Intervention effectmodel-written summary

P and K fertilization had a lesser effect on grain nutrients.

A claim from Do soil test levels and fertilization with phosphorus and potassium impact field crop tissue concentrations? · 2020

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

P and K fertilization had a lesser effect on grain nutrients.

Taxon
corn ( Zea mays L.), soybean [ Glycine max (L.) Merr.], and wheat ( Triticum aestivum L.)Glycine maxTriticum aestivumZea mayse1
Treatment
Fertilization of P and Ke0
Outcome
grain P and K concentrationse0
Direction
lessere0
Comparator
leaf tissue concentrationse0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValueQualifier

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

Glycine max
Glycine max · TaxonPublic domain · Wikimedia Commons ↗
Triticum aestivum
Triticum aestivum · TaxonRasbak · CC BY-SA 3.0 · Wikimedia Commons ↗
Zea mays
Zea mays · TaxonAkwugo · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“Fertilization of P and K marginally but consistently increased leaf tissue concentrations in all crops but had a lesser effect on grain P and K concentrations.”

✓ located verbatim in the source · abstract, characters 1065–1224
e1

“corn ( Zea mays L.), soybean [ Glycine max (L.) Merr.], and wheat ( Triticum aestivum L.)”

✓ located verbatim in the source · abstract, characters 510–599

Title

Do soil test levels and fertilization with phosphorus and potassium impact field crop tissue concentrations?

Phoo Pye Zone; Steve W. Culman; Van R. Haden; et al. Agronomy Journal 2020. doi:10.1002/agj2.20243

Other claims from this paper (3)

Record rev-e93ff5c04917d3ce03c8999dfccca56e3ba3b02d109b28a8b90246ece4e7ffa9 · schema claims-v0.9 · position 3 in the model’s answer

potassium · nutrient: content · Zea mays (maize)Results differ

96 papers: 74 positive, 22 negative or no effect

73 papers in the same direction as this claim · 22 in the opposite direction

  1. no effect
    Co-application of P and K with N did not significantly affect nutrient concentration and uptake in corn.

    Nitrogen, Phosphorus, and Potassium Uptake in Rain-Fed Corn as Affected by NPK Fertilization · 2023

    Opposite directionCites this paper

  2. negative
    Higher K rates decreased calcium, magnesium, or phosphorus uptake.

    Nutrient Dilution—Antagonism Effects in Corn and Snap Beans in Relation to Rate and Source of Applied Potassium · 1975

    Opposite directionCited by this paper

  3. no effect
    PNS had no significant effect on seed phosphorus, calcium and sodium concentrations in maize.

    Response of maize (Zea mays L.) to potassium nano-silica application under drought stress · 2020

    Opposite direction

  4. no effect
    Applied K rate had little effect on K uptake patterns in maize parts.

    Nutrient Uptake and Productivity as Affected by Nitrogen and Potassium Application Levels in Maize/Sweet Potato Intercropping System · 2001

    Opposite direction

  5. negative
    total Fe decreased at the highest K dose.

    Effects of potassium and iron on macro element uptake of maize. · 2010

    Opposite direction

  6. negative
    High rates of potassium, enhanced by ploughing in crop-residue ash, seriously reduced maize magnesium status.

    Effects of Fertilizers on Exchangeable Cation Ratios and Crop Nutrition in Northern Nigeria · 1976

    Opposite direction

  7. negative
    Increasing K rate decreased leaf Ca concentration.

    Effects of Nitrogen and Potassium on Growth and Cation Composition of Corn Genotypes Differing in Average Ear Number1 · 1987

    Opposite direction

  8. no effect
    Potassium and nitrapyrin rates did not affect total grain nitrogen.

    Effects of Increasing the Rates of Potassium and Nitrapyrin on Nitrogen Uptake by Corn1 · 1983

    Opposite direction

87 papers more in this group

See all 96 papers →

potassium · nutrient: content · Glycine max (soybean)Positive and negative results

36 papers: 27 positive, 9 negative or no effect

26 papers in the same direction as this claim · 9 in the opposite direction

  1. negative
    Uncouplers, high potassium, and p-chloromercuribenzenesulfonic acid inhibited both translocations.

    Energy-dependent Loading of Amino Acids and Sucrose into the Phloem of Soybean · 1979

    Opposite direction

  2. negative
    At 0.5 mM K, leaf K concentration declined about 54%.

    Potassium Starvation Limits Soybean Growth More than the Photosynthetic Processes across CO2 Levels · 2017 · compared with control

    Opposite direction

  3. no effect
    Potassium use had no significant effect on soybean trifoliate-leaf K concentration.

    Impact of Banded Potassium on Crop Yield and Soil Potassium in Ridge‐Till Planting · 2004

    Opposite direction

  4. negative
    Soybean leaf calcium and magnesium concentrations decreased linearly with increasing K rate.

    Effect of potassium fertilization in sandy soil on the content of essential nutrients in soybean leaves · 2022

    Opposite direction

  5. negative
    Consecutive K2O doses over 90 kg ha−1 reduced soybean leaf Ca and Mg.

    5-year Effects of Potassium Fertilization Levels on Nutrition Balance and Yield in the Maize/Soybean Succession · 2022

    Opposite direction

  6. no effect
    The Ca concentration was unaffected by P and K treatments during the first two years

    Effects of deep placement of limestone and fertility treatments on the chemical composition of soybeans and on certain properties of a Tatum soil · 1974

    Opposite direction

  7. negative
    Potassium deficiency increased nonsoluble sulfur in leaf blades.

    Sulfur composition of soybeans as affected by macronutrient deficiencies · 1972

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

  8. no effect
    Co-inoculation and potassium silicate did not influence potassium and silicon content in soybean straw and grains.

    Microorganism co-inoculation associated with potassium silicate doses on nutrition, production components, and yield of soybean · 2025

    Opposite direction

27 papers more in this group

See all 36 papers →

potassium · nutrient: content · Triticum aestivum (wheat)Positive and negative results

82 papers: 71 positive, 11 negative or no effect

70 papers in the same direction as this claim · 10 in the opposite direction · 1 reporting no difference from an alternative

  1. negative
    Increasing K from 400 to 800 μ M decreased shoot Mg concentration of wheat by 13%.

    Phosphorus and Temperature Effects on Magnesium, Calcium, and Potassium in Wheat and Tall Fescue Leaves · 1994

    Opposite direction

  2. no effect
    Sucrose uptake and efflux were insensitive to metabolic inhibitors, pH, and potassium concentration.

    Sucrose Release into the Endosperm Cavity of Wheat Grains Apparently Occurs by Facilitated Diffusion across the Nucellar Cell Membranes · 1995

    Opposite direction

  3. no effect
    Potassium and phosphorus by potassium interactions had no significant effect on Mn uptake.

    The relationship between phosphorus and copper concentrations in wheat · 1980

    Opposite direction

  4. no effect
    Differentiated P and K rates had no significant effect on nitrogen accumulation at full ripening.

    Effects of different phosphorus and potassium fertilization on contents and uptake of macronutrients (N, P, K, Ca, Mg) in winter wheat I. Content of macronutrients · 2014

    Opposite direction

  5. no effect
    Long-term fertilization had no detectable residual effect on grain K.

    Studying the Direct and Residual Effect of Long‐Term Fertilization Using Ammonium Lactate and Hot Water Extraction Methods · 2005

    Opposite direction

  6. negative
    Limiting potassium decreased nitrogen content of wheat dry matter.

    THE EFFECT OF POTASSIUM SUPPLY ON THE COMPOSITION AND QUALITY OF WHEAT. II · 1935

    Opposite direction

  7. negative
    Low-K stress strongly induced the wheat calcium signaling components CBLs and CIPKs.

    Wheat roots adapt to potassium deficiency through coordinated antioxidant, hormonal, and metabolic reprogramming: Insight from morpho-physiological, biochemical, and transcriptomic analysis · 2025 · compared with sufficient-K control

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

  8. negative
    Potassium gave a negative response in black soil.

    Influence of Cationic Environment on Crop Response to Fertilizers · 1985

    Opposite direction

73 papers more in this group

See all 82 papers →

3 of 9 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.