Intervention effectmodel-written summary

The variable yield goal zone strategy returned $18.21 to $29.57 per hectare more than uniform management.

A claim from Economic Feasibility of Variable‐Rate Nitrogen Application Utilizing Site‐Specific Management Zones · 2004

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

The variable yield goal zone strategy returned $18.21 to $29.57 per hectare more than uniform management.

Treatment
SSMZ‐VYG N management strategye0
Outcome
Net returnse0
Direction
moree0
Value
$18.21 to $29.57 ha −1e0
Comparator
uniform N managemente0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingQualifier

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

“Net returns from the SSMZ‐VYG N management strategy were $18.21 to $29.57 ha −1 more than uniform N management”

✓ located verbatim in the source · abstract, characters 1068–1178
t0

“corn ( Zea mays L.)”

✓ located verbatim in the source · abstract, characters 429–448

Title

Economic Feasibility of Variable‐Rate Nitrogen Application Utilizing Site‐Specific Management Zones

B. Koch; R. Khosla; W. M. Frasier; et al. Agronomy Journal 2004. doi:10.2134/agronj2004.1572

Other claims from this paper (2)

Record rev-e6f84234d7fb55f77cc393f3e246316a206dc4dee140630bf08a33b34376a597 · schema claims-v0.9 · position 2 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. positive
    Long-term return-maximizing rates improved net return for 33G26 by US$22 per hectare.

    Evaluating Management Zone Optimal Nitrogen Rates with a Crop Growth Model · 2006

    Same directionCites this paper

  2. positive
    Site-specific nitrogen management yielded 5.2 Mg/ha in site-year I, significantly higher than no nitrogen at 3.2 Mg/ha.

    Maize (Zea mays L.) Growth and Grain Yield under Conventional and Site-Specific Nitrogen Management in a Dryland Farming System · 2014 · compared with no N application

    Same directionCites this paper

  3. 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

  4. 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

  5. negative
    For the two years after 1992, losses were significantly higher for 134 kg N ha−1 on the clay loam.

    Nitrate Leaching and Nitrogen Budget as Affected by Maize Nitrogen Rate and Soil Type · 2000

    Opposite direction

  6. negative
    Nitrogen stress reduced kernel number of maize in field conditions.

    Nitrogen Deficiency in Maize: II. Carbon‐Nitrogen Interaction Effects on Kernel Number and Grain Yield · 1995

    Opposite direction

  7. no effect
    At high N rates, yields under the two tillage systems were approximately equal.

    Soil Nitrogen Availability after Long‐term Continuous No‐tillage and Conventional Tillage Corn Production · 1986

    Opposite direction

  8. negative
    Pretreatment with inhibitors of NOS and nitrate reductase blocked the water stress-induced increase in NO production in maize.

    Nitric Oxide Reduces Hydrogen Peroxide Accumulation Involved in Water Stress‐induced Subcellular Anti‐oxidant Defense in Maize Plants · 2008

    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.