Abstract
Summary. The average air‐dry yield of weeds on fallow plots was about four times as large (2660 kg/ha) as the yield of weeds which developed among spring cereal crops (740 kg/ha). Application of fertilizers increased the number of weeds and their average weight on both irrigated and non‐irrigated plots. Treatment with MCPA reduced the weed yield to 36% on fallow plots and to 26% on weedy cereal plots. It was more effective on fertilized plots than on unfertilized plots, but irrigation made little difference to its effectiveness. The space left by the destroyed weeds was mainly occupied by Agropyron repens . Oats were better able to compete with weeds than were wheat and barley. On unfertilized and non‐irrigated plots spraying with MCPA (1‐26 kg/ha) at the beginning of shooting significantly reduced the yields of weed‐free barley. The yields of sprayed oats and wheat were also below the yields from the unsprayed although the reductions were not significant at the 5% level. However, on a number of fertilized and irrigated plots, both weedy and hand‐weeded , on which the plants had better growing conditions, MCPA resulted in a significant increase in the grain yield of barley and oats. Influence de l'irrigation, de la fertilisation et du MCPA sur la compétition entre céréales de printemps et mauvaises herbes
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Claims 14
Claim · model-written summary
Weed yield was about four times greater on fallow than cereal plots.
Verbatim
e0“average air‐dry yield of weeds on fallow plots was about four times as large (2660 kg/ha) as the yield of weeds which developed among spring cereal crops (740 kg/ha)”
Claim · model-written summary
Fertilizer increased weed number on irrigated and non-irrigated plots.
- Taxon
- SPRING CEREALSt0
- Treatment
- fertilizerse0
- Interactor
- weedse0weed
- Outcome
- number of weedse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Application of fertilizers increased the number of weeds and their average weight on both irrigated and non‐irrigated plots”
t0“SPRING CEREALS AND WEEDS”
Claim · model-written summary
Fertilizer increased average weed weight on irrigated and non-irrigated plots.
- Taxon
- SPRING CEREALSt0
- Treatment
- fertilizerse0
- Interactor
- weedse0weed
- Outcome
- average weight on both irrigated and non‐irrigated plotse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Application of fertilizers increased the number of weeds and their average weight on both irrigated and non‐irrigated plots”
t0“SPRING CEREALS AND WEEDS”
Claim · model-written summary
MCPA reduced weed yield on fallow plots to 36%.
- Taxon
- SPRING CEREALSt0
- Treatment
- MCPAe0
- Interactor
- weede0weed
- Outcome
- weed yielde0
- Direction
- reducede0
- Value
- 36%e0
- Setting
- fallow plotse0
Not reportedComparator
Verbatim
e0“Treatment with MCPA reduced the weed yield to 36% on fallow plots”
t0“SPRING CEREALS AND WEEDS”
Claim · model-written summary
MCPA reduced weed yield on cereal plots to 26%.
- Taxon
- SPRING CEREALSt0
- Treatment
- MCPAe0
- Interactor
- weede0weed
- Outcome
- weed yielde0
- Direction
- reducede0
- Value
- 26%e0
- Setting
- weedy cereal plotse0
Not reportedComparator
Verbatim
e0“Treatment with MCPA reduced the weed yield to 36% on fallow plots and to 26% on weedy cereal plots”
t0“SPRING CEREALS AND WEEDS”
Claim · model-written summary
MCPA was more effective on fertilized than unfertilized plots.
Verbatim
e0“It was more effective on fertilized plots than on unfertilized plots”
e1“Treatment with MCPA reduced the weed yield”
t0“SPRING CEREALS AND WEEDS”
Claim · model-written summary
Irrigation made little difference to MCPA effectiveness.
Verbatim
e0“irrigation made little difference to its effectiveness”
e1“Treatment with MCPA reduced the weed yield”
t0“SPRING CEREALS AND WEEDS”
Claim · model-written summary
Agropyron repens mainly occupied space left by destroyed weeds.
- Taxon
- SPRING CEREALSt0
- Interactor
- Agropyron repens
Elymus repense0weed - Outcome
- space left by the destroyed weeds was mainly occupied by Agropyron repense0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The space left by the destroyed weeds was mainly occupied by Agropyron repens”
t0“SPRING CEREALS AND WEEDS”
Claim · model-written summary
Oats competed with weeds better than wheat and barley.
- Taxon
- Oats
Avena sativae0 - Interactor
- weedse0weed
- Outcome
- compete with weedse0
- Direction
- bettere0
- Comparator
- wheat and barleye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oats were better able to compete with weeds than were wheat and barley”
Claim · model-written summary
MCPA significantly reduced weed-free barley yield on unfertilized, unirrigated plots.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- MCPA (1‐26 kg/ha)e0
- Outcome
- yields of weed‐free barleye0
- Direction
- reducede0
- Setting
- unfertilized and non‐irrigated plotse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“On unfertilized and non‐irrigated plots spraying with MCPA (1‐26 kg/ha) at the beginning of shooting significantly reduced the yields of weed‐free barley”
Claim · model-written summary
MCPA reduced oat yield, but not significantly.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yields of sprayed oats and wheat were also below the yields from the unsprayed although the reductions were not significant at the 5% level”
Claim · model-written summary
MCPA reduced wheat yield, but not significantly.
Triticum aestivumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yields of sprayed oats and wheat were also below the yields from the unsprayed although the reductions were not significant at the 5% level”
Claim · model-written summary
MCPA significantly increased barley grain yield on some fertilized, irrigated plots.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- MCPAe0
- Outcome
- grain yield of barleye0
- Direction
- increasee0
- Setting
- fertilized and irrigated plotse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on a number of fertilized and irrigated plots, both weedy and hand‐weeded , on which the plants had better growing conditions, MCPA resulted in a significant increase in the grain yield of barley and oats”
Claim · model-written summary
MCPA significantly increased oat grain yield on some fertilized, irrigated plots.
- Taxon
- oatsAvena sativae0
- Treatment
- MCPAe0
- Outcome
- grain yield of barley and oatse0
- Direction
- increasee0
- Setting
- fertilized and irrigated plotse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on a number of fertilized and irrigated plots, both weedy and hand‐weeded , on which the plants had better growing conditions, MCPA resulted in a significant increase in the grain yield of barley and oats”
The same questions in other papers
(4-chloro-2-methylphenoxy)acetic acid · yield · Hordeum vulgare (barley)Results differ
3 in the opposite direction
- no effect
- no effect
- negative
(4-chloro-2-methylphenoxy)acetic acid · yield · Avena sativa (oats)Results differ
4 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
2 papers more in this group
See all 6 papers →(4-chloro-2-methylphenoxy)acetic acid · weed · Hordeum vulgare (barley)Positive and negative results
1 in the opposite direction
- 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.