Intervention effectmodel-written summary

The 75% RDN plus nano urea treatment gave the most productive dry matter production.

A claim from Effect of nano urea on the growth and yield of rice (Oryza sativa) under SRI in the Cauvery delta zone of Tamil Nadu · 2023

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

The 75% RDN plus nano urea treatment gave the most productive dry matter production.

Treatment
75% RDN+Nanourea (2 foliar sprays)+P+Ke0
Outcome
dry matter productione0
Direction
most productivee0
Value
3.2, 7.2, 13.2 t/hae0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingQualifier

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

“application of 75% RDN+Nanourea (2 foliar sprays)+P+K found to be most productive in terms of plant height (32.1, 65.7, 83.6 cm), leaf area index (5.10), dry matter production (3.2, 7.2, 13.2 t/ha)”

✓ located verbatim in the source · abstract, characters 1083–1280
t0

“rice”

✓ located verbatim in the source · title, characters 47–51

Title

Effect of nano urea on the growth and yield of rice (Oryza sativa) under SRI in the Cauvery delta zone of Tamil Nadu

G. BHARGAVI; A. SUNDARI Crop Research 2023. doi:10.31830/2454-1761.2023.cr-885

Other claims from this paper (6)

Record rev-5920ea87cdb337ea9da72bc9109d2f90f45e9c1fc5b54b79c3a43e457e4c1e59 · schema claims-v0.9 · position 3 in the model’s answer

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

202 papers: 189 positive, 13 negative or no effect

188 papers in the same direction as this claim · 11 in the opposite direction · 2 reporting no difference from an alternative

  1. positive
    The integrated treatment gave rice 457 panicles per m2, the highest among treatments.

    Integrated rice farming systems for improved growth, yield and pest reduction · 2024

    Same directionCites this paper

  2. positive
    100% conventional N through urea + two foliar sprays of 0.4% nano urea raised tillers/hill versus other treatments.

    Enhancing production, profitability and soil health with nano urea fertilization in late transplanted rice (Oryza sativa L.) · 2025 · compared with other treatments

    Same directionCites this paper

  3. positive
    Seventy-five percent recommended nitrogen plus 25% nano-urea at vegetative stage yielded 4.16 t ha-1, statistically comparable with full nitrogen.

    Comparative effects of urea and nano-urea on growth and yield performance of transplanted rice in the inner Terai Region of Nepal · 2025 · compared with 100% RDN

    Same directionCites this paper

  4. negative
    CeO 2 NPs reduced rice grain yield by 16.2% under heat waves.

    Heat Waves Coupled with Nanoparticles Induce Yield and Nutritional Losses in Rice by Regulating Stomatal Closure · 2024

    Opposite direction

  5. no effect
    With Sesbania, 0.2% nano ZnO-coated urea gave statistically equivalent yield and micronutrient loading in edible tissues.

    Interplay between nano zinc oxide-coated urea and summer green manuring in basmati rice under basmati rice-wheat cropping system: implications on yield response, nutrient acquisition and grain fortification · 2023

    Opposite direction

  6. negative
    65 kg ha –1 plus nano urea foliar sprays reduced rice grain yield by 9.4 %.

    Relative performance of granulated and nano urea on productivity and nitrogen use efficiency of wheat–rice sequence · 2024

    Opposite direction

  7. no effect
    Nano Fe2O3 did not significantly improve grain or straw yield.

    Influence of iron nanoparticles on rice (Oryza sativa) plant growth and yields · 2023

    Opposite direction

  8. negative
    NP-treated urea reduced rice yield by 5.6% against untreated urea in 2014.

    Rice Grain Yield and Nitrogen Uptake as Affected by Urea Amendment and Rainfall Timing · 2017 · compared with untreated urea

    Opposite direction

193 papers more in this group

See all 202 papers →

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

383 papers: 344 positive, 39 negative or no effect

343 papers in the same direction as this claim · 34 in the opposite direction · 5 reporting no difference from an alternative

  1. no effect
    Following green manure, reduced P, K, S and Zn doses did not reduce T. Aman yield.

    Long‐Term Integrated Nutrient Management for Rice‐Based Cropping Pattern: Effect on Growth, Yield, Nutrient Uptake, Nutrient Balance Sheet, and Soil Fertility · 2007

    Opposite direction

  2. negative
    Low K (3 mg/kg) decreased allelochemical production in rice.

    Nutritional Stresses and Varietal Resistance in Rice: Effects on Whitebacked Planthopper · 1991

    Opposite direction

  3. no effect
    K application did not increase mean rice yield.

    Upland rice response to nutrient application in Uganda · 2014

    Opposite direction

  4. negative
    Without K application, upland rice dry weight and yield were lower than with K application.

    Fate of basal N and growth of crops cultivated under cassava-based intercropping system with reference to K application rate · 2002 · compared with without K application

    Opposite directionAbout lacking this nutrient, so it counts the other way round

  5. negative
    Higher pyrites with adequate NPK but without Zn did not give yields equal to those from adding 11 kg Zn/ha.

    Effect of sedimentary pyrites and Zn application on yield, Zn and Ca nutrition of rice and wheat crops and on amelioration of saline sodic soil · 1982 · compared with adding 11 kg Zn/ha

    Opposite direction

  6. no effect
    Combined fertilizer application had no significant effect on four processing traits in Neda.

    Effects of Nitrogen and Potassium Fertilizers on Rice (Oryza sativa L.) Genotypes Processing Characteristics · 2007

    Opposite direction

  7. no effect
    Phosphorus and potassium did not affect rice yields in most years.

    Long Term Effects of Organic and Inorganic Fertilizers on Rice under Rice-Wheat Cropping Sequence · 1970

    Opposite direction

  8. negative
    After three cropping years, potassium omission significantly reduced rice grain yield.

    Effect of nutrient omission on rice yield in a wetland double rice cropping system · 2022

    Opposite direction

374 papers more in this group

See all 383 papers →

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

475 papers: 419 positive, 56 negative or no effect

418 papers in the same direction as this claim · 46 in the opposite direction · 10 reporting no difference from an alternative

  1. negative
    The improved line exceeded Nipponbare in grain yield by 250% under P deficiency.

    Genotypic variation for tolerance to phosphorus deficiency in rice and the potential for its exploitation in rice improvement · 2001 · compared with ‘Nipponbare’

    Opposite directionAbout lacking this nutrient, so it counts the other way round

  2. no effect
    Combined nitrogen, phosphorus, and sulfur deficiencies had no additive synergistic effect on strigolactone production.

    Upregulation of DWARF27 is associated with increased strigolactone levels under sulfur deficiency in rice · 2018

    Opposite direction

  3. no effect
    Following green manure, reduced P, K, S and Zn doses did not reduce T. Aman yield.

    Long‐Term Integrated Nutrient Management for Rice‐Based Cropping Pattern: Effect on Growth, Yield, Nutrient Uptake, Nutrient Balance Sheet, and Soil Fertility · 2007

    Opposite direction

  4. negative
    Low phosphorus affected grain yield and productive tillers more than water limitation.

    Genotype × Environment interactions of Nagina22 rice mutants for yield traits under low phosphorus, water limited and normal irrigated conditions · 2018 · compared with water limited condition

    Opposite direction

  5. negative
    Imbalanced N, P and K fertilization reduced rice yield.

    Effects of long-term rice straw returning on the fertility and productivity of purplish paddy soil · 2005

    Opposite direction

  6. negative
    Phased application of 50% P reduced the yield of only sesame and wheat crops compared with 100% recommended P dose applied to rabi crop only.

    Effect of integrated nutrient management on nutrient uptake and yield of component crops in rice (Oryza sativa)-based cropping systems · 2001 · compared with 100% recommended dose of P

    Opposite direction

  7. no effect
    Average rice yield did not respond to P.

    Phosphate Rock Fertilization in Tilled and No‐Till Low‐Input Systems in the Humid Tropics · 1988

    Opposite direction

  8. no effect
    Split phosphorus application did not significantly increase rice grain yield.

    ENHANCING WATER AND FERTILIZER SAVING WITHOUT COMPROMISING RICE YIELD THROUGH INTEGRATED CROP MANAGEMENT · 2013

    Opposite direction

466 papers more in this group

See all 475 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.