Abstract
The vigour of perennial ryegrass and cocksfoot after spraying with the sodium salt of MCPA during establishment was estimated from their yields in small‐plot cutting experiments on weedy land. Where the weed yields of control plots was of the order of a ton of air‐dry matter an acre (mostly Spergula arvensis L.), spraying at up to 1·2 1b. acid equivalent an acre caused twofold to threefold increases in grass yields. The optimum time to spray perennial ryegrass was at the three‐ to four‐leaf stage or 26 days after sowing; for cocksfoot, which appeared more susceptible to the herbicide, spraying at the tillering stage, or about 40 days after sowing, was best. Increasing the seed rates of ryegrass produced transitory increases in yields while decreasing weed yields. Increasing phosphate or nitrogen caused decreases in weed yields. Although the former gave a large increase in weed yield in the first cut this was offset by a large decrease in the second cut. There was an indication that the level of nitrogenous manuring affected the toxicity of the herbicide to the grasses.
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Claims 9
Claim · model-written summary
MCPA spraying increased grass yields twofold to threefold on weedy land.
- Taxon
- PERENNIAL RYEGRASS AND COCKSFOOTt0
- Treatment
- spraying at up to 1·2 1b. acid equivalent an acree0
- Outcome
- grass yieldse0
- Direction
- increasese0
- Value
- twofold to threefolde0
Not reportedComparator
Verbatim
e0“spraying at up to 1·2 1b. acid equivalent an acre caused twofold to threefold increases in grass yields”
t0“PERENNIAL RYEGRASS AND COCKSFOOT”
Claim · model-written summary
The optimum time to spray perennial ryegrass was at three to four leaves or 26 days after sowing.
- Taxon
- perennial ryegrass
Lolium perennee0 - Organ / stage
- three‐ to four‐leaf stagee0
- Outcome
- optimum time to spraye0
- Value
- 26 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimum time to spray perennial ryegrass was at the three‐ to four‐leaf stage or 26 days after sowing”
Claim · model-written summary
For cocksfoot the best spray time was tillering or about 40 days after sowing.
- Taxon
- cocksfoot
.jpg?width=60)
Dactylis glomeratae0 - Outcome
- spraying at the tillering stage, or about 40 days after sowing, was beste0
- Value
- about 40 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“for cocksfoot, which appeared more susceptible to the herbicide, spraying at the tillering stage, or about 40 days after sowing, was best”
Claim · model-written summary
Increasing ryegrass seed rates transiently increased yields.
LoliumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the seed rates of ryegrass produced transitory increases in yields”
Claim · model-written summary
Increasing ryegrass seed rates decreased weed yields.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the seed rates of ryegrass produced transitory increases in yields while decreasing weed yields”
Claim · model-written summary
Increasing phosphate decreased weed yields.
- Taxon
- PERENNIAL RYEGRASSLolium perennet0
- Treatment
- Increasing phosphatee0
- Interactor
- weede0weed
- Outcome
- weed yieldse0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing phosphate or nitrogen caused decreases in weed yields”
t0“PERENNIAL RYEGRASS”
Claim · model-written summary
Increasing nitrogen decreased weed yields.
- Taxon
- PERENNIAL RYEGRASSLolium perennet0
- Treatment
- nitrogene0
- Interactor
- weede0weed
- Outcome
- weed yieldse0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing phosphate or nitrogen caused decreases in weed yields”
t0“PERENNIAL RYEGRASS”
Claim · model-written summary
Phosphate increased weed yield in the first cut.
- Taxon
- PERENNIAL RYEGRASSLolium perennet0
- Treatment
- phosphatee1
- Outcome
- weed yielde0
- Direction
- increasee0
- Qualifier
- first cute0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although the former gave a large increase in weed yield in the first cut”
e1“Increasing phosphate or nitrogen caused decreases in weed yields”
t0“PERENNIAL RYEGRASS”
Claim · model-written summary
Phosphate decreased weed yield in the second cut.
- Taxon
- PERENNIAL RYEGRASSLolium perennet0
- Outcome
- weed yielde1
- Direction
- decreasee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this was offset by a large decrease in the second cut”
e1“Although the former gave a large increase in weed yield in the first cut”
t0“PERENNIAL RYEGRASS”
The same questions in other papers
phosphorus · weed · Lolium perenne (perennial ryegrass)Positive and negative results
1 in the opposite direction
- negative
density · weed · LoliumPositive and negative results
1 reporting no difference from an alternative
- no effect
density · yield · LoliumPositive and negative results
2 in the opposite direction
- no effect
- no effect
application · yield · Lolium perenne (perennial ryegrass)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
1 paper more in this group
See all 5 papers →application · yield · Dactylis glomerata (cocksfoot)Results agree
1 paper in the same direction as this paper
- positive
nitrogen · weed · Lolium perenne (perennial ryegrass)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.