Abstract
Two field experiments were conducted in central Iowa to assess the effects of tillage on Heterodera glycines dissemination and reproduction and soybean (Glycine max) yield. Plots in both experiments were artificially infested with equivalent numbers of H. glycines cysts. In one experiment, plots were left noninfested or received aggregated or uniform infestation, and a susceptible soybean cultivar was grown for 3 years. By the end of the first growing season and through the second, H. glycines population densities were consistently greater (P ≤ 0.05) in uniformly infested plots than in plots with aggregated infestations. No differences in soybean yield among the treatments were detected. In a second experiment, a 1-m 2 area of each plot was infested with H. glycines cysts, susceptible soybeans were grown for four seasons, and crop residue was managed with either ridge-, conventional-, reduced-, or no-tillage. After 1 year, nematode population densities were significantly (P ≤ 0.05) greater in conventional- and reduced-tillage treatments than in no- and ridge-tillage treatments. After 2 years, H. glycines had been disseminated 6.9 m from the infestation site in conventional- and reduced-tillage treatments but only 0.5 and 1.4 m for no-tillage and ridge-tillage treatments, respectively. After 3 years, H. glycines population densities were 10 times greater in conventional- and reduced-tillage treatments than in the no-tillage treatment; conventional-tillage was the only treatment with yield significantly lower (P ≤ 0.05) than the noninfested control. Aggregation of H. glycines eggs was greater (P ≤ 0.05) in no- and ridge-tillage treatments than in conventional- and reduced-tillage treatments. Results indicate tillage can quickly disseminate H. glycines in newly infested fields, facilitating more rapid nematode reproduction and subsequent yield loss.
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Claims 9
Claim · model-written summary
Uniform infestation produced greater H. glycines densities than aggregated infestation through the second season.
- Taxon
- soybean
Glycine maxt0 - Treatment
- uniformly infested plotse0
- Interactor
- H. glycines
Heterodera glycinese0pathogen - Outcome
- H. glycines population densitiese0
- Direction
- greatere0
- Comparator
- plots with aggregated infestationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H. glycines population densities were consistently greater (P ≤ 0.05) in uniformly infested plots than in plots with aggregated infestations.”
t0“Soybean”
Claim · model-written summary
Soybean yield did not differ among infestation treatments.
- Taxon
- soybeanGlycine maxe0
- Treatment
- treatmentse0
- Outcome
- soybean yielde0
- Direction
- No differencese0
- Comparator
- treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No differences in soybean yield among the treatments were detected.”
Claim · model-written summary
After one year, nematode density was greater under conventional and reduced tillage than under no and ridge tillage.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- conventional- and reduced-tillage treatmentse0
- Interactor
- Heterodera glycinesHeterodera glycinest0pathogen
- Outcome
- nematode population densitiese0
- Direction
- greatere0
- Comparator
- no- and ridge-tillage treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 1 year, nematode population densities were significantly (P ≤ 0.05) greater in conventional- and reduced-tillage treatments than in no- and ridge-tillage treatments.”
t0“Effects of Tillage Practices on Dissemination and Spatial Patterns of Heterodera glycines and Soybean Yield”
Claim · model-written summary
After two years, H. glycines spread 6.9 m under conventional and reduced tillage.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- conventional- and reduced-tillage treatmentse0
- Interactor
- H. glycinesHeterodera glycinese0pathogen
- Outcome
- H. glycines had been disseminatede0
- Direction
- disseminatede0
- Value
- 6.9 me0
- Comparator
- no-tillage and ridge-tillage treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 2 years, H. glycines had been disseminated 6.9 m from the infestation site in conventional- and reduced-tillage treatments but only 0.5 and 1.4 m for no-tillage and ridge-tillage treatments, respectively.”
t0“Soybean”
Claim · model-written summary
After two years, H. glycines spread 0.5 m under no tillage.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- no-tillagee0
- Interactor
- H. glycinesHeterodera glycinese0pathogen
- Outcome
- H. glycines had been disseminatede0
- Direction
- onlye0
- Value
- 0.5e0
- Comparator
- conventional- and reduced-tillage treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 2 years, H. glycines had been disseminated 6.9 m from the infestation site in conventional- and reduced-tillage treatments but only 0.5 and 1.4 m for no-tillage and ridge-tillage treatments, respectively.”
t0“Soybean”
Claim · model-written summary
After two years, H. glycines spread 1.4 m under ridge tillage.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- ridge-tillage treatmentse0
- Interactor
- H. glycinesHeterodera glycinese0pathogen
- Outcome
- H. glycines had been disseminatede0
- Direction
- onlye0
- Value
- 1.4 me0
- Comparator
- conventional- and reduced-tillage treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 2 years, H. glycines had been disseminated 6.9 m from the infestation site in conventional- and reduced-tillage treatments but only 0.5 and 1.4 m for no-tillage and ridge-tillage treatments, respectively.”
t0“Soybean”
Claim · model-written summary
After three years, H. glycines density was tenfold greater under conventional and reduced tillage than no tillage.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- conventional- and reduced-tillage treatmentse0
- Interactor
- H. glycinesHeterodera glycinese0pathogen
- Outcome
- H. glycines population densitiese0
- Direction
- greatere0
- Value
- 10 timese0
- Comparator
- no-tillage treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 3 years, H. glycines population densities were 10 times greater in conventional- and reduced-tillage treatments than in the no-tillage treatment;”
t0“Soybean”
Claim · model-written summary
Conventional tillage reduced soybean yield relative to noninfested control.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- conventional-tillagee0
- Outcome
- yielde0
- Direction
- lowere0
- Comparator
- noninfested controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conventional-tillage was the only treatment with yield significantly lower (P ≤ 0.05) than the noninfested control.”
t0“Soybean”
Claim · model-written summary
H. glycines egg aggregation was greater under no and ridge tillage than conventional and reduced tillage.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- no- and ridge-tillage treatmentse0
- Interactor
- H. glycinesHeterodera glycinese0pathogen
- Outcome
- Aggregation of H. glycines eggse0
- Direction
- greatere0
- Comparator
- conventional- and reduced-tillage treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aggregation of H. glycines eggs was greater (P ≤ 0.05) in no- and ridge-tillage treatments than in conventional- and reduced-tillage treatments.”
t0“Soybean”
The same questions in other papers
infection · Heterodera glycines · Glycine max (soybean)Results differ
3 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
2 papers more in this group
See all 6 papers →tillage · Heterodera glycines · Glycine max (soybean)Positive and negative results
2 papers in the same direction as this paper · 6 in the opposite direction
- negative
- no effect
- no effect
5 papers more in this group
See all 9 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.