Abstract
Abstract Continuous monocrop soybean [ Glycine max (L.) Merr.] production has been common in Louisiana for 20 yr. This field study was undertaken to determine if, and how, short‐term crop rotations could increase soybean yield on a Providence silt loam (fine‐silty, mixed, thermic Typic Fragiudalfs) in southeast Louisiana. Eight 2‐yr rotations were evaluated in a field following 15 yr of continuous soybean production. Rotations investigated were: continuous soybean; soybean rotated with grain sorghum ( Sorghum bicolor L.); soybean rotated with fallow; soybean doublecropped with winter wheat ( Triticum aestivum L.); soybean alternated with winter wheat underseeded with alfalfa ( Medicago sativa L.); and three additional rotations, identical to the first three listed with the addition of a winter ryegrass ( Lolium multiflorum L.) cover crop. Two soybean cultivars, Centennial and Davis, with different plant parasitic nematode susceptibility, were evaluated in each rotation. Over four complete rotation cycles, Centennial consistently out‐yielded Davis. Soybean grown after either grain sorghum or fallow consistently out‐yielded soybean grown following soybean. This difference existed during favorable and unfavorable growing seasons and was greater for Davis than for Centennial. Insect populations were not high at the study site and did not have a major impact on crop yields. Soybean cyst nematode ( Heterodera glycines Inchinohe) populations were higher under Davis than Centennial soybean, increased each year, and were greater with continuous soybean than with rotation. Control of cyst nematode populations appeared to be the main reason for the beneficial rotation effect observed in this study.
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Claims 9
Claim · model-written summary
Centennial consistently yielded more than Davis over four rotation cycles.
Verbatim
e0“Over four complete rotation cycles, Centennial consistently out‐yielded Davis.”
Claim · model-written summary
Soybean after grain sorghum yielded more than soybean after soybean.
- Taxon
- Soybean
Glycine maxe0 - Treatment
- grain sorghume0
- Outcome
- out‐yieldede0
- Direction
- out‐yieldede0
- Comparator
- soybean grown following soybeane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean grown after either grain sorghum or fallow consistently out‐yielded soybean grown following soybean.”
Claim · model-written summary
Soybean after fallow yielded more than soybean after soybean.
- Taxon
- SoybeanGlycine maxe0
- Treatment
- fallowe0
- Outcome
- out‐yieldede0
- Direction
- out‐yieldede0
- Comparator
- soybean grown following soybeane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean grown after either grain sorghum or fallow consistently out‐yielded soybean grown following soybean.”
Claim · model-written summary
The rotation yield advantage occurred in favorable and unfavorable seasons and was greater for Davis than Centennial.
- Taxon
- SoybeanGlycine maxt0
- Material
- Davise0
- Outcome
- differencee0
- Direction
- greatere0
- Qualifier
- favorable and unfavorable growing seasonse0
- Comparator
- Centenniale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This difference existed during favorable and unfavorable growing seasons and was greater for Davis than for Centennial.”
t0“Soybean Production”
Claim · model-written summary
Insect populations were low and did not substantially affect yields.
Verbatim
e0“Insect populations were not high at the study site and did not have a major impact on crop yields.”
Claim · model-written summary
Soybean cyst nematode populations were higher under Davis than Centennial.
- Taxon
- soybeanGlycine maxe0
- Material
- Davise0
- Interactor
- Heterodera glycines Inchinohe
Heterodera glycinese0pathogen - Outcome
- Soybean cyst nematode ( Heterodera glycines Inchinohe) populationse0
- Direction
- highere0
- Comparator
- Centennial soybeane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean cyst nematode ( Heterodera glycines Inchinohe) populations were higher under Davis than Centennial soybean, increased each year, and were greater with continuous soybean than with rotation.”
Claim · model-written summary
Soybean cyst nematode populations increased each year.
- Taxon
- soybeanGlycine maxe0
- Interactor
- Heterodera glycines InchinoheHeterodera glycinese0pathogen
- Outcome
- Soybean cyst nematode ( Heterodera glycines Inchinohe) populationse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean cyst nematode ( Heterodera glycines Inchinohe) populations were higher under Davis than Centennial soybean, increased each year, and were greater with continuous soybean than with rotation.”
Claim · model-written summary
Soybean cyst nematode populations were greater with continuous soybean than rotation.
- Taxon
- soybeanGlycine maxe0
- Treatment
- continuous soybeane0
- Interactor
- Heterodera glycines InchinoheHeterodera glycinese0pathogen
- Outcome
- Soybean cyst nematode ( Heterodera glycines Inchinohe) populationse0
- Direction
- greatere0
- Comparator
- rotatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean cyst nematode ( Heterodera glycines Inchinohe) populations were higher under Davis than Centennial soybean, increased each year, and were greater with continuous soybean than with rotation.”
Claim · model-written summary
Cyst nematode control appeared to account for the rotation benefit.
- Taxon
- SoybeanGlycine maxt0
- Interactor
- cyst nematodee0pathogen
- Outcome
- beneficial rotation effecte0
- Qualifier
- appeared to be the main reasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Control of cyst nematode populations appeared to be the main reason for the beneficial rotation effect observed in this study.”
t0“Soybean Production”
The same questions in other papers
rotation · Heterodera glycines · Glycine max (soybean)Positive and negative results
3 papers in the same direction as this paper · 13 in the opposite direction
- positive
- positive
- 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.