Intervention effectmodel-written summary

These SPAD 36 treatments did not reduce grain yield relative to fixed-time management.

A claim from Precision nitrogen management using chlorophyll meter for Improving Growth, Productivity and N Use Efficiency of Rice in Subtropical Climate · 2013

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

These SPAD 36 treatments did not reduce grain yield relative to fixed-time management.

Treatment
SPAD 36 with 35 and 25 kg N ha-1 top-dressinge0
Outcome
grain yielde0
Direction
without reducinge0
Comparator
FTNMe0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValueQualifier

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

Oryza sativa
Oryza sativa · Taxon · picture from its Wikimedia Commons categoryDesmanthus4food · CC BY-SA 3.0 us · Wikimedia Commons ↗

Verbatim

e0

“SPAD 36 with 35 and 25 kg N ha-1 top-dressing could save N fertilizer by 20 to 35% compared to FTNM without reducing grain yield”

✓ located verbatim in the source · abstract, characters 843–971
t0

“Rice”

✓ located verbatim in the source · title, characters 113–117

Title

Precision nitrogen management using chlorophyll meter for Improving Growth, Productivity and N Use Efficiency of Rice in Subtropical Climate

Mainak Ghosh; Dillip Kumar Swain; Madan Kumar Jha; et al. Journal of Agricultural Science 2013. doi:10.5539/jas.v5n2p253

Other claims from this paper (5)

Record rev-40dc4f8aecb5f7211209904faf0fddc94af4d75675da4875f1092d2eaab61453 · schema claims-v0.9 · position 5 in the model’s answer

nitrogen · yield · Oryza sativa (rice)Positive and negative results

2,045 papers: 1,803 positive, 242 negative or no effect

1,802 papers in the same direction as this claim · 193 in the opposite direction · 49 reporting no difference from an alternative

  1. no effect
    Applying 30 kg N ha−1 at each SPAD drop below 37.5 gave rice yields equivalent to 120 kg N ha−1 applied in three splits

    Chlorophyll Meter– and Leaf Color Chart–Based Nitrogen Management for Rice and Wheat in Northwestern India · 2002 · compared with 120 kg N ha−1 applied in three splits

    Opposite directionCited by this paper

  2. positive
    SPAD-triggered 90 kg N ha −1 produced rice yields equivalent to the 120 kg N ha −1 split application.

    Chlorophyll Meter– and Leaf Color Chart–Based Nitrogen Management for Rice and Wheat in Northwestern India · 2002 · compared with 120 kg N ha −1 applied in three splits

    Same directionCited by this paper

  3. positive
    The mixed regimes produced 20.2%-33.8% higher grain yield.

    Effect of Integrated Nutrient Management on Growth and Productivity of Hybrid Rice · 2015

    Same directionCites this paper

  4. positive
    Applying 100 or 120N improved panicle number, filled grain and yield under both irrigation regimes.

    Effects of urea types combination with alternate wetting and drying irrigation on rice yield in the Vietnam Mekong Delta · 2024

    Same directionCites this paper

  5. negative
    Green manure and rice straw nitrogen, alone or in combination with inorganic N, gave lower grain yield, agronomic efficiency and apparent nitrogen uptake than a standard split application of prilled urea.

    Long-term Comparison of the Agronomic Efficiency and Residual Benefits of Organic and Inorganic Nitrogen Sources for Tropical Lowland Rice · 1996 · compared with a standard split application of prilled urea

    Opposite direction

  6. negative
    Chaffy grain number and chaffy grain weight per 5 panicles increased significantly with enhancing nitrogen doses.

    Physiological response of rice (Oryza sativaL.) genotypes to elevated nitrogen applied under field conditions · 2014

    Opposite direction

  7. negative
    Excessive nitrogen yielded 2.68–6.31% less than appropriate nitrogen application.

    Excessive Nitrogen Application Leads to Lower Rice Yield and Grain Quality by Inhibiting the Grain Filling of Inferior Grains · 2022 · compared with appropriate nitrogen application (270 kg N ha−1)

    Opposite direction

  8. negative
    SCU reduced rice yield, though not significantly.

    Effects of different types of slow- and controlled-release fertilizers on rice yield · 2021

    Opposite direction

2,036 papers more in this group

See all 2,045 papers →

fertilization · yield · Oryza sativa (rice)Positive and negative results

3,455 papers: 3,183 positive, 272 negative or no effect

3,182 papers in the same direction as this claim · 207 in the opposite direction · 65 reporting no difference from an alternative

  1. positive
    The mixed regimes produced 20.2%-33.8% higher grain yield.

    Effect of Integrated Nutrient Management on Growth and Productivity of Hybrid Rice · 2015

    Same directionCites this paper

  2. no effect
    Current high nitrogen practices do not significantly raise crop yields relative to optimum fertilization.

    Reducing environmental risk by improving N management in intensive Chinese agricultural systems · 2009 · compared with knowledge-based optimum N fertilization

    Opposite direction

  3. no effect
    CRFs had no effect on crop yield.

    Effect of Enhanced Efficiency Fertilizers on Nitrous Oxide Emissions and Crop Yields: A Meta‐analysis · 2016

    Opposite direction

  4. negative
    The authors found fertilizer and irrigation investment had limited effects on rice production.

    Moving toward rice self-sufficiency in sub-Saharan Africa by 2030: Lessons learned from 10 years of the Coalition for African Rice Development · 2021

    Opposite direction

  5. negative
    Green manure and rice straw nitrogen, alone or in combination with inorganic N, gave lower grain yield, agronomic efficiency and apparent nitrogen uptake than a standard split application of prilled urea.

    Long-term Comparison of the Agronomic Efficiency and Residual Benefits of Organic and Inorganic Nitrogen Sources for Tropical Lowland Rice · 1996 · compared with a standard split application of prilled urea

    Opposite direction

  6. negative
    Without P fertilization, rice produced no panicles or grain.

    Nitrogen, Phosphorus and Potassium Interactions in Upland Rice · 2014

    Opposite direction

  7. negative
    Broadcast and split prilled urea left 11 to 35% of applied nitrogen unrecovered at harvest.

    Nitrogen‐15 Balance and Residual Effects of Urea‐N in Wetland Rice Fields as Affected by Deep Placement Techniques · 1984

    Opposite direction

  8. no effect
    Cow dung manure rates did not significantly affect grain yield or greenhouse gas emissions.

    Influence of rice varieties, organic manure and water management on greenhouse gas emissions from paddy rice soils · 2021

    Opposite direction

3,446 papers more in this group

See all 3,455 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.