Abstract
Published intervals for avoiding autotoxicity when reseeding alfalfa ( Medicago sativa L.) after alfalfa range from 2 wk to more than 1 yr. Intervals between killing old alfalfa stands with herbicides and reseeding alfalfa were compared in field experiments established in 1992 (Locations 1 and 2) and 1993 (Location 3) near West Plains, MO. Soils were Poynor cherty silt loam (loamy‐skeletal over clayey, siliceous, mesic Typic Paleudult), Ashton silt loam (fine‐silty, mixed, mesic Mollic Hapludalf), and Waben very cherty silt loam (loamy‐skeletal, siliceous, mesic Ultic Hapludalf), respectively. Main plots were 18‐, 12‐, 6‐, 0.75‐, and 0.5‐mo rotation intervals before a common May planting date. Subplots were insecticide and fungicide treatments at planting. Insecticide or fungicide treatment did not affect plant density or yield during the establishment year or two subsequent years. Among years, plant densities for the 0.75‐ and 0.5‐mo rotation intervals ranged between 12 and 19.2% lower ( P < 0.05) than that of the 18‐mo control interval, and yields for the 6‐ and 0.5‐mo intervals ranged between 6.3 and 10.3% lower than that of the control ( P < 0.05). Although plant density of the 0.75‐mo rotation interval was lower, yield was similar to the 18‐mo control due to incomplete kill of old plants. Plant density and dry matter yield remained ranked according to rotation interval from the seeding year through the third year, suggesting an autoconditioning effect during establishment that was retained at the population level. A rotation interval of at least 12 mo is suggested before reseeding alfalfa after alfalfa in the lower Midwest.
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Claims 7
Claim · model-written summary
Insecticide or fungicide treatment at planting did not affect alfalfa plant density or yield in the establishment year or two later years.
- Taxon
- alfalfa
Medicago sativae0 - Treatment
- Insecticide or fungicide treatmente1
- Outcome
- plant density or yielde1
- Direction
- did not affecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intervals between killing old alfalfa stands with herbicides and reseeding alfalfa were compared in field experiments established in 1992 (Locations 1 and 2) and 1993 (Location 3) near West Plains, MO”
e1“Insecticide or fungicide treatment did not affect plant density or yield during the establishment year or two subsequent years”
Claim · model-written summary
Alfalfa plant density at 0.75- and 0.5-month rotation intervals was 12 to 19.2% lower than at the 18-month control interval.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- 0.75‐ and 0.5‐mo rotation intervalse2
- Outcome
- plant densitiese2
- Direction
- lowere2
- Value
- 12 and 19.2%e2
- Comparator
- 18‐mo control intervale2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intervals between killing old alfalfa stands with herbicides and reseeding alfalfa were compared in field experiments established in 1992 (Locations 1 and 2) and 1993 (Location 3) near West Plains, MO”
e2“Among years, plant densities for the 0.75‐ and 0.5‐mo rotation intervals ranged between 12 and 19.2% lower ( P < 0.05) than that of the 18‐mo control interval”
Claim · model-written summary
Alfalfa yield at 6- and 0.5-month rotation intervals was 6.3 to 10.3% lower than the control.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- 6‐ and 0.5‐mo intervalse3
- Outcome
- yieldse3
- Direction
- lowere3
- Value
- 6.3 and 10.3%e3
- Comparator
- controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intervals between killing old alfalfa stands with herbicides and reseeding alfalfa were compared in field experiments established in 1992 (Locations 1 and 2) and 1993 (Location 3) near West Plains, MO”
e3“yields for the 6‐ and 0.5‐mo intervals ranged between 6.3 and 10.3% lower than that of the control ( P < 0.05)”
Claim · model-written summary
Yield at the 0.75-month rotation interval was similar to the 18-month control although plant density was lower, due to incomplete kill of old plants.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- 0.75‐mo rotation intervale4
- Outcome
- yielde4
- Direction
- similare4
- Qualifier
- due to incomplete kill of old plantse4
- Comparator
- 18‐mo controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intervals between killing old alfalfa stands with herbicides and reseeding alfalfa were compared in field experiments established in 1992 (Locations 1 and 2) and 1993 (Location 3) near West Plains, MO”
e4“Although plant density of the 0.75‐mo rotation interval was lower, yield was similar to the 18‐mo control due to incomplete kill of old plants”
Claim · model-written summary
Alfalfa plant density and dry matter yield stayed ranked by rotation interval from the seeding year through the third year.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- rotation intervale5
- Outcome
- Plant density and dry matter yielde5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intervals between killing old alfalfa stands with herbicides and reseeding alfalfa were compared in field experiments established in 1992 (Locations 1 and 2) and 1993 (Location 3) near West Plains, MO”
e5“Plant density and dry matter yield remained ranked according to rotation interval from the seeding year through the third year, suggesting an autoconditioning effect during establishment that was retained at the population level”
Claim · model-written summary
The authors suggest that the ranking by rotation interval reflects an autoconditioning effect during establishment retained at the population level.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- Plant density and dry matter yielde5
- Qualifier
- autoconditioning effecte5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intervals between killing old alfalfa stands with herbicides and reseeding alfalfa were compared in field experiments established in 1992 (Locations 1 and 2) and 1993 (Location 3) near West Plains, MO”
e5“Plant density and dry matter yield remained ranked according to rotation interval from the seeding year through the third year, suggesting an autoconditioning effect during establishment that was retained at the population level”
Claim · model-written summary
A rotation interval of at least 12 months is suggested before reseeding alfalfa after alfalfa in the lower Midwest.
- Taxon
- alfalfaMedicago sativae6
- Outcome
- rotation interval of at least 12 moe6
- Setting
- lower Midweste6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“A rotation interval of at least 12 mo is suggested before reseeding alfalfa after alfalfa in the lower Midwest”
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