Abstract
Abstract Little information is available regarding the relationships of alfalfa ( Medicago sativa L.) forage yield with yield components in seed‐established stands grown under dryland conditions. Field experiments that included two cultivars and 15 seeding rates ranging from m 2.2 to 33.6 kg pure live seed ha −1 were established in 1985 at Brookings and Highmore, SD. The objective was to determine seeding rate effects on components of alfalfa forage yield and on plant morphology several years after establishment. In the seeding year, plant density increased linearly with seeding rate at both locations. Yield components were determined in 1988 and 1989. Mean alfalfa yield during 1988 and 1989 was optimum at the 13.4 kg pure live seed ha −1 rate at Brookings, but did not respond to seeding rate at Highmore. Plant density continued to be affected by seeding rate 4 yr after establishment, but greater mortality at high seeding rates caused the response to deviate from linearity. Shoots per plant were negatively correlated with plant density ( r = –0.73, P = 0.01). Shoot weight did not respond to seeding rate at Brookings but declined linearly with seeding rate at Highmore. Nevertheless, path analysis suggested that shoot weight was the major influence on alfalfa yield at both locations. Leaf‐to‐stem ratio and shoot length were not affected by seeding rate. Alfalfa yield components are affected similarly by plant density in seed‐established and transplanted stands. Although yield may not be affected by plant density, shoot weight may be affected because of differences in plant competition.
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Claims 13
Claim · model-written summary
Mean alfalfa yield in 1988 and 1989 was optimum at 13.4 kg pure live seed ha -1 at Brookings.
- Taxon
- Medicago sativa
Medicago sativae1 - Treatment
- seeding ratee2
- Outcome
- Mean alfalfa yielde2
- Direction
- optimume2
- Value
- 13.4 kg pure live seed ha −1e2
- Setting
- Brookingse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e2“Mean alfalfa yield during 1988 and 1989 was optimum at the 13.4 kg pure live seed ha −1 rate at Brookings, but did not respond to seeding rate at Highmore”
Claim · model-written summary
Mean alfalfa yield in 1988 and 1989 did not respond to seeding rate at Highmore.
- Taxon
- Medicago sativaMedicago sativae1
- Treatment
- seeding ratee2
- Outcome
- Mean alfalfa yielde2
- Direction
- did not responde2
- Setting
- Highmoree2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e2“Mean alfalfa yield during 1988 and 1989 was optimum at the 13.4 kg pure live seed ha −1 rate at Brookings, but did not respond to seeding rate at Highmore”
Claim · model-written summary
In the seeding year, plant density increased linearly with seeding rate at both locations.
- Taxon
- Medicago sativaMedicago sativae1
- Treatment
- seeding ratee3
- Outcome
- plant densitye3
- Direction
- increasede3
- Setting
- both locationse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e3“In the seeding year, plant density increased linearly with seeding rate at both locations”
Claim · model-written summary
Plant density continued to be affected by seeding rate 4 yr after establishment, with the response deviating from linearity because of greater mortality at high rates.
- Taxon
- Medicago sativaMedicago sativae1
- Treatment
- seeding ratee4
- Outcome
- Plant densitye4
- Qualifier
- deviate from linearitye4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e4“Plant density continued to be affected by seeding rate 4 yr after establishment, but greater mortality at high seeding rates caused the response to deviate from linearity”
Claim · model-written summary
Greater mortality occurred at high seeding rates.
- Taxon
- Medicago sativaMedicago sativae1
- Treatment
- high seeding ratese4
- Outcome
- mortalitye4
- Direction
- greatere4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e4“Plant density continued to be affected by seeding rate 4 yr after establishment, but greater mortality at high seeding rates caused the response to deviate from linearity”
Claim · model-written summary
Shoots per plant were negatively correlated with plant density (r = -0.73, P = 0.01).
- Taxon
- Medicago sativaMedicago sativae1
- Treatment
- plant densitye5
- Outcome
- Shoots per plante5
- Direction
- negatively correlatede5
- Value
- r = –0.73e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e5“Shoots per plant were negatively correlated with plant density ( r = –0.73, P = 0.01)”
Claim · model-written summary
Shoot weight did not respond to seeding rate at Brookings.
- Taxon
- Medicago sativaMedicago sativae1
- Treatment
- seeding ratee6
- Outcome
- Shoot weighte6
- Direction
- did not responde6
- Setting
- Brookingse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e6“Shoot weight did not respond to seeding rate at Brookings but declined linearly with seeding rate at Highmore”
Claim · model-written summary
Shoot weight declined linearly with seeding rate at Highmore.
- Taxon
- Medicago sativaMedicago sativae1
- Treatment
- seeding ratee6
- Outcome
- Shoot weighte6
- Direction
- declined linearlye6
- Setting
- Highmoree6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e6“Shoot weight did not respond to seeding rate at Brookings but declined linearly with seeding rate at Highmore”
Claim · model-written summary
Leaf-to-stem ratio was not affected by seeding rate.
- Taxon
- Medicago sativaMedicago sativae1
- Treatment
- seeding ratee7
- Outcome
- Leaf‐to‐stem ratioe7
- Direction
- not affectede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e7“Leaf‐to‐stem ratio and shoot length were not affected by seeding rate”
Claim · model-written summary
Shoot length was not affected by seeding rate.
- Taxon
- Medicago sativaMedicago sativae1
- Treatment
- seeding ratee7
- Outcome
- shoot lengthe7
- Direction
- not affectede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e7“Leaf‐to‐stem ratio and shoot length were not affected by seeding rate”
Claim · model-written summary
Path analysis suggested that shoot weight was the major influence on alfalfa yield at both locations.
- Taxon
- Medicago sativaMedicago sativae1
- Outcome
- alfalfa yielde4
- Qualifier
- shoot weight was the major influencee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e4“path analysis suggested that shoot weight was the major influence on alfalfa yield at both locations”
Claim · model-written summary
Alfalfa yield components are affected similarly by plant density.
- Taxon
- Medicago sativaMedicago sativae1
- Treatment
- plant densitye5
- Outcome
- Alfalfa yield componentse5
- Direction
- affected similarlye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e5“Alfalfa yield components are affected similarly by plant density in seed‐established and transplanted stands”
Claim · model-written summary
Shoot weight may be affected by plant density because of differences in plant competition, even if yield is not.
- Taxon
- Medicago sativaMedicago sativae1
- Outcome
- shoot weighte6
- Qualifier
- differences in plant competitione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa ( Medicago sativa L.)”
e6“Although yield may not be affected by plant density, shoot weight may be affected because of differences in plant competition”
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