Intervention effectmodel-written summary

Nitrogen fertilization had no significant effect on bulb yield.

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

Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Taxon: shallotAllium cepa var. aggregatumt0
Treatment: nitrogen fertilizatione0
Outcome: yielde0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingDirectionValueQualifier

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

*Allium cepa var. aggregatum* · TaxonEvan-Amos · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0
“No significant effects were observed on the yield, dry matter, soluble solids and storability of bulbs due to the nitrogen fertilization.”
✓ located verbatim in the source · abstract, characters 1138–1275

t0
“Shallot yield”
✓ located verbatim in the source · title, characters 0–13

Title

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

K. Woldetsadik; U. Gertsson; J. Ascard The Journal of Horticultural Science and Biotechnology 2003. doi:10.1080/14620316.2003.11511661

Other claims from this paper (15)

Intervention effect At 75% available soil moisture, both shallot cultivars had higher bulb yield than at 50% or 25%.
Intervention effect At 75% available soil moisture, both shallot cultivars had higher mean bulb weight than at 50% or 25%.
Intervention effect DZ-sht-91 had the highest total bulb weight loss at 75% irrigation and the least at 25%.
Intervention effect DZ-sht-91 had the highest bulb rotting loss at 75% irrigation and the least at 25%.
Intervention effect Irrigation treatments did not affect storability of Fedis bulbs.
Intervention effect Irrigation at 50% available soil moisture gave the best irrigation water-use efficiency.
Intervention effect Nitrogen at 75 kg ha–1 increased bulb pyruvic acid content.
Intervention effect Nitrogen at 150 kg ha–1 increased bulb pyruvic acid content.
Intervention effect Nitrogen tended to increase mean bulb weight in Fedis.
Intervention effect Without nitrogen, DZ-sht-91 had heavier bulbs.
Intervention effect Nitrogen fertilization had no significant effect on bulb dry matter.
Intervention effect Nitrogen fertilization had no significant effect on bulb soluble solids.
Intervention effect Nitrogen fertilization had no significant effect on bulb storability.
Observation The study found no interaction effects between nitrogen and irrigation treatments.
Recommendation The authors suggest irrigation at 75% available soil moisture for shallots intended for immediate use.

Record rev-1210c19062b11fb84548ef92081ef447047abc298161743ac0af7eda30d03edc · schema claims-v0.9 · position 11 in the model’s answer

fertilization · yield · Allium cepa (onion)Positive and negative results

530 papers: 464 positive, 66 negative or no effect

65 papers in the same direction as this claim · 464 in the opposite direction

positive
High fertilisation increased yield only in 1996, by the reported 5B7%.
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Opposite directionCited by this paper
positive
Bulb yield of shallot was significantly increased by nitrogen fertilization up to 150 kg ha−1 in the main rainy season of 2000 when supplemental irrigation was applied.
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Opposite directionCited by this paper
positive
Water soluble fertilizer sources improved onion dry matter, bulb weight and green leaves weight.
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Opposite directionCites this paper
positive
Poultry manure at 15 t ha-1 produced the highest total onion bulb yield, 63.33 t ha-1.
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Opposite directionCites this paper
positive
N fertilization increased bulb diameter by about 12.
Growth, bulb yield and quality of onion ( Allium cepa L.) as influenced by nitrogen and phosphorus fertilization on vertisol I. growth attributes, biomass production and bulb yield · 2011 · compared with control
Opposite direction
positive
Combined vermicompost and NPK increased onion vegetative and bulb growth.
Effects of combined application of vermicompost and mineral fertilizer on the growth of Allium cepa L. and soil fertility · 2011
Opposite direction
positive
N fertilization gave only a small increase in onion bulb yield because residual soil nitrate was high.
Nitrogen Fertilizer Use Efficiency of Furrow‐Irrigated Onion and Corn · 2002
Opposite direction
positive
The treatment increased shallot bulb yield versus other treatments.
Improvement of soil quality using bokashi composting and NPK fertilizer to increase shallot yield on dry land · 2018 · compared with other treatments
Opposite direction

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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.

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fertilization · yield · Allium cepa (onion)Positive and negative results