Abstract
Field experiment was conducted at Karaj, Iran to evaluate the growth and yield responses of winter wheat tovarious densities of wild barley and nitrogen (N) application rates. The experimental design was split-plot with 3replications. The main factor was four N levels of 0, 130, 260, and 390 kg Urea per ha and the sub factor was weeddensities. Results showed that in unfertilized plots, wild barley densities of 80 and 160 plants per sq. metersignificantly decreased wheat plant height, LAI and tillers. In comparison to excess N and N deficiency treatments,the optimal N rate decreased wheat LAI losses at weed densities of 80 and 160 plants per sq. m. Wild barley hadgreater plant height and the number of tillers per plant at densities of 20 and 40 plants per sq. meter. At 130 kg Nper ha, weed densities of 20, 40, and 80 plants per sq. meter did not reduce the number of crop ear compared tohand-weeded plots. On unfertilized plots with 40, 80, and 160 weed plants per sq. meter, the reduction in numberof grains per ear were 18 and 38%, respectively. Nitrogen rates of 130 and 260 kg per ha increased crop and weedGNCs, whereas their STNCs were increased by N rate up to of 390 kg per ha. Added N resulted in higher winterwheat ANUE compared to weed ANUE.
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Claims 6
Claim · model-written summary
In unfertilized plots, wild barley at 80 and 160 plants per square meter significantly decreased wheat plant height, LAI and tillers.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- wild barley densities of 80 and 160 plants per sq. metere0
- Interactor
- wild barley
.jpg?width=60)
Hordeum vulgare subsp. spontaneume0weed - Outcome
- plant height, LAI and tillerse1
- Direction
- decreasede1
- Qualifier
- in unfertilized plotse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“in unfertilized plots, wild barley densities of 80 and 160 plants per sq. meter”
e1“significantly decreased wheat plant height, LAI and tillers”
Claim · model-written summary
Wild barley at 20 and 40 plants per square meter had greater plant height and more tillers per plant.
- Taxon
- Winter WheatTriticum aestivumt0
- Interactor
- wild barleyHordeum vulgare subsp. spontaneume1weed
- Outcome
- plant height and the number of tillers per plante0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat Growth and Yield”
e0“greater plant height and the number of tillers per plant at densities of 20 and 40 plants per sq. meter”
e1“in unfertilized plots, wild barley densities of 80 and 160 plants per sq. meter”
Claim · model-written summary
At 130 kg N per ha, weed densities of 20, 40 and 80 plants per square meter did not reduce crop ear number compared with hand-weeded plots.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- weed densities of 20, 40, and 80 plants per sq. metere0
- Interactor
- weede0weed
- Outcome
- number of crop eare0
- Direction
- did not reducee0
- Qualifier
- At 130 kg Ne2
- Comparator
- hand-weeded plotse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat Growth and Yield”
e0“weed densities of 20, 40, and 80 plants per sq. meter did not reduce the number of crop ear”
e1“hand-weeded plots”
e2“At 130 kg N”
Claim · model-written summary
Nitrogen rates of 130 and 260 kg per ha increased crop and weed GNCs.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- Nitrogen rates of 130 and 260 kg per hae0
- Interactor
- weede0weed
- Outcome
- GNCse1
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat Growth and Yield”
e0“Nitrogen rates of 130 and 260 kg per ha increased crop and weed”
e1“GNCs, whereas their STNCs were increased by N rate up to of 390 kg per ha”
Claim · model-written summary
N rate up to 390 kg per ha increased STNCs.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- N rate up to of 390 kg per hae1
- Outcome
- STNCse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat Growth and Yield”
e1“GNCs, whereas their STNCs were increased by N rate up to of 390 kg per ha”
Claim · model-written summary
Added N resulted in higher winter wheat ANUE than weed ANUE.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- Added Ne0
- Interactor
- weede1weed
- Outcome
- ANUEe1
- Direction
- highere0
- Comparator
- weed ANUEe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat Growth and Yield”
e0“Added N resulted in higher”
e1“compared to weed ANUE”
The same questions in other papers
Hordeum vulgare subsp. spontaneum · yield · Triticum aestivum (wheat)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
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.