Abstract
Adapted warm season grasses have potential for both summer forage and biomass production in eastern Canada. A field study was conducted in 1995 and 1996 to determine the response of switchgrass ( Panicum virgatum L.) cv. Cave‐in‐Rock, Pathfinder, and Sunburst to nitrogen (N) fertilization at 0,75, or 150 kg ha −1 and three harvest schedules in a short season area. The grass was harvested at 4‐ or 6‐wk intervals or left uncut until the end of the season. These treatments were combined in a split‐plot design in each of three blocks on a St. Bernard sandy clay loam (Typic Hapludalf). Herbage yield and herbage N concentration were determined at each harvest for the cutting schedules. Herbage yields revealed a cultivar × N × harvest schedule interaction in 1996, while in 1995 only the two‐way interactions between cultivar × harvest schedule and N × harvest schedule were evident (P < 0.05). Total yield ranking for the harvest regimes was uncut > 6‐wk > 4‐wk with their respective mean yields being 11,10, and 8 Mg ha −1 for Cave‐in‐Rock; 10,8, and 6 Mg ha −1 for Pathfinder and 11,8, and 7 Mg ha −1 for Sunburst. Nitrogen concentrations increased with fertilization and varied with harvest and year, but not with cultivar. Mean N concentrations were 12.4, 13.9, and 15.4 g kg −1 dry matter (DM) for the 0, 75, and 150 kg ha −1 N levels, respectively, under the 4‐wk system. Corresponding values were 10.1, 11.6, and 12.9 g kg −1 for the 6‐wk system. End of season N concentrations for the uncut regime averaged 5.4, 6.0, and 7.6 g kg −1 DM in increasing order of N fertilization. The results indicate that switchgrass has potential in both grazed or hay forage systems in eastern Canada.
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Claims 10
Claim · model-written summary
Herbage yield had a cultivar by nitrogen by harvest-schedule interaction in 1996.
Not reportedDirection
Verbatim
e0“Herbage yields revealed a cultivar × N × harvest schedule interaction in 1996”
Claim · model-written summary
In 1995, herbage yield showed cultivar by schedule and nitrogen by schedule interactions.
- Taxon
- Switchgrass
Panicum virgatumt0 - Treatment
- N × harvest schedulee0
- Outcome
- interactions between cultivar × harvest schedule and N × harvest schedulee0
- Qualifier
- P < 0.05e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 1995 only the two‐way interactions between cultivar × harvest schedule and N × harvest schedule were evident (P < 0.05)”
t0“Switchgrass”
Claim · model-written summary
Cave-in-Rock total yield ranked uncut above 6-week above 4-week harvest, at 11, 10 and 8 Mg ha−1.
- Taxon
- SwitchgrassPanicum virgatumt0
- Material
- Cave‐in‐Rocke0
- Treatment
- uncute0
- Outcome
- mean yieldse0
- Direction
- uncut > 6‐wk > 4‐wke0
- Value
- 11,10, and 8 Mg ha −1e0
- Comparator
- 6‐wk > 4‐wke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“uncut > 6‐wk > 4‐wk with their respective mean yields being 11,10, and 8 Mg ha −1 for Cave‐in‐Rock”
t0“Switchgrass”
Claim · model-written summary
Pathfinder total yield ranked uncut above 6-week above 4-week harvest, at 10, 8 and 6 Mg ha−1.
- Taxon
- SwitchgrassPanicum virgatumt0
- Material
- Pathfindere0
- Treatment
- uncute0
- Outcome
- mean yieldse0
- Direction
- uncut > 6‐wk > 4‐wke0
- Value
- 10,8, and 6 Mg ha −1e0
- Comparator
- 6‐wk > 4‐wke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“uncut > 6‐wk > 4‐wk with their respective mean yields being 11,10, and 8 Mg ha −1 for Cave‐in‐Rock; 10,8, and 6 Mg ha −1 for Pathfinder”
t0“Switchgrass”
Claim · model-written summary
Sunburst total yield ranked uncut above 6-week above 4-week harvest, at 11, 8 and 7 Mg ha−1.
- Taxon
- SwitchgrassPanicum virgatumt0
- Material
- Sunburste0
- Treatment
- uncute0
- Outcome
- mean yieldse0
- Direction
- uncut > 6‐wk > 4‐wke0
- Value
- 11,8, and 7 Mg ha −1e0
- Comparator
- 6‐wk > 4‐wke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“uncut > 6‐wk > 4‐wk with their respective mean yields being 11,10, and 8 Mg ha −1 for Cave‐in‐Rock; 10,8, and 6 Mg ha −1 for Pathfinder and 11,8, and 7 Mg ha −1 for Sunburst”
t0“Switchgrass”
Claim · model-written summary
Herbage nitrogen concentration increased with fertilization and varied by harvest and year, but not cultivar.
- Taxon
- SwitchgrassPanicum virgatumt0
- Treatment
- fertilizatione0
- Outcome
- Nitrogen concentrationse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen concentrations increased with fertilization and varied with harvest and year, but not with cultivar”
t0“Switchgrass”
Claim · model-written summary
Under 4-week cutting, nitrogen concentration rose from 12.4 to 13.9 to 15.4 g kg−1 DM across increasing nitrogen doses.
- Taxon
- SwitchgrassPanicum virgatumt0
- Treatment
- 150 kg ha −1 Ne0
- Outcome
- Mean N concentrationse0
- Direction
- higherinferrede0
- Value
- 12.4, 13.9, and 15.4 g kg −1 dry matter (DM)e0
- Qualifier
- 4‐wk systeme0
- Comparator
- 0, 75e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mean N concentrations were 12.4, 13.9, and 15.4 g kg −1 dry matter (DM) for the 0, 75, and 150 kg ha −1 N levels, respectively, under the 4‐wk system”
t0“Switchgrass”
Claim · model-written summary
Under 6-week cutting, nitrogen concentration rose from 10.1 to 11.6 to 12.9 g kg−1 across increasing nitrogen doses.
- Taxon
- SwitchgrassPanicum virgatumt0
- Treatment
- 6‐wk systeme0
- Outcome
- Corresponding valuese0
- Direction
- higherinferrede0
- Value
- 10.1, 11.6, and 12.9 g kg −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corresponding values were 10.1, 11.6, and 12.9 g kg −1 for the 6‐wk system”
t0“Switchgrass”
Claim · model-written summary
At season end without cutting, nitrogen concentrations rose from 5.4 to 6.0 to 7.6 g kg−1 DM across increasing fertilizer doses.
- Taxon
- SwitchgrassPanicum virgatumt0
- Treatment
- N fertilizatione0
- Outcome
- End of season N concentrationse0
- Direction
- higherinferrede0
- Value
- 5.4, 6.0, and 7.6 g kg −1 DMe0
- Qualifier
- uncut regimee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“End of season N concentrations for the uncut regime averaged 5.4, 6.0, and 7.6 g kg −1 DM in increasing order of N fertilization”
t0“Switchgrass”
Claim · model-written summary
The authors conclude switchgrass can serve grazed or hay forage systems in eastern Canada.
- Taxon
- switchgrassPanicum virgatume0
- Outcome
- grazed or hay forage systemse0
- Setting
- eastern Canadae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“switchgrass has potential in both grazed or hay forage systems in eastern Canada”
The same questions in other papers
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.