Abstract
Annual cool‐season legumes can contribute forage or green manure to warm‐season grass pastures or biofuel crops but may interfere with subsequent grass development. Arrowleaf clover ( Trifolium vesiculosum Savi cv. Yuchi), common vetch ( Vicia sativa L.), and button medic [ Medicago orbicularis (L.) Bartal cv. Estes] were oversown on 10‐yr‐old switchgrass ( Panicum virgatum L.) in north‐central Texas to evaluate dry matter (DM) yield and nutritive value. Legumes were no‐till drilled into a Windthorst fine sandy loam in autumn of 2000 and 2001; plots either received no dairy manure compost or 30 Mg compost ha −1 Forage was harvested when individual legume species reached flowering, when switchgrass regrowth reached boot stage, and at the end of the summer growing season. Switchgrass DM yields (3022–6630 kg ha −1 yr −1 ) were not reduced by overseeded legumes. Arrowleaf clover had the greatest production among the legume species and yielded more in a monoculture (1762–1923 kg ha −1 yr −1 ) than with switchgrass (757–814 kg). Cumulative yields increased the second year as a result of legumes, compost, and combinations of the two. Compost increased phosphorus concentrations in both the grass and legumes, but not crude protein or acid detergent fiber concentrations. Cool‐season annual legumes may be beneficial in switchgrass forage and biofuel systems, especially in combination with manure compost.
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Claims 10
Claim · model-written summary
Overseeded legumes did not reduce switchgrass dry-matter yield.
- Taxon
- Switchgrass
Panicum virgatume0 - Treatment
- overseeded legumese0
- Outcome
- DM yieldse0
- Direction
- not reducede0
- Value
- 3022–6630 kg ha −1 yr −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass DM yields (3022–6630 kg ha −1 yr −1 ) were not reduced by overseeded legumes”
Claim · model-written summary
Arrowleaf clover produced most among legumes.
Verbatim
e0“Arrowleaf clover had the greatest production among the legume species”
Claim · model-written summary
Arrowleaf clover yielded more as a monoculture than with switchgrass.
Verbatim
e0“yielded more in a monoculture (1762–1923 kg ha −1 yr −1 ) than with switchgrass (757–814 kg)”
t0“Arrowleaf clover had the greatest production”
Claim · model-written summary
Legumes increased second-year cumulative yield.
- Taxon
- switchgrassPanicum virgatumt0
- Treatment
- legumese0
- Outcome
- Cumulative yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cumulative yields increased the second year as a result of legumes, compost, and combinations of the two”
t0“Integration of Cool‐Season Annual Legumes and Dairy Manure Compost with Switchgrass”
Claim · model-written summary
Compost increased second-year cumulative yield.
- Taxon
- switchgrassPanicum virgatumt0
- Treatment
- composte0
- Outcome
- Cumulative yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cumulative yields increased the second year as a result of legumes, compost, and combinations of the two”
t0“Integration of Cool‐Season Annual Legumes and Dairy Manure Compost with Switchgrass”
Claim · model-written summary
The legume-compost combination increased second-year cumulative yield.
- Taxon
- switchgrassPanicum virgatumt0
- Treatment
- combinations of the twoe0
- Outcome
- Cumulative yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cumulative yields increased the second year as a result of legumes, compost, and combinations of the two”
t0“Integration of Cool‐Season Annual Legumes and Dairy Manure Compost with Switchgrass”
Claim · model-written summary
Compost increased phosphorus concentration in switchgrass.
- Taxon
- switchgrassPanicum virgatumt0
- Treatment
- Composte0
- Outcome
- phosphorus concentrationse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compost increased phosphorus concentrations in both the grass and legumes”
t0“Integration of Cool‐Season Annual Legumes and Dairy Manure Compost with Switchgrass”
Claim · model-written summary
Compost increased phosphorus concentration in legumes.
Not reportedComparator
Verbatim
e0“Compost increased phosphorus concentrations in both the grass and legumes”
Claim · model-written summary
Compost did not increase crude protein or acid detergent fiber concentrations.
- Taxon
- switchgrassPanicum virgatumt0
- Treatment
- Compostt0
- Outcome
- crude protein or acid detergent fiber concentrationse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not crude protein or acid detergent fiber concentrations”
t0“Integration of Cool‐Season Annual Legumes and Dairy Manure Compost with Switchgrass”
Claim · model-written summary
Authors suggest annual legumes benefit switchgrass forage and biofuel systems, especially with compost.
- Taxon
- switchgrassPanicum virgatume0
- Outcome
- may be beneficial in switchgrass forage and biofuel systemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cool‐season annual legumes may be beneficial in switchgrass forage and biofuel systems, especially in combination with manure compost”
t0“Integration of Cool‐Season Annual Legumes and Dairy Manure Compost with Switchgrass”
The same questions in other papers
fertilization · yield · Panicum virgatum (switchgrass)Results differ
29 papers in the same direction as this paper · 6 in the opposite direction
- positive
- no effect
- no effect
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See all 36 papers →fertilization · quality: protein · Panicum virgatum (switchgrass)Positive and negative results
2 in the opposite direction
- positive
- positive
fertilization · nutrient: content · Panicum virgatum (switchgrass)Results agree
9 papers in the same direction as this paper
- positive
- positive
- positive
6 papers more in this group
See all 10 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.