Intervention effectmodel-written summary

The 100% urea variant gave the highest average potato yield, 40.95 t/ha, significantly above the other fertilisation variants.

A claim from The effect of urea with urease inhibitors and urea on yield and nitrate content in potato tubers · 2013

Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

The 100% urea variant gave the highest average potato yield, 40.95 t/ha, significantly above the other fertilisation variants.

Treatment
100% of ureae0
Outcome
average yielde0
Direction
higheste0
Value
40.95 t.ha-1e0
Comparator
other variants of fertilizatione0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingQualifier

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

Solanum tuberosum
Solanum tuberosum · TaxonScott Bauer, USDA ARS · Public domain · Wikimedia Commons ↗

Verbatim

e0

“The obtained results show that the highest average yield has been achieved in the variant of 100% of urea - 40.95 t.ha-1, the yield of this variant was statistically significantly higher than the yield of the other variants of fertilization (P < 0.05)”

✓ located verbatim in the source · abstract, characters 785–1036
t0

“nitrate content in potato tubers”

✓ located verbatim in the source · title, characters 64–96

Title

The effect of urea with urease inhibitors and urea on yield and nitrate content in potato tubers

Karel Drápal; Miroslav Jůzl; Petr Elzner; et al. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 2013. doi:10.11118/actaun201361061613

Other claims from this paper (8)

Record rev-0dfab554df5d559579043ddb64d182615c97eca6c6d987c4c8876b4d78e954f8 · schema claims-v0.9 · position 1 in the model’s answer

nitrogen · yield · Solanum tuberosum (potato)Results differ

132 papers: 109 positive, 23 negative or no effect

108 papers in the same direction as this claim · 20 in the opposite direction · 3 reporting no difference from an alternative

  1. no effect
    PCU and soluble nitrogen at equivalent rates yielded similarly in total and grade A tubers.

    Potato Response to a Polymer‐Coated Urea on an Irrigated, Coarse‐Textured Soil · 2009 · compared with soluble N

    Opposite direction

  2. negative
    Under dry soil conditions, split nitrogen application reduced tuber yield and size.

    Rate and timing of nitrogen fertilization of Russet Burbank potato: Yield and processing quality · 2004

    Opposite direction

  3. negative
    Variable-rate nitrogen application was unprofitable for the field compared with uniform nitrogen application.

    ECONOMIC AND ENVIRONMENTAL FEASIBILITY OF VARIABLE RATE NITROGEN FERTILIZER APPLICATION WITH CARRY-OVER EFFECTS · 1998 · compared with uniform nitrogen application

    Opposite direction

  4. negative
    Inadequate nitrogen limited production of maize and potatoes after the first year.

    Pasture growth and soil fertility · 1965

    Opposite direction

  5. no effect
    Potato yield was similar between N rates applied at emergence, except one farm in 2010

    Nitrogen Fertilizer Rate and Application Timing for Chipping Potato Cultivar Atlantic · 2014

    Opposite direction

  6. no effect
    At soil nitrate-supplying power of at least 50 p.p.m. N, added nitrogen gave little or no potato yield increase.

    MEASUREMENT OF NITRATE-SUPPLYING POWER OF SOILS BY AN INCUBATION METHOD AND CORRELATION WITH CROP YIELD RESPONSE · 1958

    Opposite direction

  7. no effect
    Water supply and nitrogen source did not change potato harvest index, which varied between 0.7 and 0.8.

    Harvest index of potato crop grown under different nitrogen and water supply. · 2009

    Opposite direction

  8. negative
    Urea gave slightly smaller potato tuber yield increases than ammonium sulphate at 40–60 lb./acre.

    Field experiments on the value of urea as a fertilizer for barley, sugar beet, potatoes, winter wheat and grassland in Great Britain · 1963 · compared with ammonium sulphate

    Opposite direction

123 papers more in this group

See all 132 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.