The stated optimum fertilizer application gave the highest maize yield of 9276 kg/ha.

chloride · yield · Zea mays (maize)Results differ

6 papers in the same direction as this claim · 2 in the opposite direction

1. no effect
   Chloride did not increase stover yield.

   Corn Responses to Chloride in Maximum Yield Research · 1995

   Opposite direction

2. negative
   The chloride series yielded less corn than the other anion series.

   Anion Effects on Plant Growth and Anion Composition · 1958 · compared with other series

   Opposite direction

3. positive
   Mepiquat chloride at 200 ppm gave the highest cob length, girth and weight.

   Performance of baby corn (Zea mays L.) as influenced by spacing, nitrogen fertilization and plant growth regulators under sub humid condition in Rajasthan, India · 2013

   Same direction

4. positive
   Broadcasting or mixing chloride with soil tended to alleviate the adverse effects of high row-applied chloride on corn.

   Growth, Maturity, and Yield of Corn as Affected by Chloride in Potassium Fertilizer¹ · 1958 · compared with row fertilization

   Same direction

5. positive
   Mepiquat chloride at 200ppm produced baby corn yield of 2082.64 kg ha-1.

   Response to different levels of spacing, nitrogen and plant growth regulators · 2018

   Same direction

6. positive
   Planting 97.5 thousand plants/hm2 with 675 mL/hm2 chlormequat chloride gave the biggest production of Funong 22 maize, 31 102.5 kg/hm2.

   Study on the Construction of Group Structure and Physiological Index of High-yield Hybrid Seed Production in Spring Maize · 2012 · compared with 7 densities and 3 levels of chemical regulator

   Same direction

7. positive
   cob weight with husk reached 49.84 g under Mepiquat chloride 30ppm along with Zinc sulphate 30 kg/ha.

   Effect of Plant Growth Regulators and Zinc on Growth and Yield of Baby Corn (Zea mays L.) · 2023 · compared with treatment-10 control plot

   Same direction

8. positive
   Mepiquat chloride at 300 ppm gave significantly higher green fodder yield of 494.15 q ha-1.

   Plant Growth Regulators for Forage Yield and Quality Enhancement of Fodder Maize (Zea mays) · 2025

   Same direction

potassium · yield · Zea mays (maize)Positive and negative results

290 papers in the same direction as this claim · 28 in the opposite direction · 1 reporting no difference from an alternative

1. no effect
   Yield was not increased by K application.

   Maize Response to Fertilizer and Nitrogen Use Efficiency in Uganda · 2012

   Opposite direction

2. negative
   Annual blanket N, P and K rates did not produce optimum maize yield under intensive land use.

   Response of maize to nitrogen, phosphorus, and potassium fertilizers in the savanna zones of Nigeria · 1995

   Opposite direction

3. no effect
   Grain yield seldom responded to P and K fertilization.

   Over‐Fertilization Does Not Build Soil Test Phosphorus and Potassium in Ohio · 2018

   Opposite direction

4. no effect
   Nano-N with 75% conventional N gave wheat and maize grain yield at par with full conventional fertilizer.

   Changes in microbial community structure and yield responses with the use of nano-fertilizers of nitrogen and zinc in wheat–maize system · 2024 · compared with N 100 PK

   Opposite direction

5. no effect
   Potassium application did not significantly increase corn yield.

   The Relationships among Corn Yields, Leaf Composition and Fertilizers Applied · 1954

   Opposite direction

6. negative
   Corn yield tended to be lower, by an average of 18.2%, with high K and no B than with low K and no B in 1982 and 1984.

   Potassium, Boron, Nitrogen, and Lime Effects on Corn Yield and Earleaf Nutrient Concentrations¹ · 1987 · compared with low K was added with no B

   Opposite direction

7. no effect
   Potash did not significantly affect corn yield on Tracy soil.

   Magnesium Deficiency and Corn Yield on Two Acid Indiana Soils · 1958

   Opposite direction

8. no effect
   Corn grain yield was unaffected by potassium application at all sites.

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

   Opposite direction

311 papers more in this group

phosphorus · yield · Zea mays (maize)Positive and negative results

548 papers in the same direction as this claim · 69 in the opposite direction · 9 reporting no difference from an alternative

1. no effect
   Phosphorus-based manure or compost application gave corn grain yields similar to N-based treatments.

   Phosphorus‐ and Nitrogen‐Based Manure and Compost Applications Corn Production and Soil Phosphorus · 1999 · compared with N‐based treatments

   Opposite direction

2. no effect
   No effect of P fertilizer on maize yield was detected early in the trial.

   SUSTAINABLE MAIZE PRODUCTION USING GLIRICIDIA/MAIZE INTERCROPPING IN SOUTHERN MALAWI · 2006

   Opposite direction

3. negative
   Lowest phosphorus supply significantly depressed maize shoot dry matter.

   Effect of Selected Mycorrhizal Inoculation on Phosphorus Sustainability in Sterile and Non‐sterile Soils in the Harran Plain in South Anatolia · 2003

   Opposite direction

4. no effect
   plant ha-1 at harvest was not significantly affected by nitrogen and phosphorus levels.

   Effect of Different Levels of Nitrogen and Phosphorus on the Phenology and Yield of Maize Varieties · 2014

   Opposite direction

5. no effect
   Phosphorus had no effect on dry matter yield.

   The Effect of Nitrogen and Phosphorus Fertilization on Growth, Yield and Quality of Forage Maize (Zea mays L.) · 2006

   Opposite direction

6. no effect
   Maize yields did not increase where NP was applied.

   Trends of Yield and Soil Fertility in a Long-Term Wheat-Maize System · 2014

   Opposite direction

7. negative
   Annual blanket N, P and K rates did not produce optimum maize yield under intensive land use.

   Response of maize to nitrogen, phosphorus, and potassium fertilizers in the savanna zones of Nigeria · 1995

   Opposite direction

8. no effect
   Grain yield seldom responded to P and K fertilization.

   Over‐Fertilization Does Not Build Soil Test Phosphorus and Potassium in Ohio · 2018

   Opposite direction

618 papers more in this group