Intervention effectmodel-written summary

Weekly irrigation with split urea gave maximum wheat yields.

A claim from The effect of water and nitrogen on wheat yield on a Zambian soil I. Influence of irrigation schedules and nitrogen piacement · 1985

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Weekly irrigation with split urea gave maximum wheat yields.

Treatment
weekly irrigation and split application of urea at rates of 50 kgN ha‐1 at seeding and minimum 25 kgN ha‐1 topdressed at tilleringe0
Outcome
yieldse0
Direction
Maximume0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier

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

Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Maximum yields were obtained with weekly irrigation and split application of urea at rates of 50 kgN ha‐1 at seeding and minimum 25 kgN ha‐1 topdressed at tillering”

✓ located verbatim in the source · abstract, characters 740–904
t0

“wheat”

✓ located verbatim in the source · title, characters 36–41

Title

The effect of water and nitrogen on wheat yield on a Zambian soil I. Influence of irrigation schedules and nitrogen piacement

K. Munyinda; A. Bunyolo; R.E. Karamanos Communications in Soil Science and Plant Analysis 1985. doi:10.1080/00103628509367585

Other claims from this paper (2)

Record rev-a9674394dcf805a54584f9b550d70348dd8e430ae9c67dd946848c545eb019d8 · schema claims-v0.9 · position 1 in the model’s answer

irrigation · yield · Triticum aestivum (wheat)Positive and negative results

989 papers: 798 positive, 191 negative or no effect

797 papers in the same direction as this claim · 184 in the opposite direction · 7 reporting no difference from an alternative

  1. positive
    Wheat yield increased with irrigation number in normal-rainfall years.

    Influence of Different Levels of Irrigation and Nitrogen on Yield and Nutrient Uptake by Wheat1 · 1979

    Same directionCited by this paper

  2. negative
    Minimum irrigation lowered average winter wheat yield by 14% versus full irrigation.

    Performance of Double‐Cropped Winter Wheat–Summer Maize under Minimum Irrigation in the North China Plain · 2006 · compared with fully irrigated treatment (FI)

    Opposite direction

  3. no effect
    Moderately saline water substituted for good quality water during part of the season maintained total wheat grain yield.

    Time of Salt Stress Affects Growth and Yield Components of Irrigated Wheat · 1994 · compared with good quality water

    Opposite direction

  4. negative
    Saline irrigation caused soil salinization and reduced wheat growth and yield.

    Effect of Straw Biochar on Soil Properties and Wheat Production under Saline Water Irrigation · 2019

    Opposite direction

  5. negative
    Deficit irrigation in salt-affected soil reduced wheat productivity.

    Collaborative Impact of Compost and Beneficial Rhizobacteria on Soil Properties, Physiological Attributes, and Productivity of Wheat Subjected to Deficit Irrigation in Salt Affected Soil · 2022

    Opposite direction

  6. negative
    Wastewater irrigation decreased plant height, leaf area and grain yield in wheat.

    Effect of Wastewater Irrigation on Photosynthesis, Growth, and Anatomical Features of Two Wheat Cultivars (Triticum aestivum L.) · 2020

    Opposite direction

  7. no effect
    An additional 33 mm of irrigation did not increase grain yield.

    Source–sink balance and manipulating sink–source relations of wheat indicate that the yield potential of wheat is sink-limited in high-rainfall zones · 2010

    Opposite direction

  8. no effect
    DI water saving had no effect on wheat yield.

    Yield and water productivity of maize and wheat under deficit and raised bed irrigation practices in Egypt · 2012

    Opposite direction

980 papers more in this group

See all 989 papers →

tillage · yield · Triticum aestivum (wheat)Positive and negative results

1,414 papers: 1,116 positive, 298 negative or no effect

1,115 papers in the same direction as this claim · 257 in the opposite direction · 41 reporting no difference from an alternative

  1. negative
    No N application at tillering stage decreased spikes number per m2 and seeds per spike.

    Wheat yield and grain protein response to nitrogen amount and timing. · 2011

    Opposite direction

  2. negative
    Grain yield under stress during tillering and jointing was 27% lower than under the nonstressed treatment I‐1.

    Winter Wheat Response to Nitrogen and Irrigation · 1988 · compared with nonstressed (I‐1)

    Opposite direction

  3. negative
    NT likely decreased wheat yield.

    The impacts of conservation agriculture on crop yield in China depend on specific practices, crops and cropping regions · 2014

    Opposite direction

  4. no effect
    Tillage treatments had no residual effect on subsequent sunflower and wheat yields.

    Tillage and Residue Effects on Wheat, Sorghum, and Sunflower Grown in Rotation · 1984

    Opposite direction

  5. no effect
    Tillage system had no significant wheat yield effect from 1977 to 2016.

    Long-term effects of crop succession, soil tillage and climate on wheat yield and soil properties · 2019

    Opposite direction

  6. no effect
    Wheat grain yield was unaffected by tillage and cover crop management.

    Crop and cattle responses to tillage systems for integrated crop–livestock production in the Southern Piedmont, USA · 2007

    Opposite direction

  7. negative
    Reduced tillage decreased wheat yield by 14%.

    Tillage effects on weed communities in an organic winter wheat–sunflower–spelt cropping sequence · 2011

    Opposite direction

  8. no effect
    RB had no significant effect on wheat yield.

    Yield and water productivity of maize and wheat under deficit and raised bed irrigation practices in Egypt · 2012

    Opposite direction

1,405 papers more in this group

See all 1,414 papers →

nitrogen · yield · Triticum aestivum (wheat)Positive and negative results

2,061 papers: 1,737 positive, 324 negative or no effect

1,736 papers in the same direction as this claim · 285 in the opposite direction · 39 reporting no difference from an alternative

  1. positive
    Sixty pounds of nitrogen applied at seeding time gave higher wheat yield increases than other rates or times of application.

    Effect of Nitrogen on Growth, Quality, and Yield of Irrigated Wheat in West Pakistan1 · 1957 · compared with other rate or time of application

    Same directionCited by this paper

  2. negative
    The lowest N rates reduced grain number per square metre at any given photothermal quotient.

    The effects of radiation and nitrogen on number of grains in wheat · 1995

    Opposite direction

  3. negative
    Severe drought with low nitrogen reduced grain yields.

    Nitrogen Nutrition Improves the Potential of Wheat (Triticum aestivum L.) to Alleviate the Effects of Drought Stress during Vegetative Growth Periods · 2016

    Opposite direction

  4. negative
    Low nitrogen reduced grain yield to 4.3 t/ha.

    The Effects of Prolonged Drought and Nitrogen Fertilizer on Root and Shoot Growth and Water Uptake by Winter Wheat · 1989 · compared with both N and water

    Opposite direction

  5. negative
    Terminal spikelet production was delayed by about 2 d at these N treatments in Aroona.

    Leaf Emergence, Tiller Growth, and Apical Development of Nitrogen‐Dificient Spring Wheat · 1993

    Opposite direction

  6. no effect
    Nitrogen level, N timing and seeding rate had no significant effect on spring wheat grain yield across environments.

    Seeding Rate and Nitrogen Management Effects on Spring Wheat Yield and Yield Components · 2007

    Opposite direction

  7. no effect
    ear weight changed with two nitrogen treatments.

    Effect of source‐sink relations and nitrogen nutrition on senescence and N remobilization in the flag leaf of wheat · 1991

    Opposite direction

  8. negative
    In some environments, higher nitrogen rates lowered wheat yield.

    Graphic Analysis of Genotype, Environment, Nitrogen Fertilizer, and Their Interactions on Spring Wheat Yield · 2004

    Opposite direction

2,052 papers more in this group

See all 2,061 papers →

3 of 4 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.

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.