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

Use of Growth Retardants for Increasing Tomato Yields and Adaptation for Mechanical Harvest1

Paul E. Read; D. J. Fieldhouse

9
claims
20
verbatim quotes
30
citations
2
research areas
✓
Open access · cc-by-nc-nd

Abstract

Abstract Yields of tomato cultivars ‘Heinz 1350’ and ‘Delaware 65S3-2’ (a mid-season processing variety) were increased by foliar sprays of succinic acid 2,2-dimethyl hydrazide (Alar) and 2-chloroethyl trimethylammonium chloride (Cycocel). The most effective treatments were those in which 2500 ppm Alar was applied at the first or fourth true leaf stage of growth or at both of these times. Concentration of harvest was improved and early yield was increased by subsequent application of 5000 ppm Alar as a flower “cut-off” spray after desired fruit set had been achieved. The latter treatment has desirable implications for mechanical harvesting, since it virtually eliminated green fruit “pick-out” and slowed vegetative growth, thus causing a more concentrated harvest because of more rapid fruit maturation. The yield increases are attributed to a combination of effects including resistance to water and heat stresses, more flowers per cluster and thus more fruits per plant. Additional hormone-like effects of Alar and certain Alar analogs were observed.

Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. 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 9

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Foliar sprays of Alar and Cycocel increased yields of two tomato cultivars.

Treatment
foliar sprays of succinic acid 2,2-dimethyl hydrazide (Alar)e1
Outcome
Yieldse1
Direction
increasede1

Not reportedComparator

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

Solanum lycopersicum
Solanum lycopersicum · TaxonKod B · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e1

“Yields of tomato cultivars ‘Heinz 1350’ and ‘Delaware 65S3-2’ (a mid-season processing variety) were increased by foliar sprays of succinic acid 2,2-dimethyl hydrazide (Alar) and 2-chloroethyl trimethylammonium chloride (Cycocel)”

✓ located verbatim in the source · abstract, characters 9–238 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

The most effective treatment was 2500 ppm Alar applied at the first or fourth true leaf stage, or at both.

Organ / stage
first or fourth true leaf stagee2
Treatment
2500 ppm Alare2
Outcome
most effectivee2
Direction
most effectivee2

Not reportedComparator

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

Solanum lycopersicum
Solanum lycopersicum · TaxonKod B · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e1

“Yields of tomato cultivars ‘Heinz 1350’ and ‘Delaware 65S3-2’ (a mid-season processing variety) were increased by foliar sprays of succinic acid 2,2-dimethyl hydrazide (Alar) and 2-chloroethyl trimethylammonium chloride (Cycocel)”

✓ located verbatim in the source · abstract, characters 9–238 · show in text ↑
e2

“The most effective treatments were those in which 2500 ppm Alar was applied at the first or fourth true leaf stage of growth or at both of these times”

✓ located verbatim in the source · abstract, characters 240–390 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Concentration of harvest was improved by a subsequent 5000 ppm Alar flower cut-off spray.

Treatment
5000 ppm Alare3
Outcome
Concentration of harveste3
Direction
improvede3

Not reportedComparator

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

Solanum lycopersicum
Solanum lycopersicum · TaxonKod B · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e1

“Yields of tomato cultivars ‘Heinz 1350’ and ‘Delaware 65S3-2’ (a mid-season processing variety) were increased by foliar sprays of succinic acid 2,2-dimethyl hydrazide (Alar) and 2-chloroethyl trimethylammonium chloride (Cycocel)”

✓ located verbatim in the source · abstract, characters 9–238 · show in text ↑
e3

“Concentration of harvest was improved and early yield was increased by subsequent application of 5000 ppm Alar as a flower “cut-off” spray after desired fruit set had been achieved”

✓ located verbatim in the source · abstract, characters 392–572 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Early yield was increased by a subsequent 5000 ppm Alar flower cut-off spray.

Treatment
5000 ppm Alare3
Outcome
early yielde3
Direction
increasede3

Not reportedComparator

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

Solanum lycopersicum
Solanum lycopersicum · TaxonKod B · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e1

“Yields of tomato cultivars ‘Heinz 1350’ and ‘Delaware 65S3-2’ (a mid-season processing variety) were increased by foliar sprays of succinic acid 2,2-dimethyl hydrazide (Alar) and 2-chloroethyl trimethylammonium chloride (Cycocel)”

✓ located verbatim in the source · abstract, characters 9–238 · show in text ↑
e3

“Concentration of harvest was improved and early yield was increased by subsequent application of 5000 ppm Alar as a flower “cut-off” spray after desired fruit set had been achieved”

✓ located verbatim in the source · abstract, characters 392–572 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

The 5000 ppm Alar cut-off spray virtually eliminated green fruit pick-out.

Treatment
5000 ppm Alare3
Outcome
green fruite4
Direction
virtually eliminatede4

Not reportedComparator

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

Solanum lycopersicum
Solanum lycopersicum · TaxonKod B · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e1

“Yields of tomato cultivars ‘Heinz 1350’ and ‘Delaware 65S3-2’ (a mid-season processing variety) were increased by foliar sprays of succinic acid 2,2-dimethyl hydrazide (Alar) and 2-chloroethyl trimethylammonium chloride (Cycocel)”

✓ located verbatim in the source · abstract, characters 9–238 · show in text ↑
e3

“Concentration of harvest was improved and early yield was increased by subsequent application of 5000 ppm Alar as a flower “cut-off” spray after desired fruit set had been achieved”

✓ located verbatim in the source · abstract, characters 392–572 · show in text ↑
e4

“it virtually eliminated green fruit “pick-out” and slowed vegetative growth”

✓ located verbatim in the source · abstract, characters 655–730 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

The 5000 ppm Alar cut-off spray slowed vegetative growth.

Treatment
5000 ppm Alare3
Outcome
vegetative growthe4
Direction
slowede4

Not reportedComparator

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

Solanum lycopersicum
Solanum lycopersicum · TaxonKod B · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e1

“Yields of tomato cultivars ‘Heinz 1350’ and ‘Delaware 65S3-2’ (a mid-season processing variety) were increased by foliar sprays of succinic acid 2,2-dimethyl hydrazide (Alar) and 2-chloroethyl trimethylammonium chloride (Cycocel)”

✓ located verbatim in the source · abstract, characters 9–238 · show in text ↑
e3

“Concentration of harvest was improved and early yield was increased by subsequent application of 5000 ppm Alar as a flower “cut-off” spray after desired fruit set had been achieved”

✓ located verbatim in the source · abstract, characters 392–572 · show in text ↑
e4

“it virtually eliminated green fruit “pick-out” and slowed vegetative growth”

✓ located verbatim in the source · abstract, characters 655–730 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

The 5000 ppm Alar cut-off spray gave more rapid fruit maturation.

Treatment
5000 ppm Alare3
Outcome
fruit maturatione5
Direction
more rapide5

Not reportedComparator

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

Solanum lycopersicum
Solanum lycopersicum · TaxonKod B · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e1

“Yields of tomato cultivars ‘Heinz 1350’ and ‘Delaware 65S3-2’ (a mid-season processing variety) were increased by foliar sprays of succinic acid 2,2-dimethyl hydrazide (Alar) and 2-chloroethyl trimethylammonium chloride (Cycocel)”

✓ located verbatim in the source · abstract, characters 9–238 · show in text ↑
e3

“Concentration of harvest was improved and early yield was increased by subsequent application of 5000 ppm Alar as a flower “cut-off” spray after desired fruit set had been achieved”

✓ located verbatim in the source · abstract, characters 392–572 · show in text ↑
e5

“thus causing a more concentrated harvest because of more rapid fruit maturation”

✓ located verbatim in the source · abstract, characters 732–811 · show in text ↑
Mechanismauthor interpretationoriginal resultpositivebasis n/a

Claim · model-written summary

The yield increases are attributed to resistance to water and heat stresses and to more flowers and fruits per plant.

Outcome
yield increasese6
Qualifier
resistance to water and heat stresses, more flowers per cluster and thus more fruits per plante6

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

Solanum lycopersicum
Solanum lycopersicum · TaxonKod B · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e1

“Yields of tomato cultivars ‘Heinz 1350’ and ‘Delaware 65S3-2’ (a mid-season processing variety) were increased by foliar sprays of succinic acid 2,2-dimethyl hydrazide (Alar) and 2-chloroethyl trimethylammonium chloride (Cycocel)”

✓ located verbatim in the source · abstract, characters 9–238 · show in text ↑
e6

“The yield increases are attributed to a combination of effects including resistance to water and heat stresses, more flowers per cluster and thus more fruits per plant”

✓ located verbatim in the source · abstract, characters 813–980 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

Additional hormone-like effects of Alar and certain Alar analogs were observed in tomato.

Treatment
Alar analogse7
Compound
Alare7
Outcome
hormone-like effectse7

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

Solanum lycopersicum
Solanum lycopersicum · TaxonKod B · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e1

“Yields of tomato cultivars ‘Heinz 1350’ and ‘Delaware 65S3-2’ (a mid-season processing variety) were increased by foliar sprays of succinic acid 2,2-dimethyl hydrazide (Alar) and 2-chloroethyl trimethylammonium chloride (Cycocel)”

✓ located verbatim in the source · abstract, characters 9–238 · show in text ↑
e7

“Additional hormone-like effects of Alar and certain Alar analogs were observed”

✓ located verbatim in the source · abstract, characters 982–1060 · show in text ↑

Daminozide · growth · Solanum lycopersicum (tomato)Results differ

9 papers: 6 positive, 3 negative or no effect

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

  1. no effect
  2. positive
  3. negative

5 papers more in this group

See all 9 papers →

Daminozide · yield · Solanum lycopersicum (tomato)Results differ

10 papers: 8 positive, 2 negative or no effect

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

  1. positive
  2. no effect
  3. negative

6 papers more in this group

See all 10 papers →

Daminozide · phenology · Solanum lycopersicum (tomato)Positive and negative results

2 papers: 1 positive, 1 negative or no effect

1 in the opposite direction

  1. negative
See all 2 papers →

succinic acid · yield · Solanum lycopersicum (tomato)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 →

application · yield · Solanum lycopersicum (tomato)Positive and negative results

296 papers: 261 positive, 35 negative or no effect

260 papers in the same direction as this paper · 33 in the opposite direction · 2 reporting no difference from an alternative

  1. positive
  2. no effect
  3. no effect

292 papers more in this group

See all 296 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.