Paper · 2015 · South African Journal of Plant and Soil

Field evaluation of deficit irrigation effects on tomato growth performance, water-use efficiency and control of parasitic nematode infection

Osama Mohawesh

11
claims
21
verbatim quotes
12
citations
3
research areas
—
Not open access

Abstract

Two field experiments were conducted using a common tomato cultivar (GS12) to assess the effect of deficit irrigation (DI) regimes on tomato growth performance, and on root-knot nematode Meloidogyne javanica galling and abundance. Irrigation treatments consisted of five irrigation regimes: 20%, 40%, 60%, 80% and 100% of field capacity. The results showed that DI decreased significantly leaf area, relative water content, water potential, minerals content and chlorophyll content. The 80% irrigation regime caused minor reductions in plant growth, but significantly reduced nematode infection load. Nematode infection was reduced even further at higher levels of water deficit, but this also led to marked reductions in fresh and dry weights of tomato. Total tomato yield, fruit soluble solids, and acidity were decreased with increasing irrigation water deficit. Water-use efficiency was lowest in the 100% irrigation regime and highest in the 20% irrigation regime among the irrigation treatments. The results indicated that the DI at a certain limit decreased M. javanica infection without causing significant reductions in tomato growth performance.

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Claims 11

Intervention effectobservedoriginal resultnegativesignificant (as stated)measured

Claim · model-written summary

Deficit irrigation decreased tomato leaf area, relative water content and water potential.

Material
GS12e0
Treatment
DIe1
Outcome
leaf area, relative water content, water potentiale1
Direction
decreasede1
Setting
field experimentse0

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

e0

“Two field experiments were conducted using a common tomato cultivar (GS12) to assess the effect of deficit irrigation (DI) regimes on tomato growth performance, and on root-knot nematode Meloidogyne javanica galling and abundance”

✓ located verbatim in the source · abstract, characters 0–229 · show in text ↑
e1

“The results showed that DI decreased significantly leaf area, relative water content, water potential, minerals content and chlorophyll content”

✓ located verbatim in the source · abstract, characters 338–481 · show in text ↑
Intervention effectobservedoriginal resultnegativesignificant (as stated)measured

Claim · model-written summary

Deficit irrigation decreased tomato minerals content and chlorophyll content.

Material
GS12e0
Treatment
DIe1
Outcome
minerals content and chlorophyll contente1
Direction
decreasede1
Setting
field experimentse0

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

e0

“Two field experiments were conducted using a common tomato cultivar (GS12) to assess the effect of deficit irrigation (DI) regimes on tomato growth performance, and on root-knot nematode Meloidogyne javanica galling and abundance”

✓ located verbatim in the source · abstract, characters 0–229 · show in text ↑
e1

“The results showed that DI decreased significantly leaf area, relative water content, water potential, minerals content and chlorophyll content”

✓ located verbatim in the source · abstract, characters 338–481 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

The 80% irrigation regime caused minor reductions in tomato plant growth.

Treatment
80% irrigation regimee2
Outcome
plant growthe2
Direction
minor reductionse2

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

e0

“Two field experiments were conducted using a common tomato cultivar (GS12) to assess the effect of deficit irrigation (DI) regimes on tomato growth performance, and on root-knot nematode Meloidogyne javanica galling and abundance”

✓ located verbatim in the source · abstract, characters 0–229 · show in text ↑
e2

“The 80% irrigation regime caused minor reductions in plant growth, but significantly reduced nematode infection load”

✓ located verbatim in the source · abstract, characters 483–599 · show in text ↑
Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

The 80% irrigation regime significantly reduced Meloidogyne javanica infection load in tomato.

Treatment
80% irrigation regimee2
Interactor
Meloidogyne javanicaMeloidogyne javanicae0pathogen
Outcome
nematode infection loade2
Direction
reducede2

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

e0

“Two field experiments were conducted using a common tomato cultivar (GS12) to assess the effect of deficit irrigation (DI) regimes on tomato growth performance, and on root-knot nematode Meloidogyne javanica galling and abundance”

✓ located verbatim in the source · abstract, characters 0–229 · show in text ↑
e2

“The 80% irrigation regime caused minor reductions in plant growth, but significantly reduced nematode infection load”

✓ located verbatim in the source · abstract, characters 483–599 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Higher water deficit reduced nematode infection further in tomato.

Treatment
higher levels of water deficite3
Interactor
Meloidogyne javanicaMeloidogyne javanicae0pathogen
Outcome
Nematode infectione3
Direction
reduced even furthere3

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

e0

“Two field experiments were conducted using a common tomato cultivar (GS12) to assess the effect of deficit irrigation (DI) regimes on tomato growth performance, and on root-knot nematode Meloidogyne javanica galling and abundance”

✓ located verbatim in the source · abstract, characters 0–229 · show in text ↑
e3

“Nematode infection was reduced even further at higher levels of water deficit, but this also led to marked reductions in fresh and dry weights of tomato”

✓ located verbatim in the source · abstract, characters 601–753 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Higher water deficit markedly reduced fresh and dry weights of tomato.

Treatment
higher levels of water deficite3
Outcome
fresh and dry weightse3
Direction
reductionse3
Qualifier
markede3

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

e3

“Nematode infection was reduced even further at higher levels of water deficit, but this also led to marked reductions in fresh and dry weights of tomato”

✓ located verbatim in the source · abstract, characters 601–753 · show in text ↑
Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Increasing irrigation water deficit decreased total tomato yield, fruit soluble solids and acidity.

Treatment
increasing irrigation water deficite4
Outcome
Total tomato yield, fruit soluble solids, and aciditye4
Direction
decreasede4

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

e0

“Two field experiments were conducted using a common tomato cultivar (GS12) to assess the effect of deficit irrigation (DI) regimes on tomato growth performance, and on root-knot nematode Meloidogyne javanica galling and abundance”

✓ located verbatim in the source · abstract, characters 0–229 · show in text ↑
e4

“Total tomato yield, fruit soluble solids, and acidity were decreased with increasing irrigation water deficit”

✓ located verbatim in the source · abstract, characters 755–864 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Water-use efficiency was lowest in the 100% irrigation regime among the irrigation treatments.

Treatment
100% irrigation regimee5
Outcome
Water-use efficiencye5
Direction
loweste5
Comparator
irrigation treatmentse5

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

e0

“Two field experiments were conducted using a common tomato cultivar (GS12) to assess the effect of deficit irrigation (DI) regimes on tomato growth performance, and on root-knot nematode Meloidogyne javanica galling and abundance”

✓ located verbatim in the source · abstract, characters 0–229 · show in text ↑
e5

“Water-use efficiency was lowest in the 100% irrigation regime and highest in the 20% irrigation regime among the irrigation treatments”

✓ located verbatim in the source · abstract, characters 866–1000 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Water-use efficiency was highest in the 20% irrigation regime among the irrigation treatments.

Treatment
20% irrigation regimee5
Outcome
Water-use efficiencye5
Direction
higheste5
Comparator
irrigation treatmentse5

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

e0

“Two field experiments were conducted using a common tomato cultivar (GS12) to assess the effect of deficit irrigation (DI) regimes on tomato growth performance, and on root-knot nematode Meloidogyne javanica galling and abundance”

✓ located verbatim in the source · abstract, characters 0–229 · show in text ↑
e5

“Water-use efficiency was lowest in the 100% irrigation regime and highest in the 20% irrigation regime among the irrigation treatments”

✓ located verbatim in the source · abstract, characters 866–1000 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Deficit irrigation at a certain limit decreased Meloidogyne javanica infection in tomato.

Treatment
the DI at a certain limite6
Interactor
M. javanicaMeloidogyne javanicae6pathogen
Outcome
M. javanica infectione6
Direction
decreasede6

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

e0

“Two field experiments were conducted using a common tomato cultivar (GS12) to assess the effect of deficit irrigation (DI) regimes on tomato growth performance, and on root-knot nematode Meloidogyne javanica galling and abundance”

✓ located verbatim in the source · abstract, characters 0–229 · show in text ↑
e6

“The results indicated that the DI at a certain limit decreased M. javanica infection without causing significant reductions in tomato growth performance”

✓ located verbatim in the source · abstract, characters 1002–1154 · show in text ↑
Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Deficit irrigation at a certain limit did not significantly reduce tomato growth performance.

Treatment
the DI at a certain limite6
Outcome
tomato growth performancee6
Direction
without causing significant reductionse6

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

e0

“Two field experiments were conducted using a common tomato cultivar (GS12) to assess the effect of deficit irrigation (DI) regimes on tomato growth performance, and on root-knot nematode Meloidogyne javanica galling and abundance”

✓ located verbatim in the source · abstract, characters 0–229 · show in text ↑
e6

“The results indicated that the DI at a certain limit decreased M. javanica infection without causing significant reductions in tomato growth performance”

✓ located verbatim in the source · abstract, characters 1002–1154 · show in text ↑

irrigation · physiology: pigments · Solanum lycopersicum (tomato)Positive and negative results

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8 papers in the same direction as this paper · 20 in the opposite direction

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drought · growth · Solanum lycopersicum (tomato)Positive and negative results

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irrigation · physiology: water · Solanum lycopersicum (tomato)Positive and negative results

147 papers: 117 positive, 30 negative or no effect

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irrigation · growth · Solanum lycopersicum (tomato)Positive and negative results

175 papers: 106 positive, 69 negative or no effect

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irrigation · Meloidogyne javanica · Solanum lycopersicum (tomato)Results agree

5 papers: 5 positive, 0 negative or no effect

4 papers in the same direction as this paper

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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.