Abstract
Composts may be used either in soilless cultivation or applied to soil, increasing its organic matter content and improving the physical, chemical and biological properties. This study evaluated the effects of compost application to the soil cropped with carrot on nematodes diversity, biocontrol of phytopathogenic nematodes and crop yield. A commercial compost (Organical®, TerraFértil, Portugal) was applied to a sandy soil, at the rate of 0, 12.5, 25, 50 and 100 t ha-1 and incorporated to a 15 cm depth. A carrot crop (Daucus carota L.) was sown with a density of 62.5 plants m-2. At the end of the growing period, when the longer roots had reached about 15 cm, plant growth and yield were quantified. Compost increased carrot yield. Following harvest, soil samples were collected near the roots (root zone) and randomly at three soil depths: 0 to 15 cm, at 30 cm and at 50 cm. Nematodes species were identified and quantified in these four zones, and the damages observed were ranked. Compost influenced nematode populations. Near the roots beneficial nematode populations increased with the compost rate application. Phytopathogenic nematodes were present mainly in the treatments with less compost. Furthermore, nematode genera were distributed according to soil depth. Bacteriophage/saprophyte nematodes were found mainly at 50 cm depth, at the surface and in the root zone. Plant parasitic nematodes were located near the surface (0-15 cm) and at 50 cm depth. Predator nematodes prevailed near the surface, in the root zone and at 50 cm depth. The lower populations of nematodes were found at 30 cm depth. This work showed that the dynamics of nematode populations in the soil is affected by soil depth and compost dose, suggesting that compost can reduce the population of phytopathogenic nematodes and increase bacteriophage/saprophyte and predator nematode populations.
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Claims 10
Claim · model-written summary
Compost application increased carrot yield.
- Taxon
- carrot
Daucus carotat0 - Treatment
- Composte0
- Outcome
- carrot yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“Compost increased carrot yield”
Claim · model-written summary
Near the carrot roots, beneficial nematode populations increased with compost rate.
- Taxon
- carrotDaucus carotat0
- Organ / stage
- Near the rootse0
- Treatment
- compost rate applicatione0
- Interactor
- beneficial nematodee0other
- Outcome
- beneficial nematode populationse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“Near the roots beneficial nematode populations increased with the compost rate application”
Claim · model-written summary
Phytopathogenic nematodes occurred mainly in the carrot treatments with less compost.
- Taxon
- carrotDaucus carotat0
- Treatment
- composte0
- Interactor
- Phytopathogenic nematodese0pathogen
- Outcome
- Phytopathogenic nematodes were presente0
- Direction
- lowerinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“Phytopathogenic nematodes were present mainly in the treatments with less compost”
Claim · model-written summary
Nematode genera were distributed according to soil depth in the carrot crop soil.
- Taxon
- carrotDaucus carotat0
- Outcome
- nematode genera were distributed according to soil depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“nematode genera were distributed according to soil depth”
Claim · model-written summary
Bacteriophage/saprophyte nematodes were found mainly at 50 cm depth, at the surface and in the root zone.
- Taxon
- carrotDaucus carotat0
- Outcome
- Bacteriophage/saprophyte nematodes were founde0
- Value
- 50 cm depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“Bacteriophage/saprophyte nematodes were found mainly at 50 cm depth, at the surface and in the root zone”
Claim · model-written summary
Plant parasitic nematodes were located near the surface (0-15 cm) and at 50 cm depth.
- Taxon
- carrotDaucus carotat0
- Outcome
- Plant parasitic nematodes were locatede0
- Value
- 50 cm depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“Plant parasitic nematodes were located near the surface (0-15 cm) and at 50 cm depth”
Claim · model-written summary
Predator nematodes prevailed near the surface, in the root zone and at 50 cm depth.
- Taxon
- carrotDaucus carotat0
- Outcome
- Predator nematodes prevailede0
- Value
- 50 cm depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“Predator nematodes prevailed near the surface, in the root zone and at 50 cm depth”
Claim · model-written summary
The lowest nematode populations were found at 30 cm depth.
- Taxon
- carrotDaucus carotat0
- Outcome
- lower populations of nematodese0
- Value
- 30 cm depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“The lower populations of nematodes were found at 30 cm depth”
Claim · model-written summary
The authors suggest that compost can reduce the population of phytopathogenic nematodes.
- Taxon
- carrotDaucus carotat0
- Treatment
- composte0
- Interactor
- phytopathogenic nematodese0pathogen
- Outcome
- population of phytopathogenic nematodese0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“suggesting that compost can reduce the population of phytopathogenic nematodes”
Claim · model-written summary
The authors suggest that compost can increase bacteriophage/saprophyte and predator nematode populations.
- Taxon
- carrotDaucus carotat0
- Outcome
- bacteriophage/saprophyte and predator nematode populationse0
- Direction
- increasee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“increase bacteriophage/saprophyte and predator nematode populations”
The same questions in other papers
fertilization · yield · Daucus carota (carrot)Results differ
107 papers in the same direction as this paper · 11 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- negative
- no effect
117 papers more in this group
See all 121 papers →fertilization · pest · Daucus carota (carrot)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.