Intervention effectmodel-written summary

Added P and K increased alfalfa yield each year.

A claim from Influence of Phosphorus and Potassium on Alfalfa Yield and Yield Components · 2005

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Added P and K increased alfalfa yield each year.

Taxon
alfalfaMedicago sativae0
Treatment
P and Ke0
Outcome
alfalfa yielde0
Direction
increasede0

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

“Incremental additions of P and K increased alfalfa yield in each year”

✓ located verbatim in the source · abstract, characters 932–1001

Title

Influence of Phosphorus and Potassium on Alfalfa Yield and Yield Components

W. K. Berg; S. M. Cunningham; S. M. Brouder; et al. Crop Science 2005. doi:10.2135/cropsci2005.0297

Other claims from this paper (4)

Record rev-f52dfdca4efbe2e05af4e6eeaa0693782b1cd2af9db18781870bb4899c09bf26 · schema claims-v0.9 · position 1 in the model’s answer

potassium · yield · Medicago sativa (alfalfa)Results differ

38 papers: 30 positive, 8 negative or no effect

29 papers in the same direction as this claim · 8 in the opposite direction

  1. no effect
    Variety and K rate did not significantly influence yield.

    Effect of Potassium Application Rate on Dry Matter Yield and Forage Nutritive Value in Alfalfa · 2022

    Opposite directionCites this paper

  2. positive
    Addition of P and K increased alfalfa forage yield each year compared with unfertilized plots.

    The Long‐Term Impact of Phosphorus and Potassium Fertilization on Alfalfa Yield and Yield Components · 2007 · compared with unfertilized plots

    Same directionCites this paper

  3. positive
    High potassium rates partly alleviated the adverse residual-yield effect of an October fourth cut.

    Effects of Potassium Topdressing a Low Fertility Silt Loam Soil on Alfalfa Herbage Yields and Composition and on Soil K Values1 · 1975

    Same directionCited by this paper

  4. positive
    High potassium consistently increased alfalfa yield.

    Potassium Nutrition Effects on Net Photosynthesis and Morphology of Alfalfa · 1967

    Same directionCited by this paper

  5. positive
    Phosphorus and potassium addition increased alfalfa forage yield.

    Influence of Phosphorus and Potassium on Alfalfa Yield, Taproot C and N Pools, and Transcript Levels of Key Genes after Defoliation · 2009

    Same directionCites this paper

  6. positive
    Combined NPK and combined NP fertilizer applications achieved the greatest alfalfa yield increase, 27.0%.

    Yield and quality of alfalfa (Medicago sativa L.) in response to fertilizer application in China: A meta-analysis · 2022 · compared with non-fertilizer control

    Same directionCites this paper

  7. positive
    K was associated with positive effect in alfalfa yield.

    Phosphorus and Potassium Fertilizer Effects on Alfalfa and Soil in a Non‐Limited Soil · 2013

    Same directionCites this paper

  8. positive
    Only fertilizer containing potash produced highly significant yield increases.

    The Effect of Time and Rate of Fertilizer Application on the Yield, Composition, and Longevity of Alfalfa · 1957

    Same directionCited by this paper

29 papers more in this group

See all 38 papers →

phosphorus · yield · Medicago sativa (alfalfa)Results differ

68 papers: 54 positive, 14 negative or no effect

53 papers in the same direction as this claim · 13 in the opposite direction · 1 reporting no difference from an alternative

  1. no effect
    N and P did not affect alfalfa yield.

    Soil and Plant Responses to Long‐Term Fertilization of Alfalfa (Medicago sativa L.)1 · 1965

    Opposite directionCited by this paper

  2. no effect
    P application was associated with no impact in alfalfa yield.

    Phosphorus and Potassium Fertilizer Effects on Alfalfa and Soil in a Non‐Limited Soil · 2013

    Opposite directionCites this paper

  3. positive
    Addition of P and K increased alfalfa forage yield each year compared with unfertilized plots.

    The Long‐Term Impact of Phosphorus and Potassium Fertilization on Alfalfa Yield and Yield Components · 2007 · compared with unfertilized plots

    Same directionCites this paper

  4. positive
    Phosphorus and potassium addition increased alfalfa forage yield.

    Influence of Phosphorus and Potassium on Alfalfa Yield, Taproot C and N Pools, and Transcript Levels of Key Genes after Defoliation · 2009

    Same directionCites this paper

  5. positive
    Combined NPK and combined NP fertilizer applications achieved the greatest alfalfa yield increase, 27.0%.

    Yield and quality of alfalfa (Medicago sativa L.) in response to fertilizer application in China: A meta-analysis · 2022 · compared with non-fertilizer control

    Same directionCites this paper

  6. positive
    Cumulative dry matter yield was 7.78 Mg ha–1 higher with P than CK.

    Influence of 24 annual applications of fertilisers and/or manure to alfalfa on forage yield and some soil properties under dryland conditions in northern China · 2011 · compared with CK treatment

    Same directionCites this paper

  7. positive
    Combined P, K, S and Zn application significantly increased lucerne herbage yield by 139% over 2 years.

    Fertiliser management for higher productivity of established lucerne pasture · 2010

    Same directionCites this paper

  8. positive
    In Shandong, Jilin and Hebei, alfalfa yield improved after applying calcium phosphate or single superphosphate at 100–200 kg·ha−1 where soil pH is 7–8.

    Optimizing Phosphorus Fertilization Management Is Conducive to Improving Alfalfa Yield and Quality: A Meta-Analysis · 2025

    Same directionCites this paper

59 papers more in this group

See all 68 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.