Abstract
A 7-year study located in Prince Edward Island, Canada, examined the influence of compost and manure on crop yield and nematode populations. The compost used in this study consisted of cull waste potatoes, sawdust, and beef manure in a 3:3:1 ratio, respectively. No plant-parasitic nematodes were detected in samples collected from windrow compost piles at 5- and 30-cm depths prior to application on field plots. Low population densities of bacterial-feeding nematodes were recovered from compost windrows at the 5-cm depth. Field plots of potato (Solanum tuberosum cv. Kennebec) received compost applied at 16 metric tonnes per hectare, or beef manure applied at 12 metric tonnes per hectare. An adjacent trial with barley (Hordeum vulgare cv. Mic Mac) received only the compost treatment. In both trials the experimental design was a complete randomized block with four replicates. Data averaged over seven growing seasons indicated that population levels of root-lesion nematodes (primarily Pratylenchus penetrans) were higher in root-zone soil in potato plots treated with either compost or manure compared to the untreated control plots. The soil amendments did not affect root-knot nematode (Meloidogyne hapla) population densities in the potato plots, but clover-cyst nematodes (Heterodera trifolii) were more numerous in the root-zone soils of barley treated with compost compared to the untreated plots. Numbers of bacterial-feeding nematodes (primarily Diplogaster lheritieri) were greater in soil in potato plots treated with manure and in soil around barley roots than in untreated plots. Total yields of potato tubers averaged over seven growing seasons increased by 27% in the plots treated with either compost or manure. Grain yields of barley also were increased by 12% when compost was applied. These results indicated that organic amendments increased crop yields, but the impacts on different nematode species varied and usually increased soil population levels.
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Claims 8
Claim · model-written summary
Compost or manure raised root lesion nematodes in potato root-zone soil.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- either compost or manuree0
- Interactor
- Pratylenchus penetrans
Pratylenchus penetranse0pathogen - Outcome
- population levels of root-lesion nematodese0
- Direction
- highere0
- Comparator
- untreated control plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“population levels of root-lesion nematodes (primarily Pratylenchus penetrans) were higher in root-zone soil in potato plots treated with either compost or manure compared to the untreated control plots”
Claim · model-written summary
Amendments did not affect root knot nematode density in potato plots.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- soil amendmentse0
- Interactor
- Meloidogyne hapla
Meloidogyne haplae0pathogen - Outcome
- root-knot nematode (Meloidogyne hapla) population densitiese0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soil amendments did not affect root-knot nematode (Meloidogyne hapla) population densities in the potato plots”
Claim · model-written summary
Compost raised clover cyst nematodes in barley root-zone soil.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- composte0
- Interactor
- Heterodera trifoliiHeterodera trifoliie0pathogen
- Outcome
- clover-cyst nematodes (Heterodera trifolii)e0
- Direction
- more numerouse0
- Comparator
- untreated plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“clover-cyst nematodes (Heterodera trifolii) were more numerous in the root-zone soils of barley treated with compost compared to the untreated plots”
Claim · model-written summary
Manure raised bacterial-feeding nematodes in potato plot soil.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- manuree0
- Outcome
- Numbers of bacterial-feeding nematodese0
- Direction
- greatere0
- Comparator
- untreated plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Numbers of bacterial-feeding nematodes (primarily Diplogaster lheritieri) were greater in soil in potato plots treated with manure and in soil around barley roots than in untreated plots”
Claim · model-written summary
Compost raised bacterial-feeding nematodes around barley roots.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- Numbers of bacterial-feeding nematodese0
- Direction
- greatere0
- Comparator
- untreated plotse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Numbers of bacterial-feeding nematodes (primarily Diplogaster lheritieri) were greater in soil in potato plots treated with manure and in soil around barley roots than in untreated plots”
Claim · model-written summary
Compost raised potato tuber yield by 27%.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- composte0
- Outcome
- Total yields of potato tuberse0
- Direction
- increasede0
- Value
- 27%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total yields of potato tubers averaged over seven growing seasons increased by 27% in the plots treated with either compost or manure”
Claim · model-written summary
Manure raised potato tuber yield by 27%.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- manuree0
- Outcome
- Total yields of potato tuberse0
- Direction
- increasede0
- Value
- 27%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total yields of potato tubers averaged over seven growing seasons increased by 27% in the plots treated with either compost or manure”
Claim · model-written summary
Compost raised barley grain yield by 12%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields of barley also were increased by 12% when compost was applied”
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See all 550 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.