Abstract
SUMMARY Wheat ( Triticum aestivum L.) variety mixtures represent a relatively unexplored avenue for maintaining and stabilizing yield for both organic and conventional producers. The present study examined the responses of three Canadian western red spring wheat varieties in sole crop and in variety mixtures to varying levels of simulated and natural competition, as well as environmental stress at one conventionally and two organically managed locations in central Alberta, Canada, between 2003 and 2005. Three modern hard red spring wheat varieties (Superb, semi-dwarf; AC Intrepid, early maturing and 5600HR, tall), along with 13 two- and three-way variety mixtures, were planted under two levels of simulated weed ( Brassica juncea L.) competition at each of the eight location-years. The B. juncea weed competition treatment decreased yields at all locations. Overall yield was lowest at the certified organic farm and highest under conventional management. Sole-crop semi-dwarf Superb and all three Superb–Intrepid mixture entries consistently yielded among the highest, regardless of management system, testing location or competition treatment. The 1:1 and 1:2 Superb–Intrepid mixture entries were the most stable of all entries tested. Early season vigour was strongly associated with yield, with the strongest correlation occurring under low-moisture, low-nutrient, high-competition conditions at the certified organic farm. Spring wheat variety mixtures may provide greater stability with little or no reduction in yield, while providing greater competitive ability.
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Claims 9
Claim · model-written summary
B. juncea competition decreased wheat yield at all locations.
- Taxon
- Wheat
Triticum aestivume1 - Treatment
- B. juncea weed competition treatmente0
- Interactor
- B. juncea
Brassica junceae0weed - Outcome
- yieldse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The B. juncea weed competition treatment decreased yields at all locations.”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Wheat yield was lowest at the certified organic farm.
- Taxon
- WheatTriticum aestivume1
- Outcome
- Overall yielde0
- Direction
- loweste0
- Setting
- certified organic farme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Overall yield was lowest at the certified organic farm”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Wheat yield was highest under conventional management.
- Taxon
- WheatTriticum aestivume2
- Outcome
- Overall yielde1
- Direction
- higheste0
- Setting
- conventional managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest under conventional management”
e1“Overall yield was lowest at the certified organic farm and highest under conventional management”
e2“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Sole-crop Superb was consistently among the highest yielding entries.
- Taxon
- WheatTriticum aestivume1
- Material
- Superbe0
- Outcome
- yielded among the higheste0
- Direction
- higheste0
- Qualifier
- regardless of management system, testing location or competition treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sole-crop semi-dwarf Superb and all three Superb–Intrepid mixture entries consistently yielded among the highest, regardless of management system, testing location or competition treatment”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
All three Superb–Intrepid mixtures consistently yielded among the highest.
- Taxon
- WheatTriticum aestivume1
- Material
- Superb–Intrepid mixture entriese0
- Outcome
- yielded among the higheste0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all three Superb–Intrepid mixture entries consistently yielded among the highest, regardless of management system, testing location or competition treatment”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
The 1:1 Superb–Intrepid mixture was among the most stable entries.
- Taxon
- WheatTriticum aestivume1
- Material
- 1:1e0
- Outcome
- stablee0
- Direction
- moste0
- Comparator
- all entries testede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 1:1 and 1:2 Superb–Intrepid mixture entries were the most stable of all entries tested”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
The 1:2 Superb–Intrepid mixture was among the most stable entries.
- Taxon
- WheatTriticum aestivume1
- Material
- 1:2 Superb–Intrepid mixture entriese0
- Outcome
- stablee0
- Direction
- moste0
- Comparator
- all entries testede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 1:1 and 1:2 Superb–Intrepid mixture entries were the most stable of all entries tested”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Early season vigour was strongly associated with wheat yield, especially at the dry, nutrient-poor, high-competition organic farm.
- Taxon
- WheatTriticum aestivume1
- Organ / stage
- Early seasone0
- Outcome
- yielde0
- Qualifier
- low-moisture, low-nutrient, high-competition conditionse0
- Setting
- certified organic farme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early season vigour was strongly associated with yield, with the strongest correlation occurring under low-moisture, low-nutrient, high-competition conditions at the certified organic farm”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
The authors suggest wheat variety mixtures may increase stability with little yield loss and greater competitiveness.
- Taxon
- Spring wheatTriticum aestivume0
- Outcome
- Spring wheat variety mixtures may provide greater stability with little or no reduction in yield, while providing greater competitive abilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat variety mixtures may provide greater stability with little or no reduction in yield, while providing greater competitive ability”
The same questions in other papers
Brassica juncea · yield · Triticum aestivum (wheat)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →competition · yield · Triticum aestivum (wheat)Results differ
31 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
31 papers more in this group
See all 35 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.