Abstract
A Clovelly soil in Tala Valley (Natal) was fumigated with different concentrations of dazomet (300, 400, 500 kg ha−1) (granular formulation), and metham sodium (500, 750, 1000 L ha−1) (liquid formulation). Half the treatments were covered with plastic sheets during fumigation. After fumigation weed germination was rated and soil analysed for parasitic nematodes. The trial site was planted with ‘Robinvale’ lettuce seedlings. Dazomet was more effective than metham sodium in decreasing weed germination and efficacy of both chemicals was improved by covering the sites with plastic. Meloidogyne (root-knot nematode) and Trichodorus (stubby root nematode) were present prior to fumigation but their levels were reduced by dazomet. Nematode control by metham sodium was inconsistent and not improved by higher concentrations of fumigant. Nematode populations were counted again at harvest from both soil and root samples. These results were variable and could not be directly related to treatments. Dazomet significantly increased lettuce yields from 81 ha−1 (control) to 44 t ha−1 (500 kg ha−1 dazomet). Fumigation with metham sodium and covering with plastic sheets did not significantly improve yields.
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Claims 7
Claim · model-written summary
Dazomet significantly increased lettuce yield, from 81 ha-1 in the control to 44 t ha-1 at 500 kg ha-1 dazomet, in a fumigated Clovelly soil in Tala Valley.
- Taxon
- lettuce
Lactuca sativae1 - Treatment
- dazomete1
- Outcome
- lettuce yieldse1
- Direction
- increasede1
- Value
- 44 t ha−1e1
- Qualifier
- 81 ha−1e1
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Dazomet significantly increased lettuce yields from 81 ha−1 (control) to 44 t ha−1 (500 kg ha−1 dazomet)”
Claim · model-written summary
Fumigation with metham sodium combined with plastic covering did not significantly improve lettuce yield.
- Taxon
- lettuceLactuca sativae1
- Treatment
- Fumigation with metham sodium and covering with plastic sheetse2
- Outcome
- yieldse2
- Direction
- did not significantly improvee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The trial site was planted with ‘Robinvale’ lettuce seedlings”
e2“Fumigation with metham sodium and covering with plastic sheets did not significantly improve yields”
Claim · model-written summary
Dazomet was more effective than metham sodium in decreasing weed germination in lettuce soil.
- Taxon
- lettuceLactuca sativae1
- Treatment
- dazomete2
- Outcome
- weed germinatione2
- Direction
- decreasinge2
- Comparator
- metham sodiume2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The trial site was planted with ‘Robinvale’ lettuce seedlings”
e2“Dazomet was more effective than metham sodium in decreasing weed germination and efficacy of both chemicals was improved by covering the sites with plastic”
Claim · model-written summary
Covering the sites with plastic improved the efficacy of both chemicals (dazomet and metham sodium).
- Taxon
- lettuceLactuca sativae1
- Treatment
- covering the sites with plastice2
- Outcome
- efficacy of both chemicalse2
- Direction
- improvede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The trial site was planted with ‘Robinvale’ lettuce seedlings”
e2“Dazomet was more effective than metham sodium in decreasing weed germination and efficacy of both chemicals was improved by covering the sites with plastic”
Claim · model-written summary
Dazomet reduced the levels of Meloidogyne and Trichodorus nematodes in lettuce soil relative to their levels before fumigation.
- Taxon
- lettuceLactuca sativae1
- Treatment
- dazomete2
- Interactor
- Meloidogyne
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=60)
Meloidogynee2pest - Second interactor
- Trichodorus
Trichodoruse2pest - Outcome
- levelse2
- Direction
- reducede2
- Comparator
- prior to fumigatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=500)
Verbatim
e1“The trial site was planted with ‘Robinvale’ lettuce seedlings”
e2“Meloidogyne (root-knot nematode) and Trichodorus (stubby root nematode) were present prior to fumigation but their levels were reduced by dazomet”
Claim · model-written summary
Metham sodium nematode control was inconsistent and was not improved by higher fumigant concentrations.
- Taxon
- lettuceLactuca sativae1
- Treatment
- metham sodiume2
- Outcome
- Nematode controle2
- Direction
- not improvede2
- Qualifier
- inconsistente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The trial site was planted with ‘Robinvale’ lettuce seedlings”
e2“Nematode control by metham sodium was inconsistent and not improved by higher concentrations of fumigant”
Claim · model-written summary
Nematode populations counted at harvest were variable and could not be directly related to the treatments.
- Taxon
- lettuceLactuca sativae1
- Outcome
- Nematode populationse2
- Qualifier
- could not be directly related to treatmentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The trial site was planted with ‘Robinvale’ lettuce seedlings”
e2“Nematode populations were counted again at harvest from both soil and root samples. These results were variable and could not be directly related to treatments”
The same questions in other papers
sodium atom · yield · Lactuca sativa (garden lettuce)Positive and negative results
1 in the opposite direction
- positive
solarization · yield · Lactuca sativa (garden lettuce)Positive and negative results
6 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 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.