Abstract
ABSTRACT Cassava (Manihot esculenta Crantz) is a highly mycotrophic crop, and prior soil cover may affect the density of arbuscular mycorrhizal fungi (AMFs), as well as the composition of the AMFs community in the soil. The aim of this study was to evaluate the occurrence and the structure of AMFs communities in cassava grown after different cover crops, and the effect of the cover crop on mineral nutrition and cassava yield under an organic farming system. The occurrence and structure of the AMFs community was evaluated through polymerase chain reaction (PCR) and denaturing gradient gel electrophoresis (DGGE). A randomized block experimental design was used with four replications. Six different cover crop management systems before cassava were evaluated: black oats, vetch, oilseed radish, intercropped oats + vetch, intercropped oats + vetch + oilseed radish, plus a control (fallow) treatment mowed every 15 days. Oats as a single crop or oats intercropped with vetch or with oilseed radish increased AMFs inoculum potential in soil with a low number of propagules, thus benefiting mycorrhizal colonization of cassava root. The treatments did not affect the structure of AMFs communities in the soil since the AMFs communities were similar in cassava roots in succession to different cover crops. AMFs colonization was high despite high P availability in the soil. The cassava crop yield was above the regional average, and P levels in the leaves were adequate, regardless of which cover crop treatments were used. One cover crop cycle prior to the cassava crop was not enough to observe a significant response in variables, P in plant tissue, crop yield, and occurrence and structure of AMFs communities in the soil. In the cassava roots in succession, the plant developmental stage affected the groupings of the structure of the AMF community.
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Claims 7
Claim · model-written summary
Oats and oat mixtures increased soil AMF inoculum potential and benefited cassava root colonization.
- Taxon
- Cassava
Manihot esculentat0 - Treatment
- Oats as a single crop or oats intercropped with vetch or with oilseed radishe0
- Interactor
- AMFse0symbiont
- Outcome
- AMFs inoculum potentiale0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“Oats as a single crop or oats intercropped with vetch or with oilseed radish increased AMFs inoculum potential in soil with a low number of propagules, thus benefiting mycorrhizal colonization of cassava root”
Claim · model-written summary
Cover-crop treatments did not affect soil AMF community structure.
- Taxon
- CassavaManihot esculentat0
- Treatment
- different cover cropse0
- Interactor
- AMFse0symbiont
- Outcome
- structure of AMFs communities in the soile0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“The treatments did not affect the structure of AMFs communities in the soil since the AMFs communities were similar in cassava roots in succession to different cover crops”
Claim · model-written summary
AMF colonization was high despite high soil phosphorus availability.
- Taxon
- CassavaManihot esculentat0
- Interactor
- AMFse0symbiont
- Outcome
- AMFs colonizatione0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“AMFs colonization was high despite high P availability in the soil”
Claim · model-written summary
Cassava yield exceeded the regional average regardless of cover crop.
- Taxon
- CassavaManihot esculentat0
- Outcome
- cassava crop yielde0
- Direction
- abovee0
- Comparator
- regional averagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“The cassava crop yield was above the regional average, and P levels in the leaves were adequate, regardless of which cover crop treatments were used”
Claim · model-written summary
Leaf phosphorus levels were adequate across cover crop treatments.
- Taxon
- CassavaManihot esculentat0
- Outcome
- P levels in the leavese0
- Direction
- adequatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“P levels in the leaves were adequate, regardless of which cover crop treatments were used”
Claim · model-written summary
One cover-crop cycle produced no significant response in plant tissue phosphorus, crop yield or AMF occurrence and structure.
- Taxon
- CassavaManihot esculentat0
- Treatment
- One cover crop cyclee0
- Interactor
- AMFse0symbiont
- Outcome
- P in plant tissue, crop yield, and occurrence and structure of AMFs communities in the soile0
- Direction
- not enough to observe a significant responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“One cover crop cycle prior to the cassava crop was not enough to observe a significant response in variables, P in plant tissue, crop yield, and occurrence and structure of AMFs communities in the soil”
Claim · model-written summary
Cassava developmental stage affected AMF community structure groupings in roots.
- Taxon
- CassavaManihot esculentat0
- Organ / stage
- plant developmental stagee0
- Interactor
- AMFe0symbiont
- Outcome
- groupings of the structure of the AMF communitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“In the cassava roots in succession, the plant developmental stage affected the groupings of the structure of the AMF community”
The same questions in other papers
cover crop · yield · Manihot esculenta (cassava)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
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