Abstract
Abstract During 1962 and 1963 we obtained estimates of herbage yield before grazing from mower‐strips in orchardgrass and Kentucky bluegrass pastures. Mower‐strips were 13 inches wide and ranged from 1 to 10 sample units (4 to 40 feet) in length. A maximum of 10 mower‐strips were harvested within 0.83 acre paddocks of each grass. Since estimates of σ 2 strips and σ 2 units in strips varied from year to year, it is suggested that the optimum size of sample for mower‐strip sampling of pastures should be determined each season. The .95 confidence intervals for herbage yield tended to decrease with an increase in sample size. Confidence intervals and estimates of the variance of an over‐all mean were reduced more by increasing the number of mower‐strips per paddock than from an equivalent increase in number of sample units per strip. If estimates of herbage yield are to be obtained for the purpose of adjusting grazing pressures on pastures, there appears little practical advantage in harvesting more than 7 mower‐strips 16 to 40 feet long.
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Claims 4
Claim · model-written summary
The optimum mower-strip sample size for pasture herbage yield should be determined each season.
- Taxon
- orchardgrass and Kentucky bluegrass
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Dactylis glomerata.jpg?width=60)
Poa pratensise0 - Outcome
- optimum size of samplee1
- Qualifier
- should be determined each seasone2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
.jpg?width=500)
Verbatim
e0“in orchardgrass and Kentucky bluegrass pastures”
e1“it is suggested that the optimum size of sample”
e2“should be determined each season”
Claim · model-written summary
Confidence intervals for herbage yield tended to decrease as sample size increased.
- Taxon
- orchardgrass and Kentucky bluegrassDactylis glomerataPoa pratensise0
- Treatment
- an increase in sample sizee3
- Outcome
- .95 confidence intervals for herbage yielde3
- Direction
- tended to decreasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in orchardgrass and Kentucky bluegrass pastures”
e3“The .95 confidence intervals for herbage yield tended to decrease with an increase in sample size”
Claim · model-written summary
Increasing the number of mower-strips per paddock reduced confidence intervals more than an equivalent increase in sample units per strip.
- Taxon
- orchardgrass and Kentucky bluegrassDactylis glomerataPoa pratensise0
- Treatment
- increasing the number of mower‐strips per paddocke4
- Outcome
- Confidence intervalse7
- Direction
- reduced moree4
- Comparator
- an equivalent increase in number of sample units per stripe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in orchardgrass and Kentucky bluegrass pastures”
e4“were reduced more by increasing the number of mower‐strips per paddock than from an equivalent increase in number of sample units per strip”
e7“Confidence intervals and estimates of the variance”
Claim · model-written summary
Harvesting more than 7 mower-strips offers little practical advantage for pasture yield estimates.
- Taxon
- orchardgrass and Kentucky bluegrassDactylis glomerataPoa pratensise0
- Outcome
- practical advantage in harvesting more than 7e5
- Qualifier
- 16 to 40 feet longe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in orchardgrass and Kentucky bluegrass pastures”
e5“there appears little practical advantage in harvesting more than 7”
e6“16 to 40 feet long”