Yield · Populus (poplar)

1. cadmium atomPositive and negative results2 papers: 1 positive, 1 negative or no effect
2. copper atomResults agree2 papers: 2 positive, 0 negative or no effect
3. fertilizationResults differ14 papers: 11 positive, 3 negative or no effect · 2 pairs of papers confirmed to differ
4. co2Positive and negative results12 papers: 11 positive, 1 negative or no effect
5. intercroppingPositive and negative results8 papers: 6 positive, 2 negative or no effect
6. pruningPositive and negative results4 papers: 3 positive, 1 negative or no effect
7. climate sitePositive and negative results2 papers: 1 positive, 1 negative or no effect
8. inoculationResults agree4 papers: 4 positive, 0 negative or no effect
9. irrigationResults agree4 papers: 4 positive, 0 negative or no effect
10. ozoneResults agree4 papers: 0 positive, 4 negative or no effect
11. rotationResults agree4 papers: 4 positive, 0 negative or no effect
12. competitionResults agree2 papers: 0 positive, 2 negative or no effect
13. densityResults agree2 papers: 2 positive, 0 negative or no effect
14. heatResults agree2 papers: 2 positive, 0 negative or no effect
15. pollutionResults agree2 papers: 0 positive, 2 negative or no effect
16. transgenicResults 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.