Abstract
Lettuce plants (Lactuca sativa L. var. Ithaca) were transplanted on different beige and black paper mulches and on a coextruded white/black polyethylene mulch in organic soil in 1997 and 1998. Non-weeded and weeded control plots were also used. Plant mortality in 1997 for plants grown on bare soil was 10 to 15% greater than that of mulched plants. Head weight was found to be 3.6 times (1997) and 12 times (1998) greater for lettuce grown on mulch compared with a weeded control. The transmission, reflection and absorption of light of the white/black polyethylene mulch and black paper mulch remained stable over the course of the experiment while those of the other papers changed over time. Paper mulch decomposition occurred during the experiment. Although, black paper mulch was the only mulch that gave complete control of weed growth, weed populations present under the beige papers were too small in terms of the size and number of weeds to cause lettuce yield reduction.
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Claims 8
Claim · model-written summary
Bare soil had 10 to 15% greater lettuce mortality than mulch in 1997.
Verbatim
e0“Plant mortality in 1997 for plants grown on bare soil was 10 to 15% greater than that of mulched plants.”
Claim · model-written summary
Mulch increased lettuce head weight 3.6 times relative to weeded control in 1997.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- mulche0
- Outcome
- Head weighte0
- Direction
- greatere0
- Value
- 3.6 timese0
- Qualifier
- 1997e0
- Comparator
- a weeded controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Head weight was found to be 3.6 times (1997) and 12 times (1998) greater for lettuce grown on mulch compared with a weeded control.”
Claim · model-written summary
Mulch increased lettuce head weight 12 times relative to weeded control in 1998.
- Taxon
- lettuceLactuca sativae0
- Treatment
- mulche0
- Outcome
- Head weighte0
- Direction
- greatere0
- Value
- 12 timese0
- Qualifier
- 1998e0
- Comparator
- a weeded controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Head weight was found to be 3.6 times (1997) and 12 times (1998) greater for lettuce grown on mulch compared with a weeded control.”
Claim · model-written summary
The optical properties of white/black polyethylene mulch and black paper mulch remained stable.
- Treatment
- white/black polyethylene mulch and black paper mulche0
- Outcome
- transmission, reflection and absorption of lighte0
- Direction
- remained stablee0
Not reportedTaxon
Verbatim
e0“The transmission, reflection and absorption of light of the white/black polyethylene mulch and black paper mulch remained stable over the course of the experiment”
Claim · model-written summary
The optical properties of other paper mulches changed over time.
Not reportedTaxon
Verbatim
e0“while those of the other papers changed over time.”
Claim · model-written summary
Paper mulch decomposed during the experiment.
- Outcome
- Paper mulch decompositione0
Not reportedTaxon
Verbatim
e0“Paper mulch decomposition occurred during the experiment.”
Claim · model-written summary
Black paper mulch completely controlled weed growth.
- Treatment
- black paper mulche0
- Interactor
- weede0weed
- Outcome
- weed growthe0
- Direction
- complete controle0
- Comparator
- the only mulche0
Not reportedTaxon
Verbatim
e0“black paper mulch was the only mulch that gave complete control of weed growth”
Claim · model-written summary
Weeds under beige papers were too few and small to reduce lettuce yield.
- Taxon
- lettuceLactuca sativae0
- Treatment
- beige paperse0
- Interactor
- weedse0weed
- Outcome
- lettuce yield reductione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weed populations present under the beige papers were too small in terms of the size and number of weeds to cause lettuce yield reduction.”
The same questions in other papers
mulching · yield · Lactuca sativa (garden lettuce)Positive and negative results
18 papers in the same direction as this paper · 5 in the opposite direction
- positive
- no effect
- negative
20 papers more in this group
See all 24 papers →mulching · weed · Lactuca sativa (garden lettuce)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 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.