Abstract
Yields of pure stands of alfalfa (Medicago media Pers.) and bromegrass (Bromus inermis Leyss.) established on summer fallow with and without a wheat (Triticum aestivum L.) companion crop were compared at Melfort in three tests, each maintained for 4 yr. In two experiments out of three, yields over the 4-yr period were greater when the alfalfa or bromegrass was seeded alone; bromegrass produced more dry matter than alfalfa. Both forages produced much more dry matter in the seedling year when seeded without a cover crop, and this effect carried over into the first harvest year. In the second and third crop years, bromegrass seeded with wheat produced more dry matter than when seeded alone, whereas seeding method had no significant influence on alfalfa production. Seeding the wheat at 50 kg/ha, half the normal rate, did not improve forage establishment significantly, and made no consistent difference in the amount of grain produced. In all three experiments, soil fertility was high, and moisture was adequate for seedling establishment. It is argued that low light levels under the companion crop were the primary cause of poorer seedling growth in these conditions.Key words: Bromegrass, alfalfa, spring wheat, companion crops, forage yield, forage establishment
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Claims 10
Claim · model-written summary
Alfalfa seeded alone had greater four-year yield in two of three experiments.
- Taxon
- ALFALFA
Medicago sativat0 - Treatment
- seeded alonee0
- Outcome
- yields over the 4-yr periode0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In two experiments out of three, yields over the 4-yr period were greater when the alfalfa or bromegrass was seeded alone”
t0“BROMEGRASS AND ALFALFA”
Claim · model-written summary
Bromegrass seeded alone had greater four-year yield in two of three experiments.
Not reportedComparator
Verbatim
e0“In two experiments out of three, yields over the 4-yr period were greater when the alfalfa or bromegrass was seeded alone”
t0“BROMEGRASS AND ALFALFA”
Claim · model-written summary
Bromegrass produced more dry matter than alfalfa.
Verbatim
e0“bromegrass produced more dry matter than alfalfa”
Claim · model-written summary
Alfalfa seeded without a cover crop produced more dry matter in the seedling year and first harvest year.
- Taxon
- ALFALFAMedicago sativat0
- Treatment
- seeded without a cover crope0
- Outcome
- dry mattere0
- Direction
- moree0
- Qualifier
- first harvest yeare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both forages produced much more dry matter in the seedling year when seeded without a cover crop, and this effect carried over into the first harvest year”
t0“BROMEGRASS AND ALFALFA”
Claim · model-written summary
Bromegrass seeded without a cover crop produced more dry matter in the seedling year and first harvest year.
Not reportedComparator
Verbatim
e0“Both forages produced much more dry matter in the seedling year when seeded without a cover crop, and this effect carried over into the first harvest year”
t0“BROMEGRASS AND ALFALFA”
Claim · model-written summary
In the second and third crop years bromegrass seeded with wheat produced more dry matter than bromegrass seeded alone.
Verbatim
e0“In the second and third crop years, bromegrass seeded with wheat produced more dry matter than when seeded alone”
Claim · model-written summary
Seeding method had no significant influence on alfalfa production in the second and third crop years.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- seeding methode0
- Outcome
- alfalfa productione0
- Direction
- no significant influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the second and third crop years, bromegrass seeded with wheat produced more dry matter than when seeded alone, whereas seeding method had no significant influence on alfalfa production”
Claim · model-written summary
Seeding wheat at 50 kg/ha did not significantly improve forage establishment.
- Taxon
- ALFALFAMedicago sativat0
- Treatment
- Seeding the wheat at 50 kg/hae0
- Outcome
- forage establishmente0
- Direction
- did not improvee0
- Comparator
- half the normal ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeding the wheat at 50 kg/ha, half the normal rate, did not improve forage establishment significantly”
t0“BROMEGRASS AND ALFALFA”
Claim · model-written summary
Seeding wheat at 50 kg/ha made no consistent difference to grain production.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- Seeding the wheat at 50 kg/hae0
- Outcome
- amount of grain producede0
- Direction
- no consistent differencee0
- Comparator
- half the normal ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeding the wheat at 50 kg/ha, half the normal rate, did not improve forage establishment significantly, and made no consistent difference in the amount of grain produced”
Claim · model-written summary
The authors attributed poorer seedling growth under the companion crop primarily to low light.
- Taxon
- ALFALFAMedicago sativat0
- Outcome
- poorer seedling growthe0
- Qualifier
- low light levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low light levels under the companion crop were the primary cause of poorer seedling growth in these conditions”
t0“BROMEGRASS AND ALFALFA”
The same questions in other papers
Triticum aestivum · growth · Medicago sativa (alfalfa)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
cover crop · growth · Medicago sativa (alfalfa)Positive and negative results
2 in the opposite direction
- negative
- no effect
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.