Intervention effectmodel-written summary

Continuous corn required at least 180 kg N ha −1 for maximum yield.

A claim from Crop Yield as Affected by Rotation and Nitrogen Rate. III. Corn · 1989

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Continuous corn required at least 180 kg N ha −1 for maximum yield.

Treatment
at least 180 kg N ha −1e0
Outcome
yielde0
Direction
maximume0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier

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

Zea mays subsp. mays
Zea mays subsp. mays · TaxonDominicus Johannes Bergsma · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“continuous corn required at least 180 kg N ha −1 for maximum yield”

✓ located verbatim in the source · abstract, characters 895–961

Title

Crop Yield as Affected by Rotation and Nitrogen Rate. III. Corn

Todd Andrews Peterson; G. E. Varvel Agronomy Journal 1989. doi:10.2134/agronj1989.00021962008100050007x

Other claims from this paper (6)

Record rev-4fa75bef6184d5bf41adc3f3cd9e1065df1316852604ce6534aa411e3883177e · schema claims-v0.9 · position 4 in the model’s answer

nitrogen · yield · Zea mays (maize)Positive and negative results

2,185 papers: 1,906 positive, 279 negative or no effect

1,905 papers in the same direction as this claim · 234 in the opposite direction · 45 reporting no difference from an alternative

  1. no effect
    Starter nitrogen did not increase corn yield.

    Can Management Practices Enhance Corn Productivity in a Rye Cover Crop System? · 2019 · compared with no starter

    Opposite directionCites this paper

  2. positive
    N application raised corn biomass production by 22%.

    Corn Response to Nitrogen Rate, Row Spacing, and Plant Density in Eastern Nebraska · 2006

    Same directionCites this paper

  3. positive
    No nitrogen input reduced yield in monoculture and two-year rotation but not four-year rotation.

    Crop Rotation and Nitrogen Input Effects on Soil Fertility, Maize Mineral Nutrition, Yield, and Seed Composition · 2009

    Same directionCites this paperAbout lacking this nutrient, so it counts the other way round

  4. positive
    PCU had a corn yield advantage over urea in two of three continuous-corn years below maximum-yield N rates.

    Nitrogen Source and Rate Effects on Irrigated Corn Yields and Nitrogen‐Use Efficiency · 2013 · compared with urea

    Same directionCites this paper

  5. positive
    Fertilizer N at 100 kg N ha -1 increased maize grain yield 19% over unfertilized treatment.

    Crop rotation and soil N amendment effects on maize production in eastern Canada · 2003 · compared with unfertilized treatment

    Same directionCites this paper

  6. positive
    Adding 160 lb N/acre compensated for the second-year previous-crop advantage.

    Rotational vs. Nitrogen‐Fixing Influence of Soybean on Corn Grain and Silage Yield and Nitrogen Use · 1999 · compared with previous crop advantage

    Same directionCites this paper

  7. negative
    Low nitrogen decreased maize grain yield.

    Within-Leaf Nitrogen Allocation in Adaptation to Low Nitrogen Supply in Maize during Grain-Filling Stage · 2016

    Opposite direction

  8. no effect
    Nitrogen timing did not affect corn production in the other two years.

    Corn Production as Affected by Nitrogen Application Timing and Tillage · 2004

    Opposite direction

2,176 papers more in this group

See all 2,185 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.