Foliar zinc, iron, and boron significantly increased maize protein content relative to control.

zinc atom · quality: protein · Zea mays (maize)Results differ

36 papers in the same direction as this claim · 5 in the opposite direction

1. no effect
   Zinc application did not affect calcium and crude protein content.

   Influence of seed rate, nitrogen and zinc on fodder maize (Zea mays) in temperate conditions of western Himalayas · 2001

   Opposite direction

2. negative
   Low zinc caused more maize protein components to disappear.

   Effect of Low Zinc and Zinc Deficiency on Maize Growth · 2003

   Opposite direction

3. no effect
   Low zinc treatment altered the protein and amino acid content of Mudan 9 only a little

   Effect of Zinc on C,N Metabolism of Different Varied Maize (Zea mays L.) Genotype Seedlings · 2010

   Opposite direction

4. no effect
   Zinc did not significantly affect crude protein or acid detergent fiber.

   Influence of Zinc Fortification on Yields and Quality of Fodder Maize · 2019

   Opposite direction

5. no effect
   Zn, Fe and bioinoculant treatments had no significant impact on maize protein content.

   Biofortification of zinc, iron, arbuscular mycorrhiza and Trichoderma on quality parameters and available soil nutrient status in soil of maize · 2024

   Opposite direction

6. positive
   Under zinc deficiency, total protein was significantly reduced in DAC but not PAC.

   Zinc deficiency tolerance in maize is associated with the up‐regulation of Zn transporter genes and antioxidant activities · 2018 · compared with Zn‐sufficient plants

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

7. positive
   Protein content was significantly higher among treatments.

   Effect of different chelated zinc sources on the growth and yield of maize (Zea mays L.) · 2009

   Same direction

8. positive
   Protein content significantly increased with S and Zn over control.

   Effect of sulphur and zinc nutrition on yield and quality of maize in Typic Ustochrept soil of Kanpur · 2002 · compared with control

   Same direction

33 papers more in this group

iron atom · quality: protein · Zea mays (maize)Positive and negative results

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

1. no effect
   Zn, Fe and bioinoculant treatments had no significant impact on maize protein content.

   Biofortification of zinc, iron, arbuscular mycorrhiza and Trichoderma on quality parameters and available soil nutrient status in soil of maize · 2024

   Opposite direction

2. positive
   Fe and biochar increased protein by 64%.

   Improving iron bioavailability and nutritional value of maize (Zea maysL.) in sulfur-treated calcareous soil · 2016 · compared with control

   Same direction

3. positive
   Foliar Zn and Fe nanoparticles significantly improved protein content.

   Synergistic Effect of Iron and Zinc Nanoparticles with Recommended Nitrogen Dose on Production and Grain Quality of Maize (Zea mays L.) Cultivars Under Drought Stress · 2024

   Same direction

4. positive
   crude protein increased under nanopowder treatment.

   The effect of a mixture of iron and nickel nanopowders of various concentrations on the growth and yield of corn · 2022

   Same direction

5. positive
   The S6 nutrient treatment produced crude protein content of 14.65 and 14.93% in maize.

   Production potential of maize under agronomic biofortification · 2022

   Same direction

6. positive
   The N150+P75+K75+S60+Zn50+Fe10+Az treatment gave the highest grain protein quality in maize and wheat, lowest in control.

   Influence of Chemical Fertilizers and Micronutrients on Nutrient Uptake and Quality Parameter under Maize-Wheat Cropping System · 2019 · compared with control treatment

   Same direction

7. positive
   Foliar Fe+Zn+Mn gave among the highest grain protein percentage and growth parameters in corn in both seasons.

   Effect of Foliar Application with Growth Promoters and Mixture of Fe, Zn and Mn on Growth and Yield of Corn under Different Nitrogen levels · 2024

   Same direction

micronutrient · quality: protein · Zea mays (maize)Results agree

5 papers in the same direction as this claim

1. positive
   Micronutrients increased crude protein content of maize varieties.

   Protein Contents of Maize Varieties (QPM and Normal Maize) as Influenced by Nitrogen and Micronutrients · 2017

   Same direction

2. positive
   A 1.0 dolomite dose with mineral fertilizer, sulfur and foliar micronutrient fertilizer produced maximum protein of 10.5%.

   Effect of fertilization and liming on grain maize productivity in thes hort-term crop rotationons oddy-podzolic soil · 2021

   Same direction

3. positive
   Amino acid micronutrient fertilizer significantly increased soluble total sugar and protein of corn compared with the contrast.

   Effects of Amino Acid and Trace Elements Chelated Fertilizer on Maize Yield and Quality · 2015 · compared with contrast

   Same direction

4. positive
   Humic acid at 36 kg ha-1 plus foliar micronutrients gave the highest first-season grain protein content of 205 g kg-1.

   Mutual Effect among Some Organic Substances and Micronutrients on Maize (Zea mays l.) Grown on Sandy Soil · 2015

   Same direction

5. positive
   Foliar feeding increased crude protein content by 0.6...1.0%.

   EFFECT OF LIQUID ORGANIC AND MINERAL FERTILIZERS ON PRODUCTIVITY AND QUALITY OF CORN GREEN MASS · 2025

   Same direction