Yield · Spinacia oleracea (spinach)

1. copper atomResults differ2 papers: 1 positive, 1 negative or no effect · 1 pair of papers confirmed to differ
2. iron atomPositive and negative results8 papers: 7 positive, 1 negative or no effect
3. zinc atomPositive and negative results7 papers: 5 positive, 2 negative or no effect
4. manganese atomPositive and negative results4 papers: 1 positive, 3 negative or no effect
5. ammonium sulfatePositive and negative results3 papers: 2 positive, 1 negative or no effect
6. calcium nitratePositive and negative results3 papers: 2 positive, 1 negative or no effect
7. nickel atomPositive and negative results3 papers: 1 positive, 2 negative or no effect
8. sodium chloridePositive and negative results3 papers: 1 positive, 2 negative or no effect
9. ammonium nitratePositive and negative results2 papers: 1 positive, 1 negative or no effect
10. selenium atomPositive and negative results2 papers: 1 positive, 1 negative or no effect
11. cadmium atomResults agree6 papers: 0 positive, 6 negative or no effect
12. AzotobacterResults agree3 papers: 3 positive, 0 negative or no effect
13. diiodineResults agree3 papers: 0 positive, 3 negative or no effect
14. 5-aminolevulinic acidResults agree2 papers: 2 positive, 0 negative or no effect
15. Gibberellic acidResults agree2 papers: 2 positive, 0 negative or no effect
16. lead atomResults agree2 papers: 0 positive, 2 negative or no effect
17. molybdenum atomResults agree2 papers: 2 positive, 0 negative or no effect
18. potassium sulfateResults agree2 papers: 0 positive, 2 negative or no effect
19. prolineResults agree2 papers: 2 positive, 0 negative or no effect
20. fertilizationResults differ79 papers: 68 positive, 11 negative or no effect · 1 pair of papers confirmed to differ
21. nitrogenResults differ43 papers: 38 positive, 5 negative or no effect · 4 pairs of papers confirmed to differ
22. inoculationPositive and negative results15 papers: 14 positive, 1 negative or no effect
23. irrigationPositive and negative results13 papers: 7 positive, 6 negative or no effect
24. applicationPositive and negative results11 papers: 8 positive, 3 negative or no effect
25. biocharPositive and negative results9 papers: 8 positive, 1 negative or no effect
26. organicPositive and negative results9 papers: 7 positive, 2 negative or no effect
27. growing mediumPositive and negative results8 papers: 4 positive, 4 negative or no effect
28. sowing timePositive and negative results8 papers: 4 positive, 4 negative or no effect
29. cultivation systemPositive and negative results4 papers: 3 positive, 1 negative or no effect
30. densityPositive and negative results4 papers: 3 positive, 1 negative or no effect
31. lightPositive and negative results4 papers: 3 positive, 1 negative or no effect
32. in vitroPositive and negative results3 papers: 1 positive, 2 negative or no effect
33. intercroppingPositive and negative results3 papers: 2 positive, 1 negative or no effect
34. transplantingPositive and negative results3 papers: 1 positive, 2 negative or no effect
35. coldPositive and negative results2 papers: 1 positive, 1 negative or no effect
36. heatPositive and negative results2 papers: 1 positive, 1 negative or no effect
37. processingPositive and negative results2 papers: 1 positive, 1 negative or no effect
38. otherResults agree8 papers: 8 positive, 0 negative or no effect
39. salinityResults agree5 papers: 0 positive, 5 negative or no effect
40. botanicalResults agree4 papers: 4 positive, 0 negative or no effect
41. mulchingResults agree4 papers: 4 positive, 0 negative or no effect
42. herbicideResults agree3 papers: 3 positive, 0 negative or no effect
43. potassiumResults agree3 papers: 3 positive, 0 negative or no effect
44. droughtResults agree2 papers: 0 positive, 2 negative or no effect
45. limeResults agree2 papers: 2 positive, 0 negative or no effect
46. nanoparticleResults agree2 papers: 2 positive, 0 negative or no effect
47. phosphorusResults agree2 papers: 2 positive, 0 negative or no effect
48. pruningResults agree2 papers: 2 positive, 0 negative or no effect
49. radiationResults agree2 papers: 2 positive, 0 negative or no effect
50. rotationResults 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.