Intervention effectmodel-written summary

Increasing nitrogen improved onion pungency, reaching 2.72 µmol ml-1 at 138 kg N ha-1.

A claim from Growth, bulb yield and quality of onion (Allium cepa L.) as influenced by nitrogen and phosphorus fertilization on vertisol. II: Bulb quality and storability · 2012

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Increasing nitrogen improved onion pungency, reaching 2.72 µmol ml-1 at 138 kg N ha-1.

Taxon
onion (Allium cepa L.)Allium cepat0
Treatment
138 kg N ha-1e0
Outcome
Pungency measured as pyruvate concentratione0
Direction
improvede0
Value
2.72 µmol ml-1e0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingQualifier

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

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Pungency measured as pyruvate concentration improved with increase in the rate of N application and reached the highest value of 2.72 µmol ml-1 at a rate of 138 kg N ha-1.”

✓ located verbatim in the source · abstract, characters 503–674
t0

“onion (Allium cepa L.)”

✓ located verbatim in the source · title, characters 34–56

Title

Growth, bulb yield and quality of onion (Allium cepa L.) as influenced by nitrogen and phosphorus fertilization on vertisol. II: Bulb quality and storability

Tekalign T; Abdissa Y; M Pant L African Journal of Agricultural Research 2012. doi:10.5897/ajar10.1025

Other claims from this paper (10)

Record rev-cc662dd4df2d6bd8e4339c04bcb9d4255e42b98ec0acb169e5b286238868ea76 · schema claims-v0.9 · position 2 in the model’s answer

nitrogen · molecular: metabolites · Allium cepa (onion)Positive and negative results

8 papers: 6 positive, 2 negative or no effect

5 papers in the same direction as this claim · 2 in the opposite direction

  1. negative
    The 60% CPE plus 75 kg/ha nitrogen treatment produced minimum nutrient contents in onion bulbs and leaves.

    Nutritional quality of onion as influenced by irrigation scheduling and nitrogen fertigation · 2020

    Opposite direction

  2. negative
    Excessive N supply decreased spring onion concentration of organo-sulfur compounds.

    Effect of N and S supply on growth and organo-sulfur compounds of Zhangqiu spring onion. · 2009

    Opposite direction

  3. positive
    Metosulam plus urea ranked after Metosulam at 40 ml for broadleaved weed control.

    Effect of Adding Urea or Ammonium Sulphate on some Herbicides Efficiency in Controlling Weeds in Onion Plants · 2010

    Same direction

  4. positive
    Nitrogen at 120 kg/ha maximized total soluble solids and pyruvic acid content.

    Effect of different doses of nitrogen and sulphur on growth, yield and quality of onion (Allium cepa) · 2014

    Same direction

  5. positive
    Nitrogen and sulphur sources significantly affected nitrate content in bulbs and leaves.

    EFFECT OF SOME NITROGEN AND SULPHUR SOURCES ON PLANT GROWTH AND YIELD OF ONION (ALLIUM CEPA, L.) · 2000

    Same direction

  6. positive
    Urea with foliar 1% ZnSO4 gave the highest zinc content in onion (44.5 and 46 ppm)

    Effete of Nitrogen Forms and Zinc Levels on Yield, Quality of Onion (Allium cepa L.) and Soil Fertility · 2025

    Same direction

  7. positive
    T 6 gave improved cation exchange capacity at 11.433 ± 0.968 meq/100 g soil.

    Coupling of irrigation depth and nitrogen rates on onion (Allium cepa L.) yield and irrigation water productivity in Northern Ethiopia · 2026

    Same direction

See all 8 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.