Intervention effectmodel-written summary

Marketable yield of onion was highest (20.8 ha-1) at 105:119.6:22 kg ha-1 N:P2O5:S in the Adama Red variety.

A claim from Optimum rate of NPS fertilizer for economical production of irrigated onion (Allium cepa L) in Dembyia District of Amhara Region, Ethiopia · 2019

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Marketable yield of onion was highest (20.8 ha-1) at 105:119.6:22 kg ha-1 N:P2O5:S in the Adama Red variety.

Taxon
OnionAllium cepae4
Material
Adama Rede5
Treatment
105:119.6:22 kg ha-1 N:P2O5:S fertilizer ratee4
Outcome
marketable yielde4
Direction
higheste4
Value
20.8 ha-1e4

Not reportedGeneCompoundOrgan / 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

e4

“Onion plants supplied with 105:119.6:22 kg ha-1 N:P2O5:S fertilizer rate gave the highest mean bulb weight (198.8 g), marketable yield (20.8 ha-1) and total bulb yield (21.4 t ha-1)”

✓ located verbatim in the source · abstract, characters 1158–1339
e5

“where maximum yield of Adama Red onion variety can be obtained”

✓ located verbatim in the source · abstract, characters 693–755

Title

Optimum rate of NPS fertilizer for economical production of irrigated onion (Allium cepa L) in Dembyia District of Amhara Region, Ethiopia

Muluneh Nigatu; Melkamu Alemayehu; Amare Haile Sellassie Ethiopian Journal of Science and Technology 2019. doi:10.4314/ejst.v11i2.3

Other claims from this paper (9)

Record rev-2ddfd424b56f48560f0c8dea52a80941e0179fb3b3c4c43b0a255e441b0eb63b · schema claims-v0.9 · position 5 in the model’s answer

sulfur atom · quality: postharvest · Allium cepa (onion)Results differ

11 papers: 9 positive, 2 negative or no effect

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

  1. no effect
    Sulfur fertilization had little effect on onion storage-life.

    SULFUR FERTILIZATION AFFECTS ONION QUALITY AND FLAVOR CHEMISTRY DURING STORAGE · 2010

    Opposite direction

  2. no effect
    K/S rate did not affect the marketable and total number and weight of onion bulbs.

    Sweet Onion (Allium cepa) Plant Growth and Bulb Yield and Quality as Affected by Potassium and Sulfur Fertilization Rates · 2016

    Opposite direction

  3. positive
    Sulphur application enhanced the storability of onion bulbs.

    Impacts of sulphur levels on yield, storability and economic return of onion · 1970

    Same direction

  4. positive
    Sulphur application increased marketable onion bulb yield over no sulphur.

    Effect of sulphur nutrition on pungency and storage life of short day onion (Allium cepa) · 2013 · compared with no sulphur treatment

    Same direction

  5. positive
    Application of sulphur at 45 kg ha-1 improved onion bulb storage life.

    Effect of Sources and Levels of Sulphur on Growth, Yield and Quality of Onion (Allium cepa L.) · 2019

    Same direction

  6. positive
    Marketable onion bulb yield reached 250.33 q ha-1 under the best dose versus 158.00 q ha-1 in control.

    Growth and yield of bulbs of onion (Allium cepa L.) as influenced by different levels of nitrogen, phosphorous, potassium and sulphur · 2018 · compared with control

    Same direction

  7. positive
    sprouting loss was minimized under combined application.

    Influence of sulphur, zinc and boron on growth, yield and quality of onion · 2017

    Same direction

  8. positive
    The same P2S1 treatment gave better (lower) physiological weight loss of onion bulbs in storage.

    Effect of potash and sulphur levels on growth, yield, quality parameters and economics in onion · 2024

    Same direction

2 papers more in this group

See all 11 papers →

fertilization · quality: postharvest · Allium cepa (onion)Positive and negative results

69 papers: 53 positive, 16 negative or no effect

52 papers in the same direction as this claim · 15 in the opposite direction · 1 reporting no difference from an alternative

  1. positive
    The 244 kg·ha −1 NPSB and 7.5 cm spacing combination produced the highest marketable yield in 2022, 41.2 t ha −1.

    Evaluation of the Impact of Combined Application of Inorganic Fertilizer and Plant Spacing on Onion ( Allium cepa L.) Production Under Irrigation Conditions in Central Ethiopia, Ethiopia · 2025

    Same directionCites this paper

  2. negative
    The highest phosphorus level caused the greatest cumulative bulb weight loss over eight weeks.

    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

    Opposite direction

  3. negative
    Nitrogen fertilization increased bulb weight loss during storage across cultivars.

    Shallot Yield, Quality and Shelf-life as Affected by Nitrogen Fertilizer · 2014

    Opposite direction

  4. no effect
    Sulfur fertilization had little effect on onion storage-life.

    SULFUR FERTILIZATION AFFECTS ONION QUALITY AND FLAVOR CHEMISTRY DURING STORAGE · 2010

    Opposite direction

  5. negative
    MOP gave significantly highest sprouting in room and cold storage.

    INFLUENCE OF DIFFERENT LEVELS OF POTASH ON THE QUANTITY, QUALITY AND STORAGE LIFE OF ONION BULBS · 2010

    Opposite direction

  6. no effect
    Nitrogen fertilization had no significant effect on bulb storability.

    Shallot yield, quality and storability as affected by irrigation and nitrogen · 2003

    Opposite direction

  7. negative
    Nitrogen fertilizer reduced marketable bulb number.

    Response of Shallots to Mulching and Nitrogen Fertilization · 2003

    Opposite direction

  8. no effect
    Bulb weight loss, black mould and sprouting were generally unaffected by weed management and fertilizer levels.

    Performance of onion under weed and fertilizer management · 2012

    Opposite direction

60 papers more in this group

See all 69 papers →

phosphorus · quality: postharvest · Allium cepa (onion)Results agree

7 papers: 7 positive, 0 negative or no effect

6 papers in the same direction as this claim

  1. positive
    Eight-week-old transplants with 138 kg P2O5 ha-1 gave the highest marketable bulb yield, 48.33 t ha-1.

    Effects of seedling age and rates of phosphorus fertilizer on growth and yield performance of onion (Allium cepa L.) under irrigation at Alage, Central Rift Valley of Ethiopia · 2018

    Same direction

  2. positive
    Marketable onion bulb yield reached 250.33 q ha-1 under the best dose versus 158.00 q ha-1 in control.

    Growth and yield of bulbs of onion (Allium cepa L.) as influenced by different levels of nitrogen, phosphorous, potassium and sulphur · 2018 · compared with control

    Same direction

  3. positive
    Combining manure and phosphorus produced an economic benefit based on marketable bulb number and weight.

    Influence of fertilization on growth and yield of onion under semi-arid conditions · 2021

    Same direction

  4. positive
    The same P2S1 treatment gave better (lower) physiological weight loss of onion bulbs in storage.

    Effect of potash and sulphur levels on growth, yield, quality parameters and economics in onion · 2024

    Same direction

  5. positive
    Marketable onion bulbs were higher under the combined treatment, at 58.23%.

    Effect of nutrient sources on shelf life of onion (Alluim cepa L.) Cv. Bellary red · 2014 · compared with rest ofthe treatments

    Same direction

  6. positive
    The 84 kg N plus 76 kg P2O5 plus 14 kg sulfur and 7.5 t organic treatment had superior marketable yield of 15.1 t/ha.

    Effects of Combined NPS Fertilizer and Goat Dung on Onion (Allium cepa L.) Growth and Yield in the Tanqua Abergelle District, Ethiopia · 2025

    Same direction

See all 7 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.