Abstract
ABSTRACT Switchgrass ( Panicum virgatum L.) has potential for both bioenergy and forage. The objectives of this experiment were to (i) determine whether switchgrass could be harvested for greater nutritive value during the vegetative stage relative to early reproductive growth (boot stage); (ii) compare biomass yields of switchgrass harvested once vs. twice per year for bioenergy; and (iii) examine effects of N fertilizer rates on harvest systems. The experiment was a randomized complete block design with a split‐plot arrangement of harvest system treatments as main plot (harvest once per year after frost, harvest twice per year first at vegetative or boot stage, and regrowth after frost) and N fertilizer rate as subplots (0, 90, 180, and 270 kg N ha −1 ). Biomass yield was greatest and nutrient concentrations were least in the one‐cut system. For the two‐cut system, nutritive values and yields were similar. Total annual biomass increased linearly with N fertilization. Across N rates, crude protein (CP) concentration for the two‐cut systems was 50% greater (71 g kg −1 ) and acid detergent fiber (ADF) and neutral detergent fiber (NDF) concentrations were 20% lesser (465 and 856 g kg −1 , respectively) than switchgrass in the one‐cut system. –Switchgrass harvested at vegetative through boot stage and its regrowth could provide forage of acceptable nutritive value to beef cows. However, greater nutrient removal requires appropriate soil fertility evaluation and fertilizer management for sustainable yields.
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Claims 9
Claim · model-written summary
Biomass yield was greatest in the one-cut system.
- Taxon
- Switchgrass
Panicum virgatume1 - Treatment
- one‐cut systeme0
- Outcome
- Biomass yielde0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Biomass yield was greatest and nutrient concentrations were least in the one‐cut system”
e1“Switchgrass ( Panicum virgatum L.) has potential for both bioenergy and forage”
Claim · model-written summary
Nutrient concentrations were least in the one-cut system.
- Taxon
- SwitchgrassPanicum virgatume1
- Treatment
- one‐cut systeme0
- Outcome
- nutrient concentrationse0
- Direction
- leaste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Biomass yield was greatest and nutrient concentrations were least in the one‐cut system”
e1“Switchgrass ( Panicum virgatum L.) has potential for both bioenergy and forage”
Claim · model-written summary
For the two-cut system, nutritive values and yields were similar.
- Taxon
- SwitchgrassPanicum virgatume1
- Treatment
- two‐cut systeme2
- Outcome
- nutritive values and yieldse2
- Direction
- similare2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“For the two‐cut system, nutritive values and yields were similar”
e1“Switchgrass ( Panicum virgatum L.) has potential for both bioenergy and forage”
Claim · model-written summary
Total annual biomass increased linearly with N fertilization.
- Taxon
- SwitchgrassPanicum virgatume1
- Treatment
- N fertilizatione3
- Outcome
- Total annual biomasse3
- Direction
- increased linearlye3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Total annual biomass increased linearly with N fertilization”
e1“Switchgrass ( Panicum virgatum L.) has potential for both bioenergy and forage”
Claim · model-written summary
Across N rates, crude protein concentration was 50% greater in the two-cut systems than in the one-cut system.
- Taxon
- SwitchgrassPanicum virgatume1
- Treatment
- two‐cut systemse0
- Outcome
- crude protein (CP) concentratione0
- Direction
- greatere0
- Value
- 50%e0
- Qualifier
- 71 g kg −1e0
- Comparator
- one‐cut systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across N rates, crude protein (CP) concentration for the two‐cut systems was 50% greater (71 g kg −1 ) and acid detergent fiber (ADF) and neutral detergent fiber (NDF) concentrations were 20% lesser (465 and 856 g kg −1 , respectively) than switchgrass in the one‐cut system”
e1“Switchgrass ( Panicum virgatum L.) has potential for both bioenergy and forage”
Claim · model-written summary
Acid detergent fiber concentration was 20% lower in the two-cut systems than in the one-cut system.
- Taxon
- SwitchgrassPanicum virgatume1
- Treatment
- two‐cut systemse0
- Outcome
- acid detergent fiber (ADF)e0
- Direction
- lessere0
- Value
- 20%e0
- Qualifier
- 465e0
- Comparator
- one‐cut systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across N rates, crude protein (CP) concentration for the two‐cut systems was 50% greater (71 g kg −1 ) and acid detergent fiber (ADF) and neutral detergent fiber (NDF) concentrations were 20% lesser (465 and 856 g kg −1 , respectively) than switchgrass in the one‐cut system”
e1“Switchgrass ( Panicum virgatum L.) has potential for both bioenergy and forage”
Claim · model-written summary
Neutral detergent fiber concentration was 20% lower in the two-cut systems than in the one-cut system.
- Taxon
- SwitchgrassPanicum virgatume1
- Treatment
- two‐cut systemse0
- Outcome
- neutral detergent fiber (NDF)e0
- Direction
- lessere0
- Value
- 20%e0
- Qualifier
- 856e0
- Comparator
- one‐cut systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across N rates, crude protein (CP) concentration for the two‐cut systems was 50% greater (71 g kg −1 ) and acid detergent fiber (ADF) and neutral detergent fiber (NDF) concentrations were 20% lesser (465 and 856 g kg −1 , respectively) than switchgrass in the one‐cut system”
e1“Switchgrass ( Panicum virgatum L.) has potential for both bioenergy and forage”
Claim · model-written summary
Switchgrass harvested from vegetative through boot stage, and its regrowth, could provide forage of acceptable nutritive value to beef cows.
- Taxon
- SwitchgrassPanicum virgatume5
- Outcome
- forage of acceptable nutritive valuee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Switchgrass harvested at vegetative through boot stage and its regrowth could provide forage of acceptable nutritive value to beef cows”
Claim · model-written summary
Greater nutrient removal requires appropriate soil fertility evaluation and fertilizer management for sustainable yields.
- Taxon
- SwitchgrassPanicum virgatume1
- Outcome
- appropriate soil fertility evaluation and fertilizer management for sustainable yieldse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“However, greater nutrient removal requires appropriate soil fertility evaluation and fertilizer management for sustainable yields”
e1“Switchgrass ( Panicum virgatum L.) has potential for both bioenergy and forage”
The same questions in other papers
fertilization · growth · Panicum virgatum (switchgrass)Positive and negative results
9 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
8 papers more in this group
See all 12 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.