Intervention effectmodel-written summary

Phosphorus and potassium fertilization significantly increased cowpea yield.

A claim from INOCULAÇÃO E ADUBAÇÃO MINERAL NA CULTURA DO FEIJÃO - CAUPI EM LATOSSOLOS DA AMAZÔNIA ORIENTAL · 2011

Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Phosphorus and potassium fertilization significantly increased cowpea yield.

Treatment
Fertilization with phosphorus and potassiume0
Outcome
yield of cowpeae0
Direction
increasee0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier

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

Vigna unguiculata
Vigna unguiculata · TaxonHeraldDesa at English Wikipedia · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Fertilization with phosphorus and potassium represented a significant increase in the yield of cowpea”

✓ located verbatim in the source · abstract, characters 717–818

Title

INOCULAÇÃO E ADUBAÇÃO MINERAL NA CULTURA DO FEIJÃO - CAUPI EM LATOSSOLOS DA AMAZÔNIA ORIENTAL

RAIMUNDO THIAGO LIMA DA SILVA; DIEGO DA PAIXÃO ANDRADE; ÉMILE COSTA MELO; et al. DOAJ (DOAJ: Directory of Open Access Journals) 2011

Other claims from this paper (2)

Record rev-e198251ffcfada3aa3b76b5365ebce3a771ce6992045f241ca308a8d0307a529 · schema claims-v0.9 · position 1 in the model’s answer

phosphorus · yield · Vigna unguiculata (cowpea)Results differ

113 papers: 107 positive, 6 negative or no effect

106 papers in the same direction as this claim · 5 in the opposite direction · 1 reporting no difference from an alternative

  1. no effect
    Potassium and phosphorus rates showed no interaction effect on grain yield.

    Liming, fertilization, and rhizobia inoculation on cowpea yield in a Brazilian Amazon upland forest environment · 2021

    Opposite direction

  2. no effect
    Phosphorus level had no significant effect on stem girth, plant height or 100 seed weight.

    Effect of different phosphorus levels on four cowpea (Vigna unguiculata Walp L.) varieties for grain and fodder yield in Upper East Region of Ghana · 2019

    Opposite direction

  3. negative
    Cowpea yield with P was 0.01 Mg/ha, against 0.13 Mg/ha without P, as written.

    Crop Response to Lime and Phosphorus on New Bench Terraces in the Tropics · 1990 · compared with no‐P

    Opposite direction

  4. no effect
    Phosphorus fertilizer and row spacing did not significantly influence grain number per pod.

    Responses of Cowpea to Phosphorous Application Rates and Row Spacing in the Sudan Savanna Zone of Nigeria · 2020

    Opposite direction

  5. no effect
    Phosphorus application had no significant effect on crop yield.

    Effect of density of acacia and phosphorus fertilization on yield and water expense efficiency of rainfed cowpea in arid environment · 2005

    Opposite direction

  6. no effect
    Calcined Burkina phosphate rock (CPR) showed no superiority over non-calcined Burkina phosphate rock (BPR) for grain production.

    Effect of calcined/non-calcined phosphate rock application on crop yield and phosphorus availability to replace commercial fertilizer on a lixisol in Burkina Faso · 2025 · compared with BPR

    No difference from an alternative

  7. positive
    Phosphorus alone consistently increased cowpea grain yield across locations.

    Growth and Yield Responses of Cowpea to Inoculation and Phosphorus Fertilization in Different Environments · 2017

    Same direction

  8. positive
    Applied phosphorus significantly improved pods per plant in cowpea, with the highest response at 60 kg.P.ha–1.

    Influence of phosphorus on the performance of cowpea (Vigna unguiculata (L) Walp.) varieties in the Sudan savanna of Nigeria · 2011

    Same direction

104 papers more in this group

See all 113 papers →

potassium · yield · Vigna unguiculata (cowpea)Positive and negative results

33 papers: 32 positive, 1 negative or no effect

31 papers in the same direction as this claim · 1 in the opposite direction

  1. no effect
    Potassium and phosphorus rates showed no interaction effect on grain yield.

    Liming, fertilization, and rhizobia inoculation on cowpea yield in a Brazilian Amazon upland forest environment · 2021

    Opposite direction

  2. positive
    The inoculant with 30 kg P2O5 and 20 kg K2O gave the highest grain yield on Ferric Lixisol, 1.68 tons ha−1.

    Combined Application of Inoculant, Phosphorus and Potassium Enhances Cowpea Yield in Savanna Soils · 2020 · compared with BR-40-30 kg ha−1 P2O5 and K2O ha−1

    Same direction

  3. positive
    T6 produced significantly higher green matter yield (334.5 q ha-1) in fodder cowpea or postharvest soil.

    Effect of Organic and Inorganic Nutrient Sources on Growth, Yield, Nutrient Uptake and Economics of Fodder Cowpea [Vigna unguiculata (L.) Walp.] · 2020

    Same direction

  4. positive
    Application of 60 kg K2O/ha gave significantly higher grain yield in cowpea.

    Effect of potassium and zinc on yield, protein content and uptake of micronutrients on cowpea [Vigna unguiculata (L.) Walp.]. · 2012

    Same direction

  5. positive
    K application at an economically optimal rate of 17 kg ha-1 gave a yield gain of 0.264 Mg ha-1 in Tanzania.

    Cowpea nutrient responses for Malawi and Tanzania · 2018

    Same direction

  6. positive
    CPE 40 with recommended fertilizer gave maximum growth and yield under plentiful water.

    Response of Summer Cowpea to Growth, Yield and Water Use Efficiency under different Irrigation and Nutrient Management in Lower Indo-Gangetic Plains · 2020

    Same direction

  7. positive
    Potassium up to 129 kg. h-1 significantly increased seeds number pod-1 to 8.76 seed. pod-1 versus control.

    Response of Three Varieties of Cowpea( Vigna sinensis L.) to Different levels of potassium fertilizer under southern region conditions of Iraq · 2019 · compared with control

    Same direction

  8. positive
    The combined amendments increased cowpea vegetative growth traits.

    Effect of Feldspar, Compost and Biochar on Cultivating Cowpea (Vigna unguiculata ssp. unguiculata) Plant and Soil Sandy Clay Loam Properties · 2022

    Same direction

24 papers more in this group

See all 33 papers →

fertilization · yield · Vigna unguiculata (cowpea)Positive and negative results

292 papers: 275 positive, 17 negative or no effect

274 papers in the same direction as this claim · 15 in the opposite direction · 2 reporting no difference from an alternative

  1. no effect
    Baglog compost mixed with cow manure had no significant effect on stem diameter, pod number and pod length.

    Respon Pemberian Campuran Kompos Baglog Dengan Pupuk Kandang Sapi dan Pupuk Organik Cair (POC) Limbah Cair Pabrik Kelapa Sawit Terhadap Pertumbuhan dan Produksi Tanaman Kacang Panjang (Vigna sinensis L.). · 2020

    Opposite direction

  2. negative
    62 Mg ha−1 manure decreased cowpea grain and biomass yield.

    Cattle manure and intercropping effects on soil properties and growth and yield of pearl millet and cowpea in Namibia · 2019

    Opposite direction

  3. no effect
    Phosphorus application had no significant effect on cowpea growth and yield.

    Effect of nitrogen and phosphorus fertilizer application on growth and yield performance of cowpea in Ghana · 2017

    Opposite direction

  4. no effect
    Residual KCl fertilization did not affect cowpea grain yield.

    Sistemas de manejo e efeito residual do potássio na produtividade e nutrição do feijão-caupi · 2014

    Opposite direction

  5. no effect
    Adding fertilizer N to inoculated cowpeas did not increase seed yield.

    Interaction Between Rhizobial Inoculation and Fertilizer Nitrogen in Five Cowpea Cultivars · 1986

    Opposite direction

  6. no effect
    Grain yield did not differ among seven rhizobia inoculations, mineral nitrogen fertilization and controls.

    Strategies for Improving Cowpea Grain Yield in the Eastern Amazon: Biological Nitrogen Fixation, Phosphorus Nutrition, and Molybdenum Seed Enrichment · 2023 · compared with the control (without inoculation and N fertilization)

    Opposite direction

  7. no effect
    Fertilizer treatments did not significantly affect harvest time of cowpeas.

    Effects of Fertilizers on Harvest Time and Yield of Cowpeas (Vigna unguiculata) in Sierra Leone · 1973

    Opposite direction

  8. no effect
    Previous FYM application rate did not significantly affect 100-seed weight of cowpea.

    Response of cowpea [Vigna unguiculata (L) Walp] to residual effect of different application rates of sheep manure on chilli pepper (Capsicum annuum) · 2010

    Opposite direction

283 papers more in this group

See all 292 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.