Intervention effectmodel-written summary

combined Ca+Mg+Zn+B+S produced a positive NDVI response of 15%.

A claim from Prediction of Maize Yields from In-Season GreenSeeker Normalized Difference Vegetation Index and Dry Biomass as Influenced by Different Nutrient Combinations · 2020

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Taxon: MaizeZea mayst0
Treatment: combined Ca+Mg+Zn+B+Se0
Outcome: NDVI responsese0
Direction: Positivee0
Value: 15%e0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingQualifier

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

*Zea mays* · TaxonAkwugo · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

t0
“Prediction of Maize Yields from In-Season GreenSeeker Normalized Difference Vegetation Index and Dry Biomass as Influenced by Different Nutrient Combinations”
✓ located verbatim in the source · title, characters 0–157

e0
“Positive NDVI responses of 56%, 14%, 15%, and 15% were recorded with N, P, K, and combined Ca+Mg+Zn+B+S, respectively.”
✓ located verbatim in the source · abstract, characters 709–827

Title

Prediction of Maize Yields from In-Season GreenSeeker Normalized Difference Vegetation Index and Dry Biomass as Influenced by Different Nutrient Combinations

Hillary M. O. Otieno; George N. Chemining’wa; Shamie Zingore Journal of Agricultural Science 2020. doi:10.5539/jas.v13n1p165

Other claims from this paper (19)

Intervention effect P+K gave the lowest NDVI reading.
Intervention effect N+P+K+Ca+Mg+Zn+B+S gave the highest NDVI reading.
Intervention effect P+K gave the lowest dry biomass.
Intervention effect N+P+K+Ca+Mg+Zn+B+S gave the highest dry biomass.
Intervention effect P+K gave the lowest grain yields.
Intervention effect N+P+K+Ca+Mg+Zn+B+S gave the highest grain yields.
Intervention effect N produced a positive NDVI response of 56%.
Intervention effect P produced a positive NDVI response of 14%.
Intervention effect K produced a positive NDVI response of 15%.
Intervention effect N produced a positive biomass response of 54%.
Intervention effect P produced a positive biomass response of 20%.
Intervention effect K produced a positive biomass response of 8%.
Intervention effect Ca+Mg+Zn+B+S produced a positive biomass response of 18%.
Method / resource GreenSeeker NDVI reading predicted grain yield in Embu with R2 0.23-0.53.
Method / resource aboveground dry biomass predicted grain yield in Embu with R2 0.30-0.61.
Method / resource GreenSeeker NDVI reading predicted grain yield in Kirinyaga with R2 0.31-0.64.
Method / resource aboveground dry biomass predicted grain yield in Kirinyaga with R2 0.30-0.50.
Method / resource Pooled data increased NDVI prediction strength to 67%.
Method / resource Pooled data increased biomass prediction strength to 58%.

Record rev-28b874c28b4e1e0a3d9d0bdf08bfd9889d67ce06f3912899306dab6438e1278e · schema claims-v0.9 · position 10 in the model’s answer

magnesium atom · growth · Zea mays (maize)Results differ

21 papers: 15 positive, 6 negative or no effect

14 papers in the same direction as this claim · 6 in the opposite direction

no effect
Exchangeable Ca/Mg ratios did not substantially affect corn root and shoot growth.
GYPSUM AMENDMENT AND EXCHANGEABLE CALCIUM AND MAGNESIUM EFFECTS ON PLANT NUTRITION UNDER CONDITIONS OF INTENSIVE NUTRIENT EXTRACTION · 2008
Opposite direction
no effect
Magnesium dose did not significantly differentiate maize early absolute growth rate.
Effects of application of different nitrogen fertilizer forms and magnesium on dynamics of dry matter accumulation in two maize (Zea mays L.) hybrids in their early growth stages · 2019
Opposite direction
negative
Mg(HCO3)2 at EC 1 reduced corn top growth by 45% more than mixed salts.
Effect of excess MgSO₄ or Mg(HCO₃)₂in irrigation water on corn growth · 1991 · compared with mixed salt solutions
Opposite direction
negative
High soil magnesium inhibited maize seedling growth above the stated threshold.
Inhibition of high Mg concentration on seedling growth,free radical metabolism of reactive oxygen and zinc nutrition of maize in saline fluvo-aquic soils · 2015
Opposite direction
no effect
Magnesium fertilisation sources did not interfere with maize development.
Magnesium Sources and Inoculation with Azospirillum brasilense in the Initial Development of Maize · 2019 · compared with control without Mg fertilization
Opposite direction
no effect
Omission of calcium, potassium, and magnesium had little impact on development.
Nutrient Omission in Corn Plant Development Cultivated in Nutrient Solution · 2025
Opposite direction
positive
Magnesium at 7.2 meq/L alone gave better effects on root and shoot dry and fresh weight.
Influence of mycorrhizal fungi on growth, chlorophyll content, and potassium and magnesium uptake in maize · 2017
Same direction
positive
Magnesium addition significantly improved maize growth.
Magnesium Fertilizer-Induced Increase of Symbiotic Microorganisms Improves Forage Growth and Quality · 2017
Same direction

12 papers more in this group

See all 21 papers →

calcium atom · growth · Zea mays (maize)Results differ

33 papers: 25 positive, 8 negative or no effect

24 papers in the same direction as this claim · 8 in the opposite direction

negative
Maize root elongation was inhibited under NaCl with added calcium.
Hardening of root cell walls: a growth inhibitory response to salinity stress · 1994
Opposite direction
no effect
Exchangeable Ca/Mg ratios did not substantially affect corn root and shoot growth.
GYPSUM AMENDMENT AND EXCHANGEABLE CALCIUM AND MAGNESIUM EFFECTS ON PLANT NUTRITION UNDER CONDITIONS OF INTENSIVE NUTRIENT EXTRACTION · 2008
Opposite direction
no effect
Calcium level did not change corn pollen germination initiation time.
THE MALE GAMETOPHYTE OF ZEA MAYS L.: III. THE INFLUENCE OF TEMPERATURE AND CALCIUM ON POLLEN GERMINATION AND TUBE GROWTH · 1967
Opposite direction
negative
High calcium stress reduced biomass accumulation and carbon assimilation.
Effects of arbuscular mycorrhizal fungi on carbon assimilation and ecological stoichiometry of maize under combined abiotic stresses · 2024
Opposite direction
no effect
On average, growth under calcium phosphate and triple superphosphate was similar.
Low phosphorus availability in West African moist savanna soils: effect of sparing soluble P sources on the growth of soybean, cowpea and maize · 2005 · compared with TSP
Opposite direction
negative
Drought, high calcium and combined stress reduced maize seedling biomass relative to control without inoculation.
Effect of AMF on the photosynthetic characteristics and growth of maize seedlings under the stress of drought,high calcium and their combination in Karst area · 2015 · compared with control
Opposite direction
negative
Ca(NO3)2 had a more negative impact on seed germination than NaNO3
Impact Of Physiological Alkaline Salts On The Swelling And Germination of Seeds · 2016 · compared with NaNO3
Opposite direction
no effect
Omission of calcium, potassium, and magnesium had little impact on development.
Nutrient Omission in Corn Plant Development Cultivated in Nutrient Solution · 2025
Opposite directionAbout lacking this nutrient, so it counts the other way round

24 papers more in this group

See all 33 papers →

zinc atom · growth · Zea mays (maize)Results differ

224 papers: 183 positive, 41 negative or no effect

182 papers in the same direction as this claim · 41 in the opposite direction

no effect
Zinc deficiency did not affect the pool size of plastoquinone molecules in maize leaves.
Photosynthetic rate, chlorophyll fluorescence parameters, and lipid peroxidation of maize leaves as affected by zinc deficiency · 2005
Opposite directionAbout lacking this nutrient, so it counts the other way round
no effect
Increasing zinc dose did not further increase maize dry matter.
Mobility and Availability to Plants of Two Zinc Sources Applied to a Calcareous Soil · 2003
Opposite direction
negative
Zinc fertilization decreased total maize dry matter mass.
Effect of P and Zn fertilization on biomass yield and its uptake by maize lines (Zea mays L.) · 2003 · compared with control
Opposite direction
negative
High zinc greatly reduced corn root fresh weight.
Zinc, Iron, and Chlorophyll Metabolism in Zinc-toxic Corn · 1977
Opposite direction
no effect
Combined tryptophan and zinc had no additive growth effect.
Stimulation of Growth in Zinc‐Deficient Corn Seedlings by the Addition of Tryptophan¹ · 1970
Opposite direction
no effect
Phosphorus and zinc foliar spray had no effect on dry matter yield of forage maize.
The effects of a foliar spray containing phosphorus and zinc on the development, composition and yield of forage maize · 2001
Opposite direction
negative
Zinc inhibited germination with concentration dependent effects.
Effect of Copper, Zinc and Lead and Their Combinations on the Germination Capacity of Two Cereals · 2004
Opposite direction
negative
Maize growth under both Fe and Zn deficiency was significantly higher than under Fe deficiency alone.
Iron deficiency causes zinc excess inZea mays · 2009 · compared with only Fe-deficient conditions
Opposite directionAbout lacking this nutrient, so it counts the other way round

215 papers more in this group

See all 224 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.

Other papers on the same question

magnesium atom · growth · Zea mays (maize)Results differ

calcium atom · growth · Zea mays (maize)Results differ

zinc atom · growth · Zea mays (maize)Results differ