- fertilizationPositive and negative results5 papers: 3 positive, 2 negative or no effect
- inoculationPositive and negative results3 papers: 2 positive, 1 negative or no effect
- cover cropPositive and negative results2 papers: 1 positive, 1 negative or no effect
- cultivation systemPositive and negative results2 papers: 1 positive, 1 negative or no effect
- nitrogenPositive and negative results2 papers: 1 positive, 1 negative or no effect
- limeResults agree2 papers: 0 positive, 2 negative or no effect
- organicResults agree2 papers: 0 positive, 2 negative or no effect
- rotationResults agree2 papers: 2 positive, 0 negative or no effect
- tillageResults agree2 papers: 2 positive, 0 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.