Abstract
Abstract Grain yields of winter wheat ( Triticum aestivum L.) may increase as the spacing between rows is decreased. Results in previous studies have varied with other management variables and environments, however, and only one or a few wheat genotypes were used in any one study. We used a wide genetic base of 16 cultivars to obtain estimates of yield response at two row spacings and two seeding rates to determine if there was a consistent response across cultivars and years. Row spacings of 64 and 192 mm were compared at seeding rates of 377 and 538 kernels m −2 . There were large year ✕ row spacing and year ✕ seeding rate interactions. The narrow row spacing treatments averaged 6.8 and 5.3% more grain than the standard spacing in 1983 and 1984, respectively. Cultivar responses to narrow row spacing ranged from 1.1 to 17.4% in 1983, and from −8.0 to 19.7% in 1984. No response to seeding rate was observed in 1983, but the higher seeding rate yielded 7.1% more grain in 1984 when tillering was low. A significant row spacing ✕ seeding rate interaction was detected over both years as 9.1% increase in grain yield was observed with both narrow row spacing and high seeding rate compared to wide row spacing and low seeding rate. We concluded that (i) row spacings narrower than the conventional 192‐mm spacing have the potential to significantly increase grain yields, but the response may vary depending on the cultivar and environmental conditions, and (ii) a combination of increased seeding rate and narrow row spacing is important for increasing grain yield.
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Claims 12
Claim · model-written summary
Year interacted strongly with row spacing for yield.
- Taxon
- winter wheat
Triticum aestivumt0 - Treatment
- row spacinge0
- Outcome
- year ✕ row spacinge0
- Setting
- yeare0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were large year ✕ row spacing and year ✕ seeding rate interactions”
t0“Winter Wheat”
Claim · model-written summary
Year interacted strongly with seeding rate for yield.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- seeding ratee0
- Outcome
- year ✕ seeding ratee0
- Setting
- yeare0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were large year ✕ row spacing and year ✕ seeding rate interactions”
t0“Winter Wheat”
Claim · model-written summary
Narrow rows averaged 6.8 percent more grain than standard spacing in 1983.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- narrow row spacinge0
- Outcome
- graine0
- Direction
- moree0
- Value
- 6.8e0
- Qualifier
- 1983e0
- Comparator
- standard spacinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The narrow row spacing treatments averaged 6.8 and 5.3% more grain than the standard spacing in 1983 and 1984, respectively”
t0“Winter Wheat”
Claim · model-written summary
Narrow rows averaged 5.3 percent more grain than standard spacing in 1984.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- narrow row spacinge0
- Outcome
- graine0
- Direction
- moree0
- Value
- 5.3%e0
- Qualifier
- 1984e0
- Comparator
- standard spacinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The narrow row spacing treatments averaged 6.8 and 5.3% more grain than the standard spacing in 1983 and 1984, respectively”
t0“Winter Wheat”
Claim · model-written summary
Cultivar yield response to narrow rows ranged from 1.1 to 17.4 percent in 1983.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- narrow row spacinge0
- Outcome
- Cultivar responsese0
- Value
- 1.1 to 17.4%e0
- Qualifier
- 1983e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivar responses to narrow row spacing ranged from 1.1 to 17.4% in 1983”
t0“Winter Wheat”
Claim · model-written summary
Cultivar yield response to narrow rows ranged from minus 8.0 to 19.7 percent in 1984.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- narrow row spacinge0
- Outcome
- Cultivar responsese0
- Value
- −8.0 to 19.7%e0
- Qualifier
- 1984e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivar responses to narrow row spacing ranged from 1.1 to 17.4% in 1983, and from −8.0 to 19.7% in 1984”
t0“Winter Wheat”
Claim · model-written summary
Seeding rate had no observed response in 1983.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- seeding ratee0
- Outcome
- responsee0
- Direction
- No responsee0
- Qualifier
- 1983e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No response to seeding rate was observed in 1983”
t0“Winter Wheat”
Claim · model-written summary
Higher seeding rate yielded 7.1 percent more grain in low-tillering 1984.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- higher seeding ratee0
- Outcome
- graine0
- Direction
- moree0
- Value
- 7.1%e0
- Qualifier
- when tillering was lowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the higher seeding rate yielded 7.1% more grain in 1984 when tillering was low”
t0“Winter Wheat”
Claim · model-written summary
Row spacing interacted significantly with seeding rate across both years.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- row spacinge0
- Outcome
- row spacing ✕ seeding rate interactione0
- Qualifier
- over both yearse0
- Comparator
- seeding ratee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant row spacing ✕ seeding rate interaction was detected over both years”
t0“Winter Wheat”
Claim · model-written summary
Narrow rows plus high seeding yielded 9.1 percent more grain than wide rows plus low seeding.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- narrow row spacing and high seeding ratee0
- Outcome
- grain yielde0
- Direction
- increasee0
- Value
- 9.1%e0
- Comparator
- wide row spacing and low seeding ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“9.1% increase in grain yield was observed with both narrow row spacing and high seeding rate compared to wide row spacing and low seeding rate”
t0“Winter Wheat”
Claim · model-written summary
Authors concluded rows narrower than 192 mm can raise yield, depending on cultivar and environment.
- Taxon
- winter wheatTriticum aestivumt0
- Outcome
- row spacings narrower than the conventional 192‐mm spacinge0
- Qualifier
- response may vary depending on the cultivar and environmental conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“row spacings narrower than the conventional 192‐mm spacing have the potential to significantly increase grain yields, but the response may vary depending on the cultivar and environmental conditions”
t0“Winter Wheat”
Claim · model-written summary
Authors concluded that increased seeding combined with narrow rows is important for increasing yield.
- Taxon
- winter wheatTriticum aestivumt0
- Outcome
- a combination of increased seeding rate and narrow row spacinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a combination of increased seeding rate and narrow row spacing is important for increasing grain yield”
t0“Winter Wheat”
The same questions in other papers
density · yield · Triticum aestivum (wheat)Positive and negative results
375 papers in the same direction as this paper · 115 in the opposite direction · 7 reporting no difference from an alternative
- no effect
- negative
- negative
494 papers more in this group
See all 498 papers →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.