Intervention effectmodel-written summary

Cu and Zn applications significantly increased maize dry matter, nutrient concentration, uptake and grain yield.

A claim from Effect of Cu AND Zn On Maize (Zea Mays L.) Yield and Nutrient Uptake in Coastal Plain Sand Derived Soils of Southeastern Nigeria · 2014

Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Cu and Zn applications significantly increased maize dry matter, nutrient concentration, uptake and grain yield.

Taxon
Maize (Zea Mays L.)Zea mayst0
Treatment
application of Cu and Zne0
Outcome
maize dry matter production, concentration, uptake and grain yieldse0
Direction
increasede0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier

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

Zea mays
Zea mays · TaxonAkwugo · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

t0

“Maize (Zea Mays L.)”

✓ located verbatim in the source · title, characters 23–42
e0

“The application of Cu and Zn into the soils significantly (P < 0.05) increased maize dry matter production, concentration, uptake and grain yields”

✓ located verbatim in the source · abstract, characters 923–1069

Title

Effect of Cu AND Zn On Maize (Zea Mays L.) Yield and Nutrient Uptake in Coastal Plain Sand Derived Soils of Southeastern Nigeria

Ernest Eteng; D. O. Asawalam; AO Ano http://file.scirp.org/pdf/OJSS_2014071611223173.pdf 2014

Other claims from this paper (3)

Record rev-8b947e6c972c00a43ad72bbdebf020c352e94e7afd2be9ae86946f73754aaa6e · schema claims-v0.9 · position 2 in the model’s answer

copper atom · yield · Zea mays (maize)Results differ

26 papers: 18 positive, 8 negative or no effect

17 papers in the same direction as this claim · 8 in the opposite direction

  1. positive
    Copper significantly increased maize grain yield.

    Maize Yield Response and Nutrient Uptake after Micronutrient Application on a Volcanic Soil · 2006

    Same directionCited by this paper

  2. no effect
    High Cu applications from manure did not adversely affect corn yields.

    Effect of Copper Levels in Swine Manure on Corn and Soil · 1983

    Opposite direction

  3. no effect
    Neither copper source decreased corn yield on the three soils.

    Long‐term effects of copper rich swine manure application on continuous corn production · 1991

    Opposite direction

  4. no effect
    Fifteen years of Cu and Zn sulfate applications did not affect corn grain or silage yields

    Form and Availability of Copper and Zinc in a Rhodic Paleudult Following Long‐Term CuSO4 and ZnSO4 Applications · 1982

    Opposite direction

  5. negative
    Soil copper contamination of 200 to 600 mg kg –1 reduced maize yield.

    Response of maize (Zea mays L.) to soil contamination with copper depending on applied contamination neutralizing substances · 2012

    Opposite direction

  6. negative
    At 150 and 200 mg copper per kg soil, maize shoot yield decreased.

    Phytoextraction with Maize of Soil Contaminated with Copper after Application of Mineral and Organic Amendments · 2020

    Opposite direction

  7. negative
    Copper treatments somewhat reduced corn yields

    Availability of Zinc, Copper and Iron in Fusions with Sulfur1 · 1969

    Opposite direction

  8. negative
    Copper had the second greatest yield decrease after nickel.

    Biochar as a Stimulator of Zea mays Growth and Enzyme Activity in Soil Contaminated with Zinc, Copper, and Nickel · 2025 · compared with Nickel

    Opposite direction

17 papers more in this group

See all 26 papers →

zinc atom · yield · Zea mays (maize)Results differ

441 papers: 391 positive, 50 negative or no effect

390 papers in the same direction as this claim · 47 in the opposite direction · 3 reporting no difference from an alternative

  1. positive
    FHY-421 grain yield was maximal at 18 kg Zn ha -1.

    Zinc Partitioning in Maize Grain after Soil Fertilization with Zinc Sulfate · 2010

    Same directionCited by this paper

  2. positive
    Zinc addition increased maize yield in many soils.

    Response of maize (Zea Mays L.) to zinc fertilization in relation to Mehlich 1 extractable zinc in Northern Nigeria · 2006

    Same directionCited by this paper

  3. positive
    Foliar application of Zn increased maize productivity.

    Productivity of maize by leaf application of zinc (Zn) and copper (Cu) · 2017

    Same directionCites this paper

  4. negative
    Adding Zn to the intermediate Fe level accentuated Fe deficiency and depressed corn yield.

    Nutrient Balance Involving Phosphorus, Iron, and Zinc · 1965 · compared with intermediate Fe level

    Opposite direction

  5. negative
    Corn yield at zero zinc and 3.0 mM phosphorus was significantly lower than at 1.0 mM phosphorus.

    Potential for Phosphorus Toxicity in Zinc‐Stressed Corn and Potato · 1981 · compared with 1.0 m M P

    Opposite direction

  6. no effect
    Most foliar Zn applications had no grain-yield effect.

    Effect of Foliar Micronutrients (B, Mn, Fe, Zn) on Maize Grain Yield, Micronutrient Recovery, Uptake, and Partitioning · 2021

    Opposite direction

  7. negative
    In a pot experiment the highest Zn rate (250 ppm) slightly reduced corn yield.

    EFFECTS OF SOIL PROPERTIES AND AMENDMENTS ON THE AVAILABILITY OF ZINC IN SOILS · 1974

    Opposite direction

  8. negative
    Zn alone or P alone reduced aboveground dry matter and yield at harvest by 8-85% in LCV and FER soils relative to unfertilized plants

    Combining P and Zn fertilization to enhance yield and grain quality in maize grown on Mediterranean soils · 2021 · compared with unfertilized (control) plants

    Opposite direction

432 papers more in this group

See all 441 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.