Abstract
Soybean [ Glycine max (L.) Merr.] generally yields more when rotated with another crop rather than grown continuously. The specific reasons for this yield response are unknown. The objective of this study was to investigate the extent to which a soybean‐corn ( Zea mays L.) rotation limited the buildup of host‐specific pathogens of soybean, and to evaluate whether plant diseases were involved in the rotation effect. Incidence and severity of seven diseases and seed yield were recorded at two locations in the field in 1987 and 1988 for soybean maintained in four cropping sequences ranging from annual alternation with corn to 1,2, or 5 yr of continuous cropping. Brown stem rot (BSR) caused by the fungus Phialophora gregata (Allington & D.W. Chamberlain) W. Gains was found to be the most prevalent disease during both years and at both locations. Rhizoctonia root rot ( Rhizoctonia solani Kühn) and stem canker ( Diaporthe phaseolorum Cooke. & Ellis Sacc. var. Cavlivora Athow & Caldwell) were noted in 1987 at both locations among <5% of all plants monitored. The BSR‐prevalence ratings were relatively high (mean 60%) for Hodgson 78, a susceptible cultivar, and relatively low (mean 22%) for BSR101, a resistant cultivar. Seed yield data from the various cropping sequences for the two cultivars indicated no clear relationship between BSR severity and seed yield. In 1987, rotation with corn resulted in a yield benefit to both cultivars. In 1988, both yield and development of BSR were adversely affected by drought. A comparison of the seed yield of severely infected and uninfected plants within cropping sequence indicated that BSR had a minimal effect on soybean yield in 1988. Therefore, within the conditions of this study, the yield benefit to soybean from rotation with corn did not appear to be due to the reduced incidence of plant diseases.
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Claims 9
Claim · model-written summary
Brown stem rot caused by Phialophora gregata was the most prevalent soybean disease in both years and at both locations.
- Taxon
- Glycine max
Glycine maxe0 - Interactor
- Phialophora gregataCadophora gregatae1pathogen
- Outcome
- most prevalent diseasee1
- Setting
- two locations in the fielde2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean [ Glycine max (L.) Merr.]”
e1“Brown stem rot (BSR) caused by the fungus Phialophora gregata (Allington & D.W. Chamberlain) W. Gains was found to be the most prevalent disease during both years and at both locations”
e2“Incidence and severity of seven diseases and seed yield were recorded at two locations in the field in 1987 and 1988”
Claim · model-written summary
Brown stem rot prevalence ratings were relatively high (mean 60%) for the susceptible cultivar Hodgson 78.
- Taxon
- Glycine maxGlycine maxe0
- Material
- Hodgson 78e3
- Outcome
- prevalence ratingse3
- Value
- mean 60%e3
- Qualifier
- susceptible cultivare3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean [ Glycine max (L.) Merr.]”
e3“The BSR‐prevalence ratings were relatively high (mean 60%) for Hodgson 78, a susceptible cultivar, and relatively low (mean 22%) for BSR101, a resistant cultivar”
Claim · model-written summary
Brown stem rot prevalence ratings were relatively low (mean 22%) for the resistant cultivar BSR101.
- Taxon
- Glycine maxGlycine maxe0
- Material
- BSR101e3
- Outcome
- prevalence ratingse3
- Value
- mean 22%e3
- Qualifier
- resistant cultivare3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean [ Glycine max (L.) Merr.]”
e3“The BSR‐prevalence ratings were relatively high (mean 60%) for Hodgson 78, a susceptible cultivar, and relatively low (mean 22%) for BSR101, a resistant cultivar”
Claim · model-written summary
Rhizoctonia root rot and stem canker were noted among under 5% of soybean plants monitored in 1987 at both locations.
- Taxon
- Glycine maxGlycine maxe0
- Interactor
- Rhizoctonia solani
Rhizoctonia solanie4pathogen - Second interactor
- Diaporthe phaseolorum
Diaporthe phaseolorume4pathogen - Outcome
- Incidencee2
- Value
- <5%e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean [ Glycine max (L.) Merr.]”
e2“Incidence and severity of seven diseases and seed yield were recorded at two locations in the field in 1987 and 1988”
e4“Rhizoctonia root rot ( Rhizoctonia solani Kühn) and stem canker ( Diaporthe phaseolorum Cooke. & Ellis Sacc. var. Cavlivora Athow & Caldwell) were noted in 1987 at both locations among <5% of all plants monitored”
Claim · model-written summary
Across the cropping sequences, seed yield showed no clear relationship with brown stem rot severity in the two cultivars.
- Taxon
- Glycine maxGlycine maxe0
- Interactor
- BSRe5pathogen
- Outcome
- seed yielde5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean [ Glycine max (L.) Merr.]”
e5“Seed yield data from the various cropping sequences for the two cultivars indicated no clear relationship between BSR severity and seed yield”
Claim · model-written summary
In 1987, rotation with corn gave soybean a yield benefit in both cultivars compared with continuous cropping.
- Taxon
- Glycine maxGlycine maxe0
- Treatment
- rotation with corne6
- Outcome
- yielde6
- Direction
- benefite6
- Comparator
- continuous croppinge7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean [ Glycine max (L.) Merr.]”
e6“In 1987, rotation with corn resulted in a yield benefit to both cultivars”
e7“ranging from annual alternation with corn to 1,2, or 5 yr of continuous cropping”
Claim · model-written summary
In 1988, drought adversely affected both soybean yield and brown stem rot development.
- Taxon
- Glycine maxGlycine maxe0
- Treatment
- droughte7
- Outcome
- yield and development of BSRe7
- Direction
- adversely affectede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean [ Glycine max (L.) Merr.]”
e7“In 1988, both yield and development of BSR were adversely affected by drought”
Claim · model-written summary
Brown stem rot had a minimal effect on soybean yield in 1988 when severely infected and uninfected plants were compared within cropping sequences.
- Taxon
- Glycine maxGlycine maxe0
- Treatment
- severely infectede7
- Interactor
- BSRe7pathogen
- Outcome
- soybean yielde7
- Qualifier
- minimal effecte7
- Comparator
- uninfected plantse7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean [ Glycine max (L.) Merr.]”
e7“A comparison of the seed yield of severely infected and uninfected plants within cropping sequence indicated that BSR had a minimal effect on soybean yield in 1988”
Claim · model-written summary
Within this study, the yield benefit of rotation with corn did not appear to be due to reduced plant disease incidence.
- Taxon
- Glycine maxGlycine maxe0
- Treatment
- rotation with corne7
- Outcome
- yield benefite7
- Qualifier
- within the conditions of this studye7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean [ Glycine max (L.) Merr.]”
e7“Therefore, within the conditions of this study, the yield benefit to soybean from rotation with corn did not appear to be due to the reduced incidence of plant diseases”
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See all 144 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.