Abstract
A greenhouse study was conducted to investigate the effects of nitrogen (N) on wild barley (Hordeum spontaneum Koch) interference with winter wheat (Triticum aestivum var. Pishtaz) by an additive series experiment. The experiment was conducted in a split plot design with 3 replications. Wheat plant height losses were on average 30, 10, and 10% in a wild barley density of 16 plants per pot with an N supply of 40, 80, and 160 mg per kgsoil, respectively. At all N application rates, wheat tillers decreased in the presence of wild barley densities of 4, 8, and 16 plants per pot. Increased N stimulated wheat tiller growth per plant but this effect was reduced by wild barley interference. The highest leaf area was observed at 80 mg N per kg soil for both species in monocultures. Significant differences were observed among wheat dry weight values in all wild barley densities and at each level of N application rate. Shoot N concentration of wild barley was greater than that of wheat. Wild barley competition always reduced shoot N concentration of wheat and this was increased with increasing wild barley density. The results of this study suggested that wild barley is more responsive to soil N levels than wheat.
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Claims 8
Claim · model-written summary
At 16 barley plants per pot, wheat height losses were 30%, 10%, and 10% at 40, 80, and 160 mg N per kgsoil.
- Taxon
- Wheat
Triticum aestivume0 - Interactor
- wild barley
.jpg?width=60)
Hordeum vulgare subsp. spontaneume0weed - Outcome
- plant height lossese0
- Direction
- lossese0
- Qualifier
- 16 plants per pote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Wheat plant height losses were on average 30, 10, and 10% in a wild barley density of 16 plants per pot with an N supply of 40, 80, and 160 mg per kgsoil, respectively.”
Claim · model-written summary
Barley at 4, 8, and 16 plants per pot reduced wheat tillers at all nitrogen rates.
- Taxon
- wheatTriticum aestivume0
- Treatment
- wild barley densities of 4, 8, and 16 plants per pote0
- Interactor
- wild barleyHordeum vulgare subsp. spontaneume0weed
- Outcome
- wheat tillerse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At all N application rates, wheat tillers decreased in the presence of wild barley densities of 4, 8, and 16 plants per pot.”
Claim · model-written summary
Increasing nitrogen stimulated wheat tillers per plant, though barley interference reduced the response.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Increased Ne0
- Interactor
- wild barleyHordeum vulgare subsp. spontaneume0weed
- Outcome
- tiller growth per plante0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased N stimulated wheat tiller growth per plant but this effect was reduced by wild barley interference.”
Claim · model-written summary
Both species had the highest monoculture leaf area at 80 mg N per kg soil.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- 80 mg N per kg soile0
- Outcome
- leaf areae0
- Direction
- higheste0
- Qualifier
- both species in monoculturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest leaf area was observed at 80 mg N per kg soil for both species in monocultures.”
t0“Winter Wheat (Triticum aestivum L.) and Wild Barley (Hordeum spontaneum Koch)”
Claim · model-written summary
Wheat dry weight differed significantly across barley densities and nitrogen rates.
- Taxon
- wheatTriticum aestivume0
- Interactor
- wild barleyHordeum vulgare subsp. spontaneume0weed
- Outcome
- wheat dry weight valuese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant differences were observed among wheat dry weight values in all wild barley densities and at each level of N application rate.”
Claim · model-written summary
Wild barley shoot nitrogen concentration exceeded wheat shoot nitrogen concentration.
- Taxon
- wild barleyHordeum vulgare subsp. spontaneume0
- Outcome
- Shoot N concentratione0
- Direction
- greatere0
- Comparator
- wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot N concentration of wild barley was greater than that of wheat.”
Claim · model-written summary
Wild barley competition reduced wheat shoot nitrogen concentration increasingly with barley density.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Wild barley competitione0
- Interactor
- Wild barleyHordeum vulgare subsp. spontaneume0weed
- Outcome
- shoot N concentration of wheate0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wild barley competition always reduced shoot N concentration of wheat and this was increased with increasing wild barley density.”
Claim · model-written summary
The authors infer that wild barley is more responsive to soil nitrogen than wheat.
- Taxon
- wild barleyHordeum vulgare subsp. spontaneume0
- Outcome
- responsive to soil N levelse0
- Direction
- moree0
- Comparator
- wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wild barley is more responsive to soil N levels than wheat”
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
competition · nutrient: content · Triticum aestivum (wheat)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- 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.