper · 1970 · Journal of the Japanese Society for Horticultural Science

Some effects of foliar spray of zinc sulphate on growth, yield and fruit quality of guava (Psidium guajava L.)

J. S. ARORA; J. R. SINGH

8
claims
20
verbatim quotes
3
citations
3
research areas
✓
Open access

Abstract

Responses on various characters of guava trees due to foliar spray of zinc were studied in the field trial. The guava trees were sprayed with 0.0%, 0.2% and 0.4% zinc sulphate solutions during July 1966 and 1967. Significant improvement in growth characters, i.e., elongation of terminal shoot, number of leaves, leaf area per shoot and chlorophyll recovery was observed with zinc spray. The zinc spray also significantly reduced the time for fruit maturity and increased fruit yield significantly. The significant improvement was also recorded on Fruit weight, length, diameter, reducing sugars, Vitamin C, pectic substances and total soluble solids, And significant reduction in acidity.

Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗

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 8

Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Zinc spray significantly improved elongation of terminal shoot, number of leaves and leaf area per shoot in guava.

Treatment
zinc spraye1
Outcome
elongation of terminal shoot, number of leaves, leaf area per shoote1
Direction
improvemente1

Not reportedComparator

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

Psidium guajava
Psidium guajava · TaxonFuadsyazwan ( talk ) · Public domain · Wikimedia Commons ↗

Verbatim

e0

“The guava trees were sprayed with 0.0%, 0.2% and 0.4% zinc sulphate solutions”

✓ located verbatim in the source · abstract, characters 108–185 · show in text ↑
e1

“Significant improvement in growth characters, i.e., elongation of terminal shoot, number of leaves, leaf area per shoot and chlorophyll recovery was observed with zinc spray”

✓ located verbatim in the source · abstract, characters 213–386 · show in text ↑
Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Zinc spray significantly improved chlorophyll recovery in guava.

Treatment
zinc spraye1
Outcome
chlorophyll recoverye1
Direction
improvemente1

Not reportedComparator

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

Psidium guajava
Psidium guajava · TaxonFuadsyazwan ( talk ) · Public domain · Wikimedia Commons ↗

Verbatim

e0

“The guava trees were sprayed with 0.0%, 0.2% and 0.4% zinc sulphate solutions”

✓ located verbatim in the source · abstract, characters 108–185 · show in text ↑
e1

“Significant improvement in growth characters, i.e., elongation of terminal shoot, number of leaves, leaf area per shoot and chlorophyll recovery was observed with zinc spray”

✓ located verbatim in the source · abstract, characters 213–386 · show in text ↑
Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Zinc spray significantly reduced the time to fruit maturity in guava.

Treatment
zinc spraye2
Outcome
time for fruit maturitye2
Direction
reducede2

Not reportedComparator

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

Psidium guajava
Psidium guajava · TaxonFuadsyazwan ( talk ) · Public domain · Wikimedia Commons ↗

Verbatim

e0

“The guava trees were sprayed with 0.0%, 0.2% and 0.4% zinc sulphate solutions”

✓ located verbatim in the source · abstract, characters 108–185 · show in text ↑
e2

“The zinc spray also significantly reduced the time for fruit maturity and increased fruit yield significantly”

✓ located verbatim in the source · abstract, characters 388–497 · show in text ↑
Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Zinc spray significantly increased fruit yield in guava.

Treatment
zinc spraye2
Outcome
fruit yielde2
Direction
increasede2

Not reportedComparator

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

Psidium guajava
Psidium guajava · TaxonFuadsyazwan ( talk ) · Public domain · Wikimedia Commons ↗

Verbatim

e0

“The guava trees were sprayed with 0.0%, 0.2% and 0.4% zinc sulphate solutions”

✓ located verbatim in the source · abstract, characters 108–185 · show in text ↑
e2

“The zinc spray also significantly reduced the time for fruit maturity and increased fruit yield significantly”

✓ located verbatim in the source · abstract, characters 388–497 · show in text ↑
Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Zinc spray significantly improved fruit weight, length and diameter in guava.

Treatment
zinc spraye2
Outcome
Fruit weight, length, diametere3
Direction
improvemente3

Not reportedComparator

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

Psidium guajava
Psidium guajava · TaxonFuadsyazwan ( talk ) · Public domain · Wikimedia Commons ↗

Verbatim

e0

“The guava trees were sprayed with 0.0%, 0.2% and 0.4% zinc sulphate solutions”

✓ located verbatim in the source · abstract, characters 108–185 · show in text ↑
e2

“The zinc spray also significantly reduced the time for fruit maturity and increased fruit yield significantly”

✓ located verbatim in the source · abstract, characters 388–497 · show in text ↑
e3

“The significant improvement was also recorded on Fruit weight, length, diameter, reducing sugars, Vitamin C, pectic substances and total soluble solids”

✓ located verbatim in the source · abstract, characters 499–650 · show in text ↑
Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Zinc spray significantly improved reducing sugars, Vitamin C and pectic substances in guava fruit.

Treatment
zinc spraye2
Outcome
reducing sugars, Vitamin C, pectic substancese3
Direction
improvemente3

Not reportedComparator

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

Psidium guajava
Psidium guajava · TaxonFuadsyazwan ( talk ) · Public domain · Wikimedia Commons ↗

Verbatim

e0

“The guava trees were sprayed with 0.0%, 0.2% and 0.4% zinc sulphate solutions”

✓ located verbatim in the source · abstract, characters 108–185 · show in text ↑
e2

“The zinc spray also significantly reduced the time for fruit maturity and increased fruit yield significantly”

✓ located verbatim in the source · abstract, characters 388–497 · show in text ↑
e3

“The significant improvement was also recorded on Fruit weight, length, diameter, reducing sugars, Vitamin C, pectic substances and total soluble solids”

✓ located verbatim in the source · abstract, characters 499–650 · show in text ↑
Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Zinc spray significantly improved total soluble solids in guava fruit.

Treatment
zinc spraye2
Outcome
total soluble solidse3
Direction
improvemente3

Not reportedComparator

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

Psidium guajava
Psidium guajava · TaxonFuadsyazwan ( talk ) · Public domain · Wikimedia Commons ↗

Verbatim

e0

“The guava trees were sprayed with 0.0%, 0.2% and 0.4% zinc sulphate solutions”

✓ located verbatim in the source · abstract, characters 108–185 · show in text ↑
e2

“The zinc spray also significantly reduced the time for fruit maturity and increased fruit yield significantly”

✓ located verbatim in the source · abstract, characters 388–497 · show in text ↑
e3

“The significant improvement was also recorded on Fruit weight, length, diameter, reducing sugars, Vitamin C, pectic substances and total soluble solids”

✓ located verbatim in the source · abstract, characters 499–650 · show in text ↑
Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Zinc spray significantly reduced acidity of guava fruit.

Treatment
zinc spraye2
Outcome
aciditye4
Direction
reductione4

Not reportedComparator

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

Psidium guajava
Psidium guajava · TaxonFuadsyazwan ( talk ) · Public domain · Wikimedia Commons ↗

Verbatim

e0

“The guava trees were sprayed with 0.0%, 0.2% and 0.4% zinc sulphate solutions”

✓ located verbatim in the source · abstract, characters 108–185 · show in text ↑
e2

“The zinc spray also significantly reduced the time for fruit maturity and increased fruit yield significantly”

✓ located verbatim in the source · abstract, characters 388–497 · show in text ↑
e4

“And significant reduction in acidity”

✓ located verbatim in the source · abstract, characters 652–688 · show in text ↑

zinc atom · phenology · Psidium guajava (guava)Results agree

2 papers: 2 positive, 0 negative or no effect

1 paper in the same direction as this paper

  1. positive
See all 2 papers →

zinc atom · physiology: pigments · Psidium guajava (guava)Results agree

2 papers: 2 positive, 0 negative or no effect

1 paper in the same direction as this paper

  1. positive
See all 2 papers →

zinc atom · quality: sugar starch · Psidium guajava (guava)Results agree

10 papers: 10 positive, 0 negative or no effect

9 papers in the same direction as this paper

  1. positive
  2. positive
  3. positive

6 papers more in this group

See all 10 papers →

zinc atom · growth · Psidium guajava (guava)Results agree

13 papers: 13 positive, 0 negative or no effect

12 papers in the same direction as this paper

  1. positive
  2. positive
  3. positive

9 papers more in this group

See all 13 papers →

zinc atom · yield · Psidium guajava (guava)Results agree

21 papers: 21 positive, 0 negative or no effect

20 papers in the same direction as this paper

  1. positive
  2. positive
  3. positive

17 papers more in this group

See all 21 papers →

application · physiology: pigments · Psidium guajava (guava)Positive and negative results

9 papers: 8 positive, 1 negative or no effect

7 papers in the same direction as this paper · 1 in the opposite direction

  1. no effect
  2. positive
  3. positive

5 papers more in this group

See all 9 papers →

application · growth · Psidium guajava (guava)Positive and negative results

29 papers: 28 positive, 1 negative or no effect

27 papers in the same direction as this paper · 1 in the opposite direction

  1. no effect
  2. positive
  3. positive

25 papers more in this group

See all 29 papers →

application · quality: sugar starch · Psidium guajava (guava)Positive and negative results

30 papers: 29 positive, 1 negative or no effect

28 papers in the same direction as this paper · 1 in the opposite direction

  1. no effect
  2. positive
  3. positive

26 papers more in this group

See all 30 papers →

8 of 10 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.

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.