Intervention effectmodel-written summary

Nitrogen and potassium fertilizer increased tomato yield significantly.

A claim from Nitrogen and Potassium Fertilizers Increase Cherry Tomato Height and Yield · 2019

Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Nitrogen and potassium fertilizer increased tomato yield significantly.

Treatment
nitrogen and potassium fertilizer applicatione0
Outcome
yielde0
Direction
increasinge0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier

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

Solanum lycopersicum
Solanum lycopersicum · TaxonKod B · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“tomato plants significantly (P < 0.05) responded to nitrogen and potassium fertilizer application by increasing their height and yield”

✓ located verbatim in the source · abstract, characters 556–690

Title

Nitrogen and Potassium Fertilizers Increase Cherry Tomato Height and Yield

G. Ddamulira; R. Idd; S. Namazzi; et al. Journal of Agricultural Science 2019. doi:10.5539/jas.v11n13p48

Other claims from this paper (8)

Record rev-e3579384cc3293a7d7e321aa9ae3d43d20c9aba7c83c244b88c5cbc1a7f47326 · schema claims-v0.9 · position 2 in the model’s answer

nitrogen · yield · Solanum lycopersicum (tomato)Positive and negative results

210 papers: 172 positive, 38 negative or no effect

171 papers in the same direction as this claim · 31 in the opposite direction · 7 reporting no difference from an alternative

  1. positive
    Nitrogen fertilizer increased tomato length, yield, and nutrient content significantly.

    Influences of nitrogen and potassium fertilizer rates on pepper and tomato yield and nutrient uptake under field conditions · 2013

    Same directionCited by this paper

  2. negative
    Lower nitrogen supply reduced tomato commercial fruit yield by 7.5%.

    Effects of Low Nitrogen Supply on Tomato (Solanum lycopersicum) Fruit Yield and Quality with Special Emphasis on Sugars, Acids, Ascorbate, Carotenoids, and Phenolic Compounds · 2009

    Opposite direction

  3. negative
    Higher ammonium severely curtailed fruit yield.

    Effects of ammonium and inorganic carbon enrichment on growth and yield of a hydroponic tomato crop · 2002

    Opposite direction

  4. negative
    Lower nitrogen supply reduced tomato fruit number.

    Interactive Effects of Elevated CO2 and N Fertilization on Yield and Quality of Tomato Grown Under Reduced Irrigation Regimes · 2018

    Opposite direction

  5. negative
    Foliar ammonium restricted tomato yield.

    Tomato growth responses to foliar application of ammonium sulfate in hydroponic culture · 2016

    Opposite direction

  6. negative
    Six weeks of nitrogen deprivation reduced commercial fruit yield from 9.3 to 7.7 kg m −2.

    Growth and Nitrogen Status of Soilless Tomato Plants Following Nitrate Withdrawal from the Nutrient Solution · 2001 · compared with control plants

    Opposite direction

  7. no effect
    N, K and Ca limitation did not affect Micro-Tom fruit yield.

    Metabolite profile of the tomato dwarf cultivar Micro‐Tom and comparative response to saline and nutritional stresses with regard to a commercial cultivar · 2015

    Opposite direction

  8. negative
    Ammonium nutrition reduced shoot growth, total and mean fruit weight, and fruit number relative to nitrate nutrition.

    Effects of Nitrogen Form and Level on Ion Concentrations, Water Stress, and Blossom-end Rot Incidence in Tomato1 · 1978 · compared with NO 3 –N nutrition

    Opposite direction

201 papers more in this group

See all 210 papers →

fertilization · yield · Solanum lycopersicum (tomato)Positive and negative results

978 papers: 850 positive, 128 negative or no effect

849 papers in the same direction as this claim · 104 in the opposite direction · 24 reporting no difference from an alternative

  1. positive
    Nitrogen fertilizer increased tomato length, yield, and nutrient content significantly.

    Influences of nitrogen and potassium fertilizer rates on pepper and tomato yield and nutrient uptake under field conditions · 2013

    Same directionCited by this paper

  2. positive
    Striped German tomato yield increased 234% at 1.32 g/L NPK fertilizer compared with untreated plants.

    Growth Responses of Two Tomato Varieties to Varying NPK Fertilizer Concentration in a Controlled Environment · 2025 · compared with untreated plants

    Same directionCites this paper

  3. positive
    The 74% soil, 20% vermicompost and 6% biochar medium gave fruit yield.

    Synergistic effects of vermicompost and biochar amendments on cherry tomato production in an urban rooftop garden: A 2‐year study · 2026

    Same directionCites this paper

  4. no effect
    Reduced chemical fertilizer plus bio-organic fertilizer maintained tomato yields equivalent to full chemical fertilizer in pot and field trials.

    Bio-organic fertilizer with reduced rates of chemical fertilization improves soil fertility and enhances tomato yield and quality · 2020 · compared with 100% of the chemical fertilizer

    Opposite direction

  5. negative
    Yields of tomato, cucumber and sweet pepper decreased as EC of the nutrient solution increased.

    Sodium chloride salinity in fruit vegetable crops in soilless culture. · 1991

    Opposite direction

  6. negative
    Prolonged NFT solution recycling reduced tomato fresh and dry weight and yield versus regular renewal.

    Growth, Productivity, and Mineral Composition of Hydroponically Cultivated Greenhouse Tomatoes, with or without Nutrient Solution Recycling · 1996 · compared with plants grown in NFT with regular renewal of the nutrient solution

    Opposite direction

  7. negative
    Organic fertilizer gave significantly lower red tomato yields than mineral fertilizer.

    Impact of organic and inorganic fertilizers on yield, taste, and nutritional quality of tomatoes · 2006 · compared with mineral fertilizer

    Opposite direction

  8. negative
    Fruit number declined with chromium.

    Effects of chromium on the nutrient element content and morphology of tomato · 1995

    Opposite direction

969 papers more in this group

See all 978 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.