Intervention effectmodel-written summary

On non-fruiting vines supplied with 40 to 80 ppm nitrogen, a potassium to nitrogen ratio of half to quarter was best for shoot and root growth.

A claim from Growth and yield of grapes as related to the concentrations of nitrogen, phosphoric acid and potassium in sand culture. (II) · 1957

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

On non-fruiting vines supplied with 40 to 80 ppm nitrogen, a potassium to nitrogen ratio of half to quarter was best for shoot and root growth.

Taxon
grapest0
Treatment
ratio of potassium to nitrogen as half to quartere0
Outcome
shoot and root growthe0
Direction
beste0
Qualifier
non-fruiting vinese0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValue

Verbatim

e0

“On non-fruiting vines, when the nitrogen was supplied in proper concentration such as 40 to 80ppm, the ratio of potassium to nitrogen as half to quarter was the best for shoot and root growth”

✓ located verbatim in the source · abstract, characters 238–429
t0

“grapes”

✓ located verbatim in the source · title, characters 20–26

Title

Growth and yield of grapes as related to the concentrations of nitrogen, phosphoric acid and potassium in sand culture. (II)

A. KOBAYASHI; T. HOSOI; H. INOUE Journal of the Japanese Society for Horticultural Science 1957. doi:10.2503/jjshs.26.73

Other claims from this paper (5)

Record rev-e62e617597d240b7d3a5d19b39008ae6de95177f6b0fc1e52460a3f563de39fd · schema claims-v0.9 · position 1 in the model’s answer

potassium · growth · VitisPositive and negative results

13 papers: 8 positive, 5 negative or no effect

7 papers in the same direction as this claim · 5 in the opposite direction

  1. no effect
    2% potassium chlorate had no observed effect on dormancy release.

    Effects of Various Chemicals and their concentrations on breaking bud dormancy in grapevines · 2007

    Opposite direction

  2. no effect
    P, K and S produced no growth response.

    Effect of Soil-applied Macro- and Micro-nutrients on the Yield and Quality of ‘Concord’ Grapes · 1987

    Opposite direction

  3. no effect
    Potassium did not significantly affect root growth.

    Modeling Alleviative Effects of Ca, Mg, and K on Cu-Induced Oxidative Stress in Grapevine Roots Grown Hydroponically · 2021

    Opposite direction

  4. no effect
    Potassium and iron fertilization sources and foliar treatment did not change leaf phosphorus percentage

    GRAPEVINE FE-CHLOROSIS ON PODUNAVLJE VINEGROWING AREA · 2012

    Opposite direction

  5. negative
    Low K reduced leaf area index in Early Sweet.

    Effect of Potassium Availability on Growth, Leaf Nutrient Contents, Yield, and Fruit Quality of Table Grapes · 2026

    Opposite direction

  6. positive
    Grapevine fertilizer result: vine growth.

    Response Surface Studies on the Effects of N, P and K Fertilizers on Vine Growth, Yield and Fruit Quality · 1978

    Same direction

  7. positive
    Potassium silicate produced the highest shoot dry weight of 0.026 g.

    Effect of Different Silicone Sources and Concentrations on in vitro Micro Propagation of 140 Ru Grape Rootstock · 2021

    Same direction

  8. positive
    Five percent potassium silicate increased leaf area.

    Influence of Spraying Kaolin and Potassium Silicate on Quality, Storability and Fungal Diseases Control of “King Roby” Grapevine · 2024

    Same direction

4 papers more in this group

See all 13 papers →

nitrogen · growth · VitisPositive and negative results

21 papers: 17 positive, 4 negative or no effect

16 papers in the same direction as this claim · 3 in the opposite direction · 1 reporting no difference from an alternative

  1. no effect
    Shoot growth did not differ significantly under short-term nitrogen deficiency.

    A New Strategy to Improve Vineyard Resilience: Grapevine Morphological Adaptation to Short-Term Nitrogen Deficiency · 2022

    Opposite directionAbout lacking this nutrient, so it counts the other way round

  2. no effect
    Increasing soil-applied nitrogen up to 134.4 kg/ha had no effect on growth or cropping of Concord.

    Root Pruning Has Little Effect on Seyval, Catawba or Concord Grapevines · 2001

    Opposite direction

  3. negative
    Vine growth in the ammonium series decreased at pH 4 and 5 compared with pH 6, 7 and 8.

    Nutritional and physiological studies on grapevine. IV · 1961 · compared with pH 6, 7, and 8

    Opposite direction

  4. no effect
    Grape pollen stored in liquid nitrogen showed no significant decrease in germination after 64 weeks.

    Cryogenic preservation of grape (Vitis vinifera L.) pollen · 2015 · compared with pollen stored under laboratory conditions

    No difference from an alternative

  5. positive
    High nitrogen stimulated shoot growth and leaf area expansion.

    Interaction of Nitrogen Availability During Bloom and Light Intensity During Veraison. I. Effects on Grapevine Growth, Fruit Development, and Ripening · 1998

    Same direction

  6. positive
    High soil nitrogen increased leaf area through lateral shoot growth.

    Soil nitrogen utilisation for growth and gas exchange by grapevines in response to nitrogen supply and rootstock · 2001

    Same direction

  7. positive
    Low N before veraison favoured fruit development at the expense of root growth.

    Carbon and nitrogen partitioning in either fruiting or non-fruiting grapevines: effects of nitrogen limitation before and after veraison · 2002

    Same directionAbout lacking this nutrient, so it counts the other way round

  8. positive
    Single berries were bigger in size and weight under high N.

    Effect of nitrogen and potassium fertilization on productivity and fruit quality of ‘crimson seedless’ grape · 2011

    Same direction

12 papers more in this group

See all 21 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.