Abstract
The effects of nitrogen and wear stress on the growth of Penncross creeping bent-grass (Agrostis palustris Huds.) maintained as a putting green was evaluated from June 1978 to November 1979. The 8-yr-old sward was grown on a Fox sandy loam, mowed five times weekly and irrigated as required. Nitrogen was applied as ammonium nitrate at 1.5, 3.0 and 6 kg N∙100 m −2 . Wear treatments, applied for specific periods of time, were zero, three and six passes per day. Turf injury was due to direct wear stress rather than soil compaction as the soil bulk density was unaltered by wear treatment. As wear treatments increased, thatch thickness, clipping yields and healing potential decreased. Electrical resistance measurements of leaf tissue decreased as wear stress increased. This technique provided a rapid and reliable estimate of leaf injury from wear stress. Nitrogen at 3 kg∙100 m −2 increased healing potential, turf greenness and root production over the zero N treatment. However, 6 kg N∙100∙m −2 was excessive. Despite the significant increase in green color, there was no significant increase in healing potential and root growth over the 3-kg rate and the annual bluegrass content of the turf was increased.Key words: Annual bluegrass, thatch, healing potential
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Claims 8
Claim · model-written summary
Turf injury was attributable to direct wear stress rather than compaction.
- Taxon
- CREEPING BENTGRASS
Agrostis stoloniferat0 - Treatment
- wear stresse0
- Outcome
- Turf injurye0
- Direction
- due toe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Turf injury was due to direct wear stress rather than soil compaction as the soil bulk density was unaltered by wear treatment”
t0“CREEPING BENTGRASS”
Claim · model-written summary
Wear treatment did not change soil bulk density.
- Taxon
- CREEPING BENTGRASSAgrostis stoloniferat0
- Treatment
- wear treatmente0
- Outcome
- soil bulk densitye0
- Direction
- unalterede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil bulk density was unaltered by wear treatment”
t0“CREEPING BENTGRASS”
Claim · model-written summary
Increasing wear reduced thatch thickness, clipping yields and healing potential.
- Taxon
- CREEPING BENTGRASSAgrostis stoloniferat0
- Treatment
- wear treatmentse0
- Outcome
- thatch thickness, clipping yields and healing potentiale0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As wear treatments increased, thatch thickness, clipping yields and healing potential decreased”
t0“CREEPING BENTGRASS”
Claim · model-written summary
Leaf electrical resistance decreased with greater wear stress.
- Taxon
- CREEPING BENTGRASSAgrostis stoloniferat0
- Treatment
- wear stresse0
- Outcome
- Electrical resistance measurements of leaf tissuee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Electrical resistance measurements of leaf tissue decreased as wear stress increased”
t0“CREEPING BENTGRASS”
Claim · model-written summary
Electrical resistance rapidly and reliably estimated leaf wear injury.
- Taxon
- CREEPING BENTGRASSAgrostis stoloniferat0
- Outcome
- estimate of leaf injurye0
- Direction
- rapid and reliablee0
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This technique provided a rapid and reliable estimate of leaf injury from wear stress”
t0“CREEPING BENTGRASS”
Claim · model-written summary
Nitrogen at 3 kg∙100 m −2 increased healing potential, greenness and root production versus zero N.
- Taxon
- CREEPING BENTGRASSAgrostis stoloniferat0
- Treatment
- Nitrogen at 3 kg∙100 m −2e0
- Outcome
- healing potential, turf greenness and root productione0
- Direction
- increasede0
- Comparator
- zero N treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen at 3 kg∙100 m −2 increased healing potential, turf greenness and root production over the zero N treatment”
t0“CREEPING BENTGRASS”
Claim · model-written summary
At 6 kg N, healing potential and root growth did not significantly increase over the 3-kg rate.
- Taxon
- CREEPING BENTGRASSAgrostis stoloniferat0
- Treatment
- 3-kg ratee0
- Outcome
- healing potential and root growthe0
- Direction
- no significant increasee0
- Comparator
- 3-kg ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no significant increase in healing potential and root growth over the 3-kg rate”
t0“CREEPING BENTGRASS”
Claim · model-written summary
The 6-kg N rate increased annual bluegrass content.
- Taxon
- CREEPING BENTGRASSAgrostis stoloniferat0
- Treatment
- annual bluegrass contente0
- Outcome
- annual bluegrass contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the annual bluegrass content of the turf was increased”
t0“CREEPING BENTGRASS”