Abstract
Abstract The objective of the present study was to evaluate the natural suppressive capacity of soils from forest, and monocropping and intercropping systems, against root rot, caused by Scytalidium lignicola , in a greenhouse experiment. We used soils from a tropical dry forest (FOR) and two intercropping and two monoculture systems. The first intercrop was maize and beans (CORNCOWP), and the second intercrop was cassava, pigeon peas and beans (CASPIGPCOWP). The first monoculture was beans, and the second was passion fruit . The intercropping soils showed a higher capacity to suppress black root rot in cassava than the monoculture because such soils were able to reduce disease severity by about 50%. Bean soil in the monoculture showed less microbial biomass carbon than in the intercrop, with means of 10.05 and 38.2 mg/kg, respectively. The higher density of bacteria and fungal populations, microbial biomass, urease and arylsulphatase activities correlated with a decrease in disease severity. Soils from the intercrops produced changes in soil quality, primarily in the population and density of microorganisms, enzymatic activities, total organic carbon and nutrients, reducing disease severity in cassava plants. These effects were validated by multivariate principal component analysis and showed three distinct groups: one FOR, one intercropping and one monocropping. The majority of vectors were in the direction of FOR and intercropping soils. We have provided some of the first data related to the beneficial effects of intercropping on the suppression of black root rot in cassava, which is validated through different attributes.
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Claims 5
Claim · model-written summary
Soils from intercropping reduced cassava black root rot severity by about 50% compared with monoculture soils.
- Taxon
- cassava
Manihot esculentat0 - Treatment
- intercropping soilse1
- Interactor
- Scytalidium lignicolaScytalidium lignicolae0pathogen
- Outcome
- disease severitye1
- Direction
- reducee1
- Value
- about 50%e1
- Comparator
- monoculturee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“black root rot in cassava”
e0“root rot, caused by Scytalidium lignicola”
e1“The intercropping soils showed a higher capacity to suppress black root rot in cassava than the monoculture because such soils were able to reduce disease severity by about 50%”
Claim · model-written summary
Bean monoculture soil had less microbial biomass carbon than intercrop soil, at 10.05 versus 38.2 mg/kg.
- Taxon
- cassavaManihot esculentat0
- Treatment
- Bean soil in the monoculturee2
- Outcome
- microbial biomass carbone2
- Direction
- lesse2
- Value
- 10.05 and 38.2 mg/kge2
- Comparator
- intercrope2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“black root rot in cassava”
e2“Bean soil in the monoculture showed less microbial biomass carbon than in the intercrop, with means of 10.05 and 38.2 mg/kg”
Claim · model-written summary
Higher densities of bacteria and fungi, microbial biomass, urease and arylsulphatase activities correlated with lower cassava root rot severity.
- Taxon
- cassavaManihot esculentat0
- Treatment
- higher density of bacteria and fungal populationse3
- Outcome
- disease severitye3
- Direction
- decreasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“black root rot in cassava”
e3“The higher density of bacteria and fungal populations, microbial biomass, urease and arylsulphatase activities correlated with a decrease in disease severity”
Claim · model-written summary
Intercrop soils changed soil quality, mainly in the population and density of microorganisms.
- Taxon
- cassavaManihot esculentat0
- Treatment
- Soils from the intercropse4
- Outcome
- changes in soil qualitye4
- Qualifier
- primarily in the population and density of microorganismse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“black root rot in cassava”
e4“Soils from the intercrops produced changes in soil quality, primarily in the population and density of microorganisms”
Claim · model-written summary
Multivariate principal component analysis separated the soils into three distinct groups: forest, intercropping and monocropping.
- Taxon
- cassavaManihot esculentat0
- Outcome
- three distinct groupse5
- Qualifier
- multivariate principal component analysise5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“black root rot in cassava”
e5“These effects were validated by multivariate principal component analysis and showed three distinct groups: one FOR, one intercropping and one monocropping”