Abstract
An 11-year field study was initiated in 1979 to monitor population development of Heterodera glycines. Fifty cysts of a race 5 population were introduced into plots in a field with no history of soybean production and that had been in sod for 20 years. Soybean cultivars either susceptible or resistant to H. glycines were grown either in monoculture or rotated with maize in a 2-year rotation. During the first 5 years, resistant cultivars with the Peking source of resistance were planted. After year 5, monocuhure of Peking resistance resulted in 18 cysts/250 cm(3) of soil, whereas populations resulting from the continuous cropping of susceptible soybean resulted in 45 cysts/250 cm(3). Some plots in all treatments, including control plots, were contaminated at the end of year 5. Crop rotation delayed population development of H. glycines. During years 6 through 11 cv. Fayette (PI88.788 source of resistance) was planted. In year 6 numbers of cysts declined to 1/250 cm(3) of soil in the treatment consisting of monocultured Fayette. At the end of year 10, cysts were below the detection level in all treatments in which Fayette was planted. Yield of susceptible soybean in monoculture with or without H. glycines infestation was lower beginning in year 6 when compared to yield of soybean grown in rotation and remained lower throughout the duration of the experiment except for 1987 (year 9). Yields of susceptible and resistant soybean were different each year except for drought years in 1980 and 1988. From 1979 to 1982 differences in yield were due to lower yield potential of resistant cultivars. Except for the drought year, yield of cv. Fayette was greater than susceptible Williams 82 during years 6 through 11.
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Claims 10
Claim · model-written summary
After five years, Peking resistance monoculture had 18 cysts per 250 cubic centimeters of soil.
- Taxon
- Soybean
Glycine maxt0 - Material
- Peking resistancee0
- Interactor
- Heterodera glycines
Heterodera glycinest1pathogen - Outcome
- cystse0
- Value
- 18 cysts/250 cm(3) of soile0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After year 5, monocuhure of Peking resistance resulted in 18 cysts/250 cm(3) of soil”
t0“Soybean Yield”
t1“Heterodera glycines”
Claim · model-written summary
Continuous susceptible soybean cropping had 45 cysts per 250 cubic centimeters of soil after five years.
- Taxon
- soybeanGlycine maxe0
- Material
- susceptible soybeane0
- Interactor
- Heterodera glycinesHeterodera glycinest1pathogen
- Outcome
- populationse0
- Value
- 45 cysts/250 cm(3)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“populations resulting from the continuous cropping of susceptible soybean resulted in 45 cysts/250 cm(3)”
t1“Heterodera glycines”
Claim · model-written summary
Some plots in every treatment, including controls, were contaminated by year five.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- contaminatede0
- Qualifier
- at the end of year 5e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some plots in all treatments, including control plots, were contaminated at the end of year 5.”
t0“Soybean Yield”
Claim · model-written summary
Crop rotation delayed Heterodera glycines population development.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Crop rotatione0
- Interactor
- Heterodera glycinesHeterodera glycinest1pathogen
- Outcome
- population development of H. glycinese0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop rotation delayed population development of H. glycines.”
t0“Soybean Yield”
t1“Heterodera glycines”
Claim · model-written summary
In year six, cyst numbers declined to 1 per 250 cubic centimeters of soil under Fayette monoculture.
- Taxon
- SoybeanGlycine maxt0
- Material
- Fayettee0
- Interactor
- Heterodera glycinesHeterodera glycinest1pathogen
- Outcome
- numbers of cystse0
- Direction
- declinede0
- Value
- 1/250 cm(3) of soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In year 6 numbers of cysts declined to 1/250 cm(3) of soil in the treatment consisting of monocultured Fayette.”
t0“Soybean Yield”
t1“Heterodera glycines”
Claim · model-written summary
By year ten, cysts were below detection in all treatments planted with Fayette.
- Taxon
- SoybeanGlycine maxt0
- Material
- Fayettee0
- Interactor
- Heterodera glycinesHeterodera glycinest1pathogen
- Outcome
- cysts were below the detection levele0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the end of year 10, cysts were below the detection level in all treatments in which Fayette was planted.”
t0“Soybean Yield”
t1“Heterodera glycines”
Claim · model-written summary
Susceptible soybean in monoculture yielded less than soybean in rotation from year six onward, except in 1987, regardless of nematode infestation.
- Taxon
- soybeanGlycine maxe0
- Material
- susceptible soybeane0
- Interactor
- Heterodera glycinesHeterodera glycinest1pathogen
- Outcome
- Yielde0
- Direction
- lowere0
- Qualifier
- except for 1987 (year 9)e0
- Comparator
- soybean grown in rotatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of susceptible soybean in monoculture with or without H. glycines infestation was lower beginning in year 6 when compared to yield of soybean grown in rotation and remained lower throughout the duration of the experiment except for 1987 (year 9).”
t1“Heterodera glycines”
Claim · model-written summary
Susceptible and resistant soybean yields differed each year except the drought years 1980 and 1988.
- Taxon
- soybeanGlycine maxe0
- Material
- susceptible and resistant soybeane0
- Outcome
- Yieldse0
- Direction
- differente0
- Qualifier
- except for drought years in 1980 and 1988e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of susceptible and resistant soybean were different each year except for drought years in 1980 and 1988.”
Claim · model-written summary
From 1979 to 1982, resistant cultivars had lower yield potential.
- Taxon
- SoybeanGlycine maxt0
- Material
- resistant cultivarse0
- Outcome
- yield potentiale0
- Direction
- lowere0
- Qualifier
- From 1979 to 1982e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“From 1979 to 1982 differences in yield were due to lower yield potential of resistant cultivars.”
t0“Soybean Yield”
Claim · model-written summary
Except in a drought year, Fayette yielded more than Williams 82 during years six through eleven.
- Taxon
- SoybeanGlycine maxt0
- Material
- cv. Fayettee0
- Outcome
- yielde0
- Direction
- greatere0
- Qualifier
- Except for the drought yeare0
- Comparator
- susceptible Williams 82e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except for the drought year, yield of cv. Fayette was greater than susceptible Williams 82 during years 6 through 11.”
t0“Soybean Yield”
The same questions in other papers
rotation · Heterodera glycines · Glycine max (soybean)Positive and negative results
12 papers in the same direction as this paper · 4 in the opposite direction
- negative
- no effect
- positive
13 papers more in this group
See all 17 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.