- zinc atomPositive and negative results16 papers: 14 positive, 2 negative or no effect
- RhizobiumPositive and negative results8 papers: 7 positive, 1 negative or no effect
- cadmium atomPositive and negative results4 papers: 2 positive, 2 negative or no effect
- cobalt atomPositive and negative results3 papers: 2 positive, 1 negative or no effect
- copper atomPositive and negative results3 papers: 2 positive, 1 negative or no effect
- jasmonic acidPositive and negative results3 papers: 2 positive, 1 negative or no effect
- magnesium atomPositive and negative results3 papers: 2 positive, 1 negative or no effect
- nickel atomPositive and negative results3 papers: 1 positive, 2 negative or no effect
- Bradyrhizobium japonicumPositive and negative results2 papers: 1 positive, 1 negative or no effect
- Zea maysPositive and negative results2 papers: 1 positive, 1 negative or no effect
- Zea mays subsp. maysPositive and negative results2 papers: 1 positive, 1 negative or no effect
- fertilizationPositive and negative results134 papers: 116 positive, 18 negative or no effect
- applicationPositive and negative results52 papers: 49 positive, 3 negative or no effect
- densityPositive and negative results20 papers: 10 positive, 10 negative or no effect
- seed treatmentPositive and negative results18 papers: 17 positive, 1 negative or no effect
- sowing timePositive and negative results16 papers: 7 positive, 9 negative or no effect
- otherPositive and negative results13 papers: 11 positive, 2 negative or no effect
- processingPositive and negative results13 papers: 10 positive, 3 negative or no effect
- intercroppingPositive and negative results12 papers: 10 positive, 2 negative or no effect
- tillagePositive and negative results12 papers: 9 positive, 3 negative or no effect
- potassiumPositive and negative results10 papers: 7 positive, 3 negative or no effect
- stagePositive and negative results10 papers: 6 positive, 4 negative or no effect
- limePositive and negative results9 papers: 7 positive, 2 negative or no effect
- transgenicPositive and negative results9 papers: 7 positive, 2 negative or no effect
- lightPositive and negative results8 papers: 4 positive, 4 negative or no effect
- loss of functionPositive and negative results8 papers: 4 positive, 4 negative or no effect
- storagePositive and negative results8 papers: 3 positive, 5 negative or no effect
- classPositive and negative results7 papers: 6 positive, 1 negative or no effect
- heatPositive and negative results7 papers: 3 positive, 4 negative or no effect
- rotationPositive and negative results7 papers: 5 positive, 2 negative or no effect
- biocharPositive and negative results6 papers: 4 positive, 2 negative or no effect
- climate sitePositive and negative results4 papers: 3 positive, 1 negative or no effect
- cultivation systemPositive and negative results3 papers: 2 positive, 1 negative or no effect
- mechanicalPositive and negative results3 papers: 2 positive, 1 negative or no effect
- radiationPositive and negative results3 papers: 2 positive, 1 negative or no effect
- soil waterPositive and negative results3 papers: 2 positive, 1 negative or no effect
- phPositive and negative results2 papers: 1 positive, 1 negative or no effect
- propertyPositive and negative results2 papers: 1 positive, 1 negative or no effect
Claims are grouped by organism, treatment and what was measured or targeted. Claims that compare genotypes are left out; a claim about lacking a nutrient counts the other way round in that nutrient’s question. “Results differ” marks a question where two model reviewers, reading both claims, accepted at least one pair of papers whose results differ.