Soil: chemistry · Helianthus annuus (common sunflower)

1. fertilizationPositive and negative results16 papers: 15 positive, 1 negative or no effect
2. nitrogenPositive and negative results6 papers: 4 positive, 2 negative or no effect
3. biocharPositive and negative results4 papers: 2 positive, 2 negative or no effect
4. organicPositive and negative results4 papers: 3 positive, 1 negative or no effect
5. limeResults agree6 papers: 6 positive, 0 negative or no effect
6. irrigationResults agree5 papers: 5 positive, 0 negative or no effect
7. inoculationResults agree3 papers: 3 positive, 0 negative or no effect
8. otherResults agree3 papers: 3 positive, 0 negative or no effect
9. phosphorusResults 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.