Intervention effectmodel-written summary

Five-year average corn grain yields after hairy vetch with no N fertilizer were about 2.5 Mg/ha higher than after corn residue or rye cover.

A claim from Nitrogen from Legume Cover Crops for No‐Tillage Corn1 · 1984

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Five-year average corn grain yields after hairy vetch with no N fertilizer were about 2.5 Mg/ha higher than after corn residue or rye cover.

Treatment
hairy vetch cover crop with no N fertilizere0
Outcome
yields of corn graine0
Direction
moree0
Value
2.5 Mg ha −1e0
Comparator
corn residue or rye cover crope0

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

“yields of corn grain following hairy vetch cover crop with no N fertilizer were about 2.5 Mg ha −1 more than corn yields when following corn residue or rye cover crop”

✓ located verbatim in the source · abstract, characters 1284–1450

Title

Nitrogen from Legume Cover Crops for No‐Tillage Corn1

S. A. Ebelhar; W. W. Frye; R. L. Blevins Agronomy Journal 1984. doi:10.2134/agronj1984.00021962007600010014x

Other claims from this paper (7)

Record rev-bca114f2feada5bd24486eab37f2bf22c09bc80a35a7dce755b4edf09a904399 · schema claims-v0.9 · position 6 in the model’s answer

Vicia villosa · yield · Zea mays (maize)Positive and negative results

54 papers: 45 positive, 9 negative or no effect

44 papers in the same direction as this claim · 5 in the opposite direction · 4 reporting no difference from an alternative

  1. positive
    Hairy vetch with 100 kg ha−1 of fertilizer N gave the highest corn grain yields and economic returns.

    Economics of winter cover crops as a source of nitrogen for no-till corn · 1985

    Same directionCites this paper

  2. positive
    No-till corn after a hairy vetch cover crop yielded more than after winter fallow and winter wheat covers at comparable N rates over 3 years.

    Profitability of No‐Tillage Corn following a Hairy Vetch Cover Crop · 1993 · compared with winter fallow and winter wheat cover crops

    Same directionCites this paper

  3. positive
    Incorporating hairy vetch into soil by disking before planting gave corn grain yields equal to or greater than all other treatments.

    Hairy Vetch as a Winter Cover Crop for Dryland Corn Production · 1991 · compared with all other treatments

    Same directionCites this paper

  4. positive
    Corn grain yields were higher following hairy vetch, averaging 11.6 Mg ha-1 versus 9.9 Mg ha-1 following cover crops without hairy vetch.

    Cover crop nitrogen availability to conventional and no‐till corn: Soil mineral nitrogen, corn nitrogen status, and corn yield · 2000 · compared with without hairy vetch

    Same directionCites this paper

  5. positive
    Hairy vetch increased corn yield versus wheat cover.

    Long‐Term Corn Yield Impacted by Cropping Rotations and Bio‐Covers under No‐Tillage · 2016 · compared with wheat

    Same directionCites this paper

  6. positive
    The hairy vetch cover crop enhanced corn grain yields in 1996.

    Integration of cover crops with postemergence herbicides in no-till corn and soybean · 2003

    Same directionCites this paper

  7. positive
    No-till corn after hairy vetch was more profitable than after crimson clover, Austrian peas, wheat or fallow across a wide range of corn, nitrogen, vetch seed and herbicide prices.

    Profitability of legume cover crops in the mid Atlantic region · 1994 · compared with crimson clover, Austrian peas, wheat, or fallow

    Same directionCites this paper

  8. positive
    Hairy vetch preceding corn increased corn grain yield by 14.09% against no cover crop.

    Tillage and legume non‐legume cover cropping effects on corn–soybean production · 2020 · compared with noCC

    Same directionCites this paper

45 papers more in this group

See all 54 papers →

cover crop · yield · Zea mays (maize)Positive and negative results

222 papers: 104 positive, 118 negative or no effect

103 papers in the same direction as this claim · 104 in the opposite direction · 14 reporting no difference from an alternative

  1. no effect
    Cover crops often produced no difference in yield at zero N.

    Precipitation and not cover crop composition influenced corn economic optimal N rate and yield · 2022 · compared with control

    Opposite directionCites this paper

  2. negative
    Cover crops reduced corn yield by 9–26% in 2020.

    Cover crops and irrigation impacts on corn production and economic returns · 2024 · compared with no cover crop

    Opposite directionCites this paper

  3. no effect
    Corn yields did not differ significantly with or without a rye cover crop in straight no-till.

    Rye cover crop management in corn. · 2004 · compared with without a cover crop

    Opposite directionCites this paper

  4. positive
    Winter cover crops have a neutral to positive effect on corn yield.

    Corn yield response to winter cover crops: An updated meta-analysis · 2017 · compared with no cover crop (NC)

    Same directionCites this paper

  5. positive
    Biculture cover crops increased corn yield by 21%.

    Review of Corn Yield Response under Winter Cover Cropping Systems Using Meta‐Analytic Methods · 2005 · compared with no cover

    Same directionCites this paper

  6. positive
    No-till corn after a hairy vetch cover crop yielded more than after winter fallow and winter wheat covers at comparable N rates over 3 years.

    Profitability of No‐Tillage Corn following a Hairy Vetch Cover Crop · 1993 · compared with winter fallow and winter wheat cover crops

    Same directionCites this paper

  7. positive
    Grain yield response to N fertilizer is often greater with a legume cover crop than without one in corn.

    Economically sustainable crop production with legume cover crops and conservation tillage · 1989 · compared with without one

    Same directionCites this paper

  8. positive
    The hairy vetch cover crop enhanced corn grain yields in 1996.

    Integration of cover crops with postemergence herbicides in no-till corn and soybean · 2003

    Same directionCites this paper

213 papers more in this group

See all 222 papers →

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

3,908 papers: 3,485 positive, 423 negative or no effect

3,484 papers in the same direction as this claim · 338 in the opposite direction · 85 reporting no difference from an alternative

  1. positive
    Hairy vetch with 100 kg ha−1 of fertilizer N gave the highest corn grain yields and economic returns.

    Economics of winter cover crops as a source of nitrogen for no-till corn · 1985

    Same directionCites this paper

  2. positive
    Corn after red clover without nitrogen fertilizer yielded similarly to corn without green manure given 125 or 187 lb N/acre.

    Response of Corn Grain Yield to Early and Late Killed Red Clover Green Manure and Subirrigation · 1998 · compared with no green manure and 125 lb N/acre (1993) or 187 lb N/acre (1994) applied

    Same directionCites this paper

  3. positive
    Corn grain yield increased with nitrogen fertilizer.

    Cover Crops Impacts on Louisiana Corn Production and Soil Properties · 2019

    Same directionCites this paper

  4. positive
    PSNT plus manure plus clover cover crop gave similar yield maintenance.

    Clover and Manure Management Strategies for Overcoming the Wheat Residue Antagonism of No-Till Corn · 2009 · compared with no-wheat residue systems

    Same directionCites this paper

  5. negative
    If the V8 sufficiency index was below 90%, in-season nitrogen application did not attain maximum yields.

    Ability for In‐Season Correction of Nitrogen Deficiency in Corn Using Chlorophyll Meters · 1997

    Opposite direction

  6. no effect
    N fertilization did not significantly influence belowground NPP of corn.

    Nitrogen fertilizer effects on soil carbon balances in Midwestern U.S. agricultural systems · 2009

    Opposite direction

  7. negative
    Average grain yield of maize was reduced by 37% at low N (no N fertilizer) compared with high N.

    Improving Nitrogen‐Use Efficiency in European Maize · 2003 · compared with HN

    Opposite direction

  8. no effect
    2 t pm/ha + 30-20-20 kg NPK/ha gave maize biomass and grain yields similar to 4 t pm/ha.

    Poultry manure effect on growth and yield of maize · 2009 · compared with 4 t pm/ha

    Opposite direction

3,899 papers more in this group

See all 3,908 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.