Abstract
ABSTRACT Subsurface drip and furrow irrigation were compared on lettuce (Lactuca sativa) cvs. Salinas and Misty Day for yield and incidence and severity of three important diseases of lettuce in the Salinas Valley, CA. Experiments were conducted between 1993 and 1995 during the spring and fall seasons. The diseases examined included lettuce drop (Sclerotinia minor), downy mildew (Bremia lactucae), and corky root (Rhizomonas suberifaciens). Replicated plots of subsurface drip and furrow irrigation were arranged in a randomized complete-block design. All plants were inoculated with S. minor at the initiation of the experiment during the 1993 spring season. Plots were not inoculated for downy mildew and corky root during any season nor were the plots reinoculated with S. minor. During each season, all plots were sprinkler irrigated until thinning, and subsequently, the irrigation treatments were begun. The furrow plots were irrigated once per week, and the drip plots received water twice per week. The distribution of soil moisture at two soil depths (0 to 5 and 6 to 15 cm) at 5, 10, and 15 cm distance on either side of the bed center in two diagonal directions was significantly lower in drip-irrigated compared with furrow-irrigated plots. Plots were evaluated for lettuce drop incidence and downy mildew incidence and severity at weekly intervals until harvest. Corky root severity and yield components were determined at maturity. Lettuce drop incidence and corky root severity were significantly lower and yields were higher in plots under subsurface drip irrigation compared with furrow irrigation, regardless of the cultivar, except during the 1994 fall season. Incidence and severity of downy mildew were not significantly different between the two irrigation methods throughout the study. The differential microclimates created by the two irrigation treatments did not affect downy mildew infection, presumably because the mesoclimate is usually favorable in the Salinas Valley. Subsurface drip irrigation is a viable, long-term strategy for soilborne disease management in lettuce in the Salinas Valley.
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Claims 7
Claim · model-written summary
Soil moisture was lower under drip irrigation than furrow irrigation.
- Taxon
- lettuce (Lactuca sativa)
Lactuca sativae1 - Treatment
- drip-irrigatede0
- Outcome
- distribution of soil moisturee0
- Direction
- lowere0
- Comparator
- furrow-irrigatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The distribution of soil moisture at two soil depths (0 to 5 and 6 to 15 cm) at 5, 10, and 15 cm distance on either side of the bed center in two diagonal directions was significantly lower in drip-irrigated compared with furrow-irrigated plots”
e1“lettuce (Lactuca sativa)”
Claim · model-written summary
Subsurface drip irrigation lowered lettuce drop incidence.
- Taxon
- lettuce (Lactuca sativa)Lactuca sativae1
- Treatment
- subsurface drip irrigatione0
- Interactor
- Sclerotinia minorSclerotinia minore2pathogen
- Outcome
- Lettuce drop incidencee0
- Direction
- lowere0
- Qualifier
- except during the 1994 fall seasone0
- Comparator
- furrow irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce drop incidence and corky root severity were significantly lower and yields were higher in plots under subsurface drip irrigation compared with furrow irrigation, regardless of the cultivar, except during the 1994 fall season”
e1“lettuce (Lactuca sativa)”
e2“lettuce drop (Sclerotinia minor)”
Claim · model-written summary
Subsurface drip irrigation lowered corky root severity.
- Taxon
- lettuce (Lactuca sativa)Lactuca sativae1
- Treatment
- subsurface drip irrigatione0
- Interactor
- Rhizomonas suberifaciensRhizorhapis suberifaciense2pathogen
- Outcome
- corky root severitye0
- Direction
- lowere0
- Qualifier
- except during the 1994 fall seasone0
- Comparator
- furrow irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce drop incidence and corky root severity were significantly lower and yields were higher in plots under subsurface drip irrigation compared with furrow irrigation, regardless of the cultivar, except during the 1994 fall season”
e1“lettuce (Lactuca sativa)”
e2“corky root (Rhizomonas suberifaciens)”
Claim · model-written summary
Subsurface drip irrigation raised lettuce yields.
- Taxon
- lettuce (Lactuca sativa)Lactuca sativae1
- Treatment
- subsurface drip irrigatione0
- Outcome
- yieldse0
- Direction
- highere0
- Qualifier
- except during the 1994 fall seasone0
- Comparator
- furrow irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce drop incidence and corky root severity were significantly lower and yields were higher in plots under subsurface drip irrigation compared with furrow irrigation, regardless of the cultivar, except during the 1994 fall season”
e1“lettuce (Lactuca sativa)”
Claim · model-written summary
Downy mildew incidence did not differ significantly between irrigation methods.
- Taxon
- lettuce (Lactuca sativa)Lactuca sativae1
- Treatment
- two irrigation methodse0
- Interactor
- Bremia lactucae
.jpg?width=60)
Bremia lactucaee2pathogen - Outcome
- Incidencee0
- Direction
- not significantly differente0
- Comparator
- two irrigation methodse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Incidence and severity of downy mildew were not significantly different between the two irrigation methods throughout the study”
e1“lettuce (Lactuca sativa)”
e2“downy mildew (Bremia lactucae)”
Claim · model-written summary
Downy mildew severity did not differ significantly between irrigation methods.
- Taxon
- lettuce (Lactuca sativa)Lactuca sativae1
- Treatment
- two irrigation methodse0
- Interactor
- Bremia lactucaeBremia lactucaee2pathogen
- Outcome
- severity of downy mildewe0
- Direction
- not significantly differente0
- Comparator
- two irrigation methodse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Incidence and severity of downy mildew were not significantly different between the two irrigation methods throughout the study”
e1“lettuce (Lactuca sativa)”
e2“downy mildew (Bremia lactucae)”
Claim · model-written summary
The authors recommend subsurface drip irrigation for long-term soilborne disease management in lettuce.
- Taxon
- lettuceLactuca sativae0
- Outcome
- Subsurface drip irrigation is a viable, long-term strategy for soilborne disease managemente0
- Setting
- Salinas Valleye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsurface drip irrigation is a viable, long-term strategy for soilborne disease management in lettuce in the Salinas Valley”
The same questions in other papers
irrigation · Bremia lactucae · Lactuca sativa (garden lettuce)Positive and negative results
1 reporting no difference from an alternative
- positive
irrigation · Sclerotinia minor · Lactuca sativa (garden lettuce)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
irrigation · yield · Lactuca sativa (garden lettuce)Positive and negative results
31 papers in the same direction as this paper · 23 in the opposite direction · 2 reporting no difference from an alternative
- negative
- negative
- no effect
53 papers more in this group
See all 57 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.