Intervention effectmodel-written summary

Spring glyphosate or paraquat did not increase alfalfa yield.

A claim from Downy Brome (Bromus tectorum) Control in Established Alfalfa (Medicago sativa) · 1997

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Spring glyphosate or paraquat did not increase alfalfa yield.

Taxon
AlfalfaMedicago sativat0
Treatment
spring applications of glyphosate or paraquate0
Outcome
Alfalfa yielde0
Direction
did not increasee0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Medicago sativa
Medicago sativa · TaxonDrepanostoma · CC BY 4.0 · iNaturalist ↗

Verbatim

e0

“Alfalfa yield did not increase following spring applications of glyphosate or paraquat”

✓ located verbatim in the source · abstract, characters 639–725
t0

“Alfalfa”

✓ located verbatim in the source · title, characters 53–60

Title

Downy Brome (Bromus tectorum) Control in Established Alfalfa (Medicago sativa)

Robert G. Wilson Weed Technology 1997. doi:10.1017/s0890037x00042950

Other claims from this paper (5)

Record rev-d26d2e42b6ca006e2170f9e20496b5a50113397705fd15d8a7ab006cf82a0526 · schema claims-v0.9 · position 6 in the model’s answer

paraquat · yield · Medicago sativa (alfalfa)Results differ

11 papers: 4 positive, 7 negative or no effect

6 papers in the same direction as this claim · 4 in the opposite direction

  1. positive
    Pronamide followed by paraquat increased alfalfa yield relative to pronamide alone.

    Fall and Spring Herbicide Treatment for Minimum-Tillage Seeding of Alfalfa (Medicago sativa) · 1983 · compared with pronamide alone

    Opposite direction

  2. positive
    No-till establishment with paraquat produced alfalfa yields equivalent to or better than conventional sowing, except on 2 April.

    Alfalfa establishment without tillage as influenced by insecticide and vegetation suppression · 1985 · compared with conventional sowings

    Opposite direction

  3. positive
    Alfalfa yields in two harvests after between-cutting paraquat treatment increased by 2.40 Mg ha -1 compared with nontreated weedy plots.

    Alfalfa Yield Response to a Between‐Cutting Contact Herbicide1 · 1984 · compared with nontreated weedy plots

    Opposite direction

  4. positive
    Split paraquat tended to increase yields in both harvest years relative to other treatments, though not always significantly.

    No‐Till Alfalfa Planting in Late Winter Following Fall Vegetation Suppression with Herbicides · 1989 · compared with other treatments

    Opposite direction

  5. negative
    Paraquat applied later than recommended after cutting reduced alfalfa yield in one experiment.

    Annual Grass Control in Alfalfa (Medicago sativa) with Postemergence Graminicides · 1992

    Same direction

  6. negative
    Paraquat reduced first harvest total forage yield of alfalfa by 20 to 33% compared with untreated alfalfa.

    Influence of Oat (Avena sativa) Interseeding on Weed Suppression in the Final Year of an Alfalfa (Medicago sativa) Stand · 1999 · compared with untreated alfalfa

    Same direction

  7. negative
    Paraquat applied 14 days after first harvest reduced alfalfa yield by 40%.

    Paraquat for Managing Weeds in Alfalfa (Medicago sativa) · 1991

    Same direction

  8. no effect
    After-cutting paraquat did not affect alfalfa yield in most experiments.

    Effects of Paraquat on Weed Control and Yield of Alfalfa (Medicago sativa) in Virginia · 1993

    Same direction

2 papers more in this group

See all 11 papers →

glyphosate · yield · Medicago sativa (alfalfa)Results differ

19 papers: 9 positive, 10 negative or no effect

9 papers in the same direction as this claim · 9 in the opposite direction

  1. negative
    Chlorimuron, flumetsulam and glyphosate decreased alfalfa yields.

    Weed Control in Established Alfalfa (Medicago sativa) with Postemergence Herbicides1 · 2001

    Same directionCites this paper

  2. no effect
    A high glyphosate dose of 9 lb a.e./acre over three years caused no reduction in alfalfa yield or nutritive value at any cutting.

    Evaluating Glyphosate Treatments on Roundup Ready Alfalfa for Crop Injury and Feed Quality · 2007

    Same directionCites this paper

  3. positive
    Glyphosate produced similar or higher annual yields than other herbicide programs.

    Influence of Seeding Rate and Herbicide Treatments on Weed Control, Yield, and Quality of Spring‐Seeded Glyphosate‐Resistant Alfalfa · 2010 · compared with other herbicide programs

    Opposite direction

  4. positive
    Two-trifoliate glyphosate produced greater seasonal yield than imazamox or imazethapyr plus bromoxynil.

    Evaluation of Glyphosate-Tolerant and Conventional Alfalfa Weed Control Systems during the First Year of Establishment · 2009 · compared with imazamox or imazethapyr in combination with bromoxynil

    Opposite direction

  5. positive
    Alfalfa yield was 1973 kg ha −1 after glyphosate versus 1287 kg ha −1 without suppression.

    Effect of vegetation suppression on the establishment of sod-seeded alfalfa in the Aspen Parkland · 1992 · compared with no suppression of the resident vegetation

    Opposite direction

  6. positive
    Alfalfa yield was greater when weeds were removed with glyphosate.

    Effect of Seeding Rate and Weed Control on Glyphosate-Resistant Alfalfa Establishment · 2011

    Opposite direction

  7. positive
    Complete glyphosate control of vegetation sustained alfalfa productivity throughout the experiment.

    Herbicides for Sod-Seeding Establishment of Alfalfa (Medicago sativa) in Quackgrass (Agropyron repens)-Infested Alfalfa Swards · 1985

    Opposite direction

  8. positive
    Cumulative alfalfa yield was greater with glyphosate than with non-glyphosate herbicide.

    The Effects of Seeding Rate on Older Stands of Glyphosate‐Tolerant Alfalfa · 2012 · compared with non‐glyphosate

    Opposite direction

10 papers more in this group

See all 19 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.