Abstract
Peat mining destroys valuable nature areas and contributes to the greenhouse effect. This warrants the search for alternatives for peat in potting mixes. Composted biowaste could provide such an alternative. An additional advantage of (partially) replacing peat by compost is the increased disease suppressiveness. In this study, nine commercial composted biowastes were tested for disease suppressiveness using the pathosystems Pythium ultimum-cucumber, Phytophthora cinnamomi-lupin and Rhizoctonia solani-carrot. Increased disease suppression was found in compost-amended potting mixes for all three pathosystems. The level of disease suppression ranged from slight stimulation of disease to strong suppression. Suppressiveness against one disease was not well correlated with that against the other diseases. The CO2 production, a measure of general microbial activity, was the parameter most strongly correlated with the level of disease suppression. Wetsieving the biowaste with tap water over a 4-mm sieve prior to composting yielded a compost with an 2.4-fold increase in organic matter and a twofold decrease in EC and Cl--concentration of the compost. The latter reductions allow for an increase of the amount of peat that can be replaced by compost. A linear relation was found between the amount of compost added to the potting mix and the level of disease suppression indicating the potential for increasing disease suppressiveness of potting mixes by replacing peat by high-quality composted biowastes.
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Claims 7
Claim · model-written summary
Compost-amended potting mixes increased disease suppression in cucumber, lupin and carrot pathosystems.
- Taxon
- cucumber
Cucumis sativuse1 - Treatment
- compost-amended potting mixese0
- Outcome
- disease suppressione0
- Direction
- Increasede0
- Qualifier
- for all three pathosystemse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased disease suppression was found in compost-amended potting mixes for all three pathosystems”
e1“Pythium ultimum-cucumber, Phytophthora cinnamomi-lupin and Rhizoctonia solani-carrot”
Claim · model-written summary
Level of disease suppression by the nine composts ranged from slight stimulation of disease to strong suppression.
- Taxon
- cucumberCucumis sativuse1
- Outcome
- level of disease suppressione2
- Qualifier
- ranged from slight stimulation of disease to strong suppressione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pythium ultimum-cucumber, Phytophthora cinnamomi-lupin and Rhizoctonia solani-carrot”
e2“The level of disease suppression ranged from slight stimulation of disease to strong suppression”
Claim · model-written summary
Suppressiveness against one disease was not well correlated with suppressiveness against the other diseases.
- Taxon
- cucumberCucumis sativuse1
- Outcome
- Suppressiveness against one diseasee3
- Qualifier
- not well correlated with that against the other diseasese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pythium ultimum-cucumber, Phytophthora cinnamomi-lupin and Rhizoctonia solani-carrot”
e3“Suppressiveness against one disease was not well correlated with that against the other diseases”
Claim · model-written summary
CO2 production, a measure of general microbial activity, was the parameter most strongly correlated with the level of disease suppression.
- Taxon
- cucumberCucumis sativuse1
- Outcome
- most strongly correlated with the level of disease suppressione4
- Qualifier
- CO2 production, a measure of general microbial activitye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pythium ultimum-cucumber, Phytophthora cinnamomi-lupin and Rhizoctonia solani-carrot”
e4“The CO2 production, a measure of general microbial activity, was the parameter most strongly correlated with the level of disease suppression”
Claim · model-written summary
Wetsieving the biowaste before composting increased organic matter of the compost 2.4-fold.
- Treatment
- Wetsieving the biowaste with tap water over a 4-mm sieve prior to compostinge5
- Outcome
- organic mattere5
- Direction
- increasee5
- Value
- 2.4-folde5
Not reportedTaxonComparator
Verbatim
e5“Wetsieving the biowaste with tap water over a 4-mm sieve prior to composting yielded a compost with an 2.4-fold increase in organic matter”
Claim · model-written summary
Wetsieving the biowaste before composting decreased EC and Cl- concentration of the compost twofold.
- Treatment
- Wetsieving the biowaste with tap water over a 4-mm sieve prior to compostinge5
- Outcome
- EC and Cl--concentratione6
- Direction
- decreasee6
- Value
- twofolde6
Not reportedTaxonComparator
Verbatim
e5“Wetsieving the biowaste with tap water over a 4-mm sieve prior to composting yielded a compost with an 2.4-fold increase in organic matter”
e6“a twofold decrease in EC and Cl--concentration of the compost”
Claim · model-written summary
A linear relation was found between the amount of compost added to the potting mix and the level of disease suppression.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- amount of compost added to the potting mixe7
- Outcome
- level of disease suppressione7
- Direction
- linear relatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pythium ultimum-cucumber, Phytophthora cinnamomi-lupin and Rhizoctonia solani-carrot”
e7“A linear relation was found between the amount of compost added to the potting mix and the level of disease suppression”
The same questions in other papers
fertilization · control · Cucumis sativus (cucumber)Positive and negative results
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- negative
- no effect
- positive
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22 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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See all 24 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.